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<p align="center">
<img src="https://i.imgur.com/J0jv1Sz.png" width="240" height="240" alt="critters">
<h1 align="center">Critters</h1>
</p>
> Critters is a plugin that inlines your app's [critical CSS] and lazy-loads the rest.
## critters [![npm](https://img.shields.io/npm/v/critters.svg)](https://www.npmjs.org/package/critters)
It's a little different from [other options](#similar-libraries), because it **doesn't use a headless browser** to render content. This tradeoff allows Critters to be very **fast and lightweight**. It also means Critters inlines all CSS rules used by your document, rather than only those needed for above-the-fold content. For alternatives, see [Similar Libraries](#similar-libraries).
Critters' design makes it a good fit when inlining critical CSS for prerendered/SSR'd Single Page Applications. It was developed to be an excellent compliment to [prerender-loader](https://github.com/GoogleChromeLabs/prerender-loader), combining to dramatically improve first paint time for most Single Page Applications.
## Features
- Fast - no browser, few dependencies
- Integrates with Webpack [critters-webpack-plugin]
- Supports preloading and/or inlining critical fonts
- Prunes unused CSS keyframes and media queries
- Removes inlined CSS rules from lazy-loaded stylesheets
## Installation
First, install Critters as a development dependency:
```sh
npm i -D critters
```
or
```sh
yarn add -D critters
```
## Simple Example
```js
import Critters from 'critters';
const critters = new Critters({
// optional configuration (see below)
});
const html = `
<style>
.red { color: red }
.blue { color: blue }
</style>
<div class="blue">I'm Blue</div>
`;
const inlined = await critters.process(html);
console.log(inlined);
// "<style>.blue{color:blue}</style><div class=\"blue\">I'm Blue</div>"
```
## Usage with webpack
Critters is also available as a Webpack plugin called [critters-webpack-plugin](https://www.npmjs.org/package/critters-webpack-plugin). [![npm](https://img.shields.io/npm/v/critters-webpack-plugin.svg)](https://www.npmjs.org/package/critters-webpack-plugin)
The Webpack plugin supports the same configuration options as the main `critters` package:
```diff
// webpack.config.js
+const Critters = require('critters-webpack-plugin');
module.exports = {
plugins: [
+ new Critters({
+ // optional configuration
+ preload: 'swap',
+ includeSelectors: [/^\.btn/, '.banner'],
+ })
]
}
```
That's it! The resultant html will have its critical CSS inlined and the stylesheets lazy-loaded.
## Usage
<!-- Generated by documentation.js. Update this documentation by updating the source code. -->
### Critters
All optional. Pass them to `new Critters({ ... })`.
#### Parameters
- `options`
#### Properties
- `path` **[String](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String)** Base path location of the CSS files _(default: `''`)_
- `publicPath` **[String](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String)** Public path of the CSS resources. This prefix is removed from the href _(default: `''`)_
- `external` **[Boolean](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean)** Inline styles from external stylesheets _(default: `true`)_
- `inlineThreshold` **[Number](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number)** Inline external stylesheets smaller than a given size _(default: `0`)_
- `minimumExternalSize` **[Number](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number)** If the non-critical external stylesheet would be below this size, just inline it _(default: `0`)_
- `pruneSource` **[Boolean](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean)** Remove inlined rules from the external stylesheet _(default: `false`)_
- `mergeStylesheets` **[Boolean](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean)** Merged inlined stylesheets into a single `<style>` tag _(default: `true`)_
- `additionalStylesheets` **[Array](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array)<[String](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String)>** Glob for matching other stylesheets to be used while looking for critical CSS.
- `reduceInlineStyles` **[Boolean](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean)** Option indicates if inline styles should be evaluated for critical CSS. By default inline style tags will be evaluated and rewritten to only contain critical CSS. Set it to `false` to skip processing inline styles. _(default: `true`)_
- `preload` **[String](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String)** Which [preload strategy](#preloadstrategy) to use
- `noscriptFallback` **[Boolean](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean)** Add `<noscript>` fallback to JS-based strategies
- `inlineFonts` **[Boolean](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean)** Inline critical font-face rules _(default: `false`)_
- `preloadFonts` **[Boolean](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean)** Preloads critical fonts _(default: `true`)_
- `fonts` **[Boolean](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean)** Shorthand for setting `inlineFonts` + `preloadFonts`\* Values:
- `true` to inline critical font-face rules and preload the fonts
- `false` to don't inline any font-face rules and don't preload fonts
- `keyframes` **[String](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String)** Controls which keyframes rules are inlined.\* Values:
- `"critical"`: _(default)_ inline keyframes rules used by the critical CSS
- `"all"` inline all keyframes rules
- `"none"` remove all keyframes rules
- `compress` **[Boolean](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Boolean)** Compress resulting critical CSS _(default: `true`)_
- `logLevel` **[String](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String)** Controls [log level](#loglevel) of the plugin _(default: `"info"`)_
- `logger` **[object](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object)** Provide a custom logger interface [logger](#logger)
- `includeSelectors` **[RegExp](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp)** | **[String](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String)** Provide a list of selectors that should be included in the critical CSS. Accepts both RegExp and string.
### Include/exclude rules
We can include or exclude rules to be part of critical CSS by adding comments in the CSS
Single line comments to include/exclude the next CSS rule
```css
/* critters:exclude */
.selector1 {
/* this rule will be excluded from critical CSS */
}
.selector2 {
/* this will be evaluated normally */
}
/* critters:include */
.selector3 {
/* this rule will be included in the critical CSS */
}
.selector4 {
/* this will be evaluated normally */
}
```
Including/Excluding multiple rules by adding start and end markers
```css
/* critters:exclude start */
.selector1 {
/* this rule will be excluded from critical CSS */
}
.selector2 {
/* this rule will be excluded from critical CSS */
}
/* critters:exclude end */
```
```css
/* critters:include start */
.selector3 {
/* this rule will be included in the critical CSS */
}
.selector4 {
/* this rule will be included in the critical CSS */
}
/* critters:include end */
```
### Critters container
By default Critters evaluates the CSS against the entire input HTML. Critters evaluates the Critical CSS by reconstructing the entire DOM and evaluating the CSS selectors to find matching nodes. Usually this works well as Critters is lightweight and fast.
For some cases, the input HTML can be very large or deeply nested which makes the reconstructed DOM much larger, which in turn can slow down the critical CSS generation. Critters is not aware of viewport size and what specific nodes are above the fold since there is not a headless browser involved.
To overcome this issue Critters makes use of **Critters containers**.
A Critters container mimics the viewport and can be enabled by adding `data-critters-container` into the top level container thats contains the HTML elements above the fold.
You can estimate the contents of your viewport roughly and add a <div `data-critters-container` > around the contents.
```html
<html>
<body>
<div class="container">
<div data-critters-container>
/* HTML inside this container are used to evaluate critical CSS */
</div>
/* HTML is ignored when evaluating critical CSS */
</div>
<footer></footer>
</body>
</html>
```
_Note: This is an easy way to improve the performance of Critters_
### Logger
Custom logger interface:
Type: [object](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object)
#### Properties
- `trace` **function ([String](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String))** Prints a trace message
- `debug` **function ([String](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String))** Prints a debug message
- `info` **function ([String](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String))** Prints an information message
- `warn` **function ([String](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String))** Prints a warning message
- `error` **function ([String](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String))** Prints an error message
### LogLevel
Controls log level of the plugin. Specifies the level the logger should use. A logger will
not produce output for any log level beneath the specified level. Available levels and order
are:
- **"info"** _(default)_
- **"warn"**
- **"error"**
- **"trace"**
- **"debug"**
- **"silent"**
Type: (`"info"` | `"warn"` | `"error"` | `"trace"` | `"debug"` | `"silent"`)
### PreloadStrategy
The mechanism to use for lazy-loading stylesheets.
Note: <kbd>JS</kbd> indicates a strategy requiring JavaScript (falls back to `<noscript>` unless disabled).
- **default:** Move stylesheet links to the end of the document and insert preload meta tags in their place.
- **"body":** Move all external stylesheet links to the end of the document.
- **"media":** Load stylesheets asynchronously by adding `media="not x"` and removing once loaded. <kbd>JS</kbd>
- **"swap":** Convert stylesheet links to preloads that swap to `rel="stylesheet"` once loaded ([details](https://www.filamentgroup.com/lab/load-css-simpler/#the-code)). <kbd>JS</kbd>
- **"swap-high":** Use `<link rel="alternate stylesheet preload">` and swap to `rel="stylesheet"` once loaded ([details](http://filamentgroup.github.io/loadCSS/test/new-high.html)). <kbd>JS</kbd>
- **"js":** Inject an asynchronous CSS loader similar to [LoadCSS](https://github.com/filamentgroup/loadCSS) and use it to load stylesheets. <kbd>JS</kbd>
- **"js-lazy":** Like `"js"`, but the stylesheet is disabled until fully loaded.
- **false:** Disables adding preload tags.
Type: (default | `"body"` | `"media"` | `"swap"` | `"swap-high"` | `"js"` | `"js-lazy"`)
## Similar Libraries
There are a number of other libraries that can inline Critical CSS, each with a slightly different approach. Here are a few great options:
- [Critical](https://github.com/addyosmani/critical)
- [Penthouse](https://github.com/pocketjoso/penthouse)
- [webpack-critical](https://github.com/lukeed/webpack-critical)
- [webpack-plugin-critical](https://github.com/nrwl/webpack-plugin-critical)
- [html-critical-webpack-plugin](https://github.com/anthonygore/html-critical-webpack-plugin)
- [react-snap](https://github.com/stereobooster/react-snap)
## License
[Apache 2.0](LICENSE)
This is not an official Google product.
[critters-webpack-plugin]: https://github.com/GoogleChromeLabs/critters/tree/main/packages/critters-webpack-plugin
[critical css]: https://www.smashingmagazine.com/2015/08/understanding-critical-css/
[html-webpack-plugin]: https://github.com/jantimon/html-webpack-plugin

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declare type CSSColor =
| 'aliceblue'
| 'antiquewhite'
| 'aqua'
| 'aquamarine'
| 'azure'
| 'beige'
| 'bisque'
| 'black'
| 'blanchedalmond'
| 'blue'
| 'blueviolet'
| 'brown'
| 'burlywood'
| 'cadetblue'
| 'chartreuse'
| 'chocolate'
| 'coral'
| 'cornflowerblue'
| 'cornsilk'
| 'crimson'
| 'cyan'
| 'darkblue'
| 'darkcyan'
| 'darkgoldenrod'
| 'darkgray'
| 'darkgreen'
| 'darkgrey'
| 'darkkhaki'
| 'darkmagenta'
| 'darkolivegreen'
| 'darkorange'
| 'darkorchid'
| 'darkred'
| 'darksalmon'
| 'darkseagreen'
| 'darkslateblue'
| 'darkslategray'
| 'darkslategrey'
| 'darkturquoise'
| 'darkviolet'
| 'deeppink'
| 'deepskyblue'
| 'dimgray'
| 'dimgrey'
| 'dodgerblue'
| 'firebrick'
| 'floralwhite'
| 'forestgreen'
| 'fuchsia'
| 'gainsboro'
| 'ghostwhite'
| 'gold'
| 'goldenrod'
| 'gray'
| 'green'
| 'greenyellow'
| 'grey'
| 'honeydew'
| 'hotpink'
| 'indianred'
| 'indigo'
| 'ivory'
| 'khaki'
| 'lavender'
| 'lavenderblush'
| 'lawngreen'
| 'lemonchiffon'
| 'lightblue'
| 'lightcoral'
| 'lightcyan'
| 'lightgoldenrodyellow'
| 'lightgray'
| 'lightgreen'
| 'lightgrey'
| 'lightpink'
| 'lightsalmon'
| 'lightseagreen'
| 'lightskyblue'
| 'lightslategray'
| 'lightslategrey'
| 'lightsteelblue'
| 'lightyellow'
| 'lime'
| 'limegreen'
| 'linen'
| 'magenta'
| 'maroon'
| 'mediumaquamarine'
| 'mediumblue'
| 'mediumorchid'
| 'mediumpurple'
| 'mediumseagreen'
| 'mediumslateblue'
| 'mediumspringgreen'
| 'mediumturquoise'
| 'mediumvioletred'
| 'midnightblue'
| 'mintcream'
| 'mistyrose'
| 'moccasin'
| 'navajowhite'
| 'navy'
| 'oldlace'
| 'olive'
| 'olivedrab'
| 'orange'
| 'orangered'
| 'orchid'
| 'palegoldenrod'
| 'palegreen'
| 'paleturquoise'
| 'palevioletred'
| 'papayawhip'
| 'peachpuff'
| 'peru'
| 'pink'
| 'plum'
| 'powderblue'
| 'purple'
| 'rebeccapurple'
| 'red'
| 'rosybrown'
| 'royalblue'
| 'saddlebrown'
| 'salmon'
| 'sandybrown'
| 'seagreen'
| 'seashell'
| 'sienna'
| 'silver'
| 'skyblue'
| 'slateblue'
| 'slategray'
| 'slategrey'
| 'snow'
| 'springgreen'
| 'steelblue'
| 'tan'
| 'teal'
| 'thistle'
| 'tomato'
| 'turquoise'
| 'violet'
| 'wheat'
| 'white'
| 'whitesmoke'
| 'yellow'
| 'yellowgreen';
declare namespace ansiStyles {
interface ColorConvert {
/**
The RGB color space.
@param red - (`0`-`255`)
@param green - (`0`-`255`)
@param blue - (`0`-`255`)
*/
rgb(red: number, green: number, blue: number): string;
/**
The RGB HEX color space.
@param hex - A hexadecimal string containing RGB data.
*/
hex(hex: string): string;
/**
@param keyword - A CSS color name.
*/
keyword(keyword: CSSColor): string;
/**
The HSL color space.
@param hue - (`0`-`360`)
@param saturation - (`0`-`100`)
@param lightness - (`0`-`100`)
*/
hsl(hue: number, saturation: number, lightness: number): string;
/**
The HSV color space.
@param hue - (`0`-`360`)
@param saturation - (`0`-`100`)
@param value - (`0`-`100`)
*/
hsv(hue: number, saturation: number, value: number): string;
/**
The HSV color space.
@param hue - (`0`-`360`)
@param whiteness - (`0`-`100`)
@param blackness - (`0`-`100`)
*/
hwb(hue: number, whiteness: number, blackness: number): string;
/**
Use a [4-bit unsigned number](https://en.wikipedia.org/wiki/ANSI_escape_code#3/4-bit) to set text color.
*/
ansi(ansi: number): string;
/**
Use an [8-bit unsigned number](https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit) to set text color.
*/
ansi256(ansi: number): string;
}
interface CSPair {
/**
The ANSI terminal control sequence for starting this style.
*/
readonly open: string;
/**
The ANSI terminal control sequence for ending this style.
*/
readonly close: string;
}
interface ColorBase {
readonly ansi: ColorConvert;
readonly ansi256: ColorConvert;
readonly ansi16m: ColorConvert;
/**
The ANSI terminal control sequence for ending this color.
*/
readonly close: string;
}
interface Modifier {
/**
Resets the current color chain.
*/
readonly reset: CSPair;
/**
Make text bold.
*/
readonly bold: CSPair;
/**
Emitting only a small amount of light.
*/
readonly dim: CSPair;
/**
Make text italic. (Not widely supported)
*/
readonly italic: CSPair;
/**
Make text underline. (Not widely supported)
*/
readonly underline: CSPair;
/**
Inverse background and foreground colors.
*/
readonly inverse: CSPair;
/**
Prints the text, but makes it invisible.
*/
readonly hidden: CSPair;
/**
Puts a horizontal line through the center of the text. (Not widely supported)
*/
readonly strikethrough: CSPair;
}
interface ForegroundColor {
readonly black: CSPair;
readonly red: CSPair;
readonly green: CSPair;
readonly yellow: CSPair;
readonly blue: CSPair;
readonly cyan: CSPair;
readonly magenta: CSPair;
readonly white: CSPair;
/**
Alias for `blackBright`.
*/
readonly gray: CSPair;
/**
Alias for `blackBright`.
*/
readonly grey: CSPair;
readonly blackBright: CSPair;
readonly redBright: CSPair;
readonly greenBright: CSPair;
readonly yellowBright: CSPair;
readonly blueBright: CSPair;
readonly cyanBright: CSPair;
readonly magentaBright: CSPair;
readonly whiteBright: CSPair;
}
interface BackgroundColor {
readonly bgBlack: CSPair;
readonly bgRed: CSPair;
readonly bgGreen: CSPair;
readonly bgYellow: CSPair;
readonly bgBlue: CSPair;
readonly bgCyan: CSPair;
readonly bgMagenta: CSPair;
readonly bgWhite: CSPair;
/**
Alias for `bgBlackBright`.
*/
readonly bgGray: CSPair;
/**
Alias for `bgBlackBright`.
*/
readonly bgGrey: CSPair;
readonly bgBlackBright: CSPair;
readonly bgRedBright: CSPair;
readonly bgGreenBright: CSPair;
readonly bgYellowBright: CSPair;
readonly bgBlueBright: CSPair;
readonly bgCyanBright: CSPair;
readonly bgMagentaBright: CSPair;
readonly bgWhiteBright: CSPair;
}
}
declare const ansiStyles: {
readonly modifier: ansiStyles.Modifier;
readonly color: ansiStyles.ForegroundColor & ansiStyles.ColorBase;
readonly bgColor: ansiStyles.BackgroundColor & ansiStyles.ColorBase;
readonly codes: ReadonlyMap<number, number>;
} & ansiStyles.BackgroundColor & ansiStyles.ForegroundColor & ansiStyles.Modifier;
export = ansiStyles;

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'use strict';
const wrapAnsi16 = (fn, offset) => (...args) => {
const code = fn(...args);
return `\u001B[${code + offset}m`;
};
const wrapAnsi256 = (fn, offset) => (...args) => {
const code = fn(...args);
return `\u001B[${38 + offset};5;${code}m`;
};
const wrapAnsi16m = (fn, offset) => (...args) => {
const rgb = fn(...args);
return `\u001B[${38 + offset};2;${rgb[0]};${rgb[1]};${rgb[2]}m`;
};
const ansi2ansi = n => n;
const rgb2rgb = (r, g, b) => [r, g, b];
const setLazyProperty = (object, property, get) => {
Object.defineProperty(object, property, {
get: () => {
const value = get();
Object.defineProperty(object, property, {
value,
enumerable: true,
configurable: true
});
return value;
},
enumerable: true,
configurable: true
});
};
/** @type {typeof import('color-convert')} */
let colorConvert;
const makeDynamicStyles = (wrap, targetSpace, identity, isBackground) => {
if (colorConvert === undefined) {
colorConvert = require('color-convert');
}
const offset = isBackground ? 10 : 0;
const styles = {};
for (const [sourceSpace, suite] of Object.entries(colorConvert)) {
const name = sourceSpace === 'ansi16' ? 'ansi' : sourceSpace;
if (sourceSpace === targetSpace) {
styles[name] = wrap(identity, offset);
} else if (typeof suite === 'object') {
styles[name] = wrap(suite[targetSpace], offset);
}
}
return styles;
};
function assembleStyles() {
const codes = new Map();
const styles = {
modifier: {
reset: [0, 0],
// 21 isn't widely supported and 22 does the same thing
bold: [1, 22],
dim: [2, 22],
italic: [3, 23],
underline: [4, 24],
inverse: [7, 27],
hidden: [8, 28],
strikethrough: [9, 29]
},
color: {
black: [30, 39],
red: [31, 39],
green: [32, 39],
yellow: [33, 39],
blue: [34, 39],
magenta: [35, 39],
cyan: [36, 39],
white: [37, 39],
// Bright color
blackBright: [90, 39],
redBright: [91, 39],
greenBright: [92, 39],
yellowBright: [93, 39],
blueBright: [94, 39],
magentaBright: [95, 39],
cyanBright: [96, 39],
whiteBright: [97, 39]
},
bgColor: {
bgBlack: [40, 49],
bgRed: [41, 49],
bgGreen: [42, 49],
bgYellow: [43, 49],
bgBlue: [44, 49],
bgMagenta: [45, 49],
bgCyan: [46, 49],
bgWhite: [47, 49],
// Bright color
bgBlackBright: [100, 49],
bgRedBright: [101, 49],
bgGreenBright: [102, 49],
bgYellowBright: [103, 49],
bgBlueBright: [104, 49],
bgMagentaBright: [105, 49],
bgCyanBright: [106, 49],
bgWhiteBright: [107, 49]
}
};
// Alias bright black as gray (and grey)
styles.color.gray = styles.color.blackBright;
styles.bgColor.bgGray = styles.bgColor.bgBlackBright;
styles.color.grey = styles.color.blackBright;
styles.bgColor.bgGrey = styles.bgColor.bgBlackBright;
for (const [groupName, group] of Object.entries(styles)) {
for (const [styleName, style] of Object.entries(group)) {
styles[styleName] = {
open: `\u001B[${style[0]}m`,
close: `\u001B[${style[1]}m`
};
group[styleName] = styles[styleName];
codes.set(style[0], style[1]);
}
Object.defineProperty(styles, groupName, {
value: group,
enumerable: false
});
}
Object.defineProperty(styles, 'codes', {
value: codes,
enumerable: false
});
styles.color.close = '\u001B[39m';
styles.bgColor.close = '\u001B[49m';
setLazyProperty(styles.color, 'ansi', () => makeDynamicStyles(wrapAnsi16, 'ansi16', ansi2ansi, false));
setLazyProperty(styles.color, 'ansi256', () => makeDynamicStyles(wrapAnsi256, 'ansi256', ansi2ansi, false));
setLazyProperty(styles.color, 'ansi16m', () => makeDynamicStyles(wrapAnsi16m, 'rgb', rgb2rgb, false));
setLazyProperty(styles.bgColor, 'ansi', () => makeDynamicStyles(wrapAnsi16, 'ansi16', ansi2ansi, true));
setLazyProperty(styles.bgColor, 'ansi256', () => makeDynamicStyles(wrapAnsi256, 'ansi256', ansi2ansi, true));
setLazyProperty(styles.bgColor, 'ansi16m', () => makeDynamicStyles(wrapAnsi16m, 'rgb', rgb2rgb, true));
return styles;
}
// Make the export immutable
Object.defineProperty(module, 'exports', {
enumerable: true,
get: assembleStyles
});

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MIT License
Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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{
"name": "ansi-styles",
"version": "4.3.0",
"description": "ANSI escape codes for styling strings in the terminal",
"license": "MIT",
"repository": "chalk/ansi-styles",
"funding": "https://github.com/chalk/ansi-styles?sponsor=1",
"author": {
"name": "Sindre Sorhus",
"email": "sindresorhus@gmail.com",
"url": "sindresorhus.com"
},
"engines": {
"node": ">=8"
},
"scripts": {
"test": "xo && ava && tsd",
"screenshot": "svg-term --command='node screenshot' --out=screenshot.svg --padding=3 --width=55 --height=3 --at=1000 --no-cursor"
},
"files": [
"index.js",
"index.d.ts"
],
"keywords": [
"ansi",
"styles",
"color",
"colour",
"colors",
"terminal",
"console",
"cli",
"string",
"tty",
"escape",
"formatting",
"rgb",
"256",
"shell",
"xterm",
"log",
"logging",
"command-line",
"text"
],
"dependencies": {
"color-convert": "^2.0.1"
},
"devDependencies": {
"@types/color-convert": "^1.9.0",
"ava": "^2.3.0",
"svg-term-cli": "^2.1.1",
"tsd": "^0.11.0",
"xo": "^0.25.3"
}
}

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# ansi-styles [![Build Status](https://travis-ci.org/chalk/ansi-styles.svg?branch=master)](https://travis-ci.org/chalk/ansi-styles)
> [ANSI escape codes](https://en.wikipedia.org/wiki/ANSI_escape_code#Colors_and_Styles) for styling strings in the terminal
You probably want the higher-level [chalk](https://github.com/chalk/chalk) module for styling your strings.
<img src="screenshot.svg" width="900">
## Install
```
$ npm install ansi-styles
```
## Usage
```js
const style = require('ansi-styles');
console.log(`${style.green.open}Hello world!${style.green.close}`);
// Color conversion between 16/256/truecolor
// NOTE: If conversion goes to 16 colors or 256 colors, the original color
// may be degraded to fit that color palette. This means terminals
// that do not support 16 million colors will best-match the
// original color.
console.log(style.bgColor.ansi.hsl(120, 80, 72) + 'Hello world!' + style.bgColor.close);
console.log(style.color.ansi256.rgb(199, 20, 250) + 'Hello world!' + style.color.close);
console.log(style.color.ansi16m.hex('#abcdef') + 'Hello world!' + style.color.close);
```
## API
Each style has an `open` and `close` property.
## Styles
### Modifiers
- `reset`
- `bold`
- `dim`
- `italic` *(Not widely supported)*
- `underline`
- `inverse`
- `hidden`
- `strikethrough` *(Not widely supported)*
### Colors
- `black`
- `red`
- `green`
- `yellow`
- `blue`
- `magenta`
- `cyan`
- `white`
- `blackBright` (alias: `gray`, `grey`)
- `redBright`
- `greenBright`
- `yellowBright`
- `blueBright`
- `magentaBright`
- `cyanBright`
- `whiteBright`
### Background colors
- `bgBlack`
- `bgRed`
- `bgGreen`
- `bgYellow`
- `bgBlue`
- `bgMagenta`
- `bgCyan`
- `bgWhite`
- `bgBlackBright` (alias: `bgGray`, `bgGrey`)
- `bgRedBright`
- `bgGreenBright`
- `bgYellowBright`
- `bgBlueBright`
- `bgMagentaBright`
- `bgCyanBright`
- `bgWhiteBright`
## Advanced usage
By default, you get a map of styles, but the styles are also available as groups. They are non-enumerable so they don't show up unless you access them explicitly. This makes it easier to expose only a subset in a higher-level module.
- `style.modifier`
- `style.color`
- `style.bgColor`
###### Example
```js
console.log(style.color.green.open);
```
Raw escape codes (i.e. without the CSI escape prefix `\u001B[` and render mode postfix `m`) are available under `style.codes`, which returns a `Map` with the open codes as keys and close codes as values.
###### Example
```js
console.log(style.codes.get(36));
//=> 39
```
## [256 / 16 million (TrueColor) support](https://gist.github.com/XVilka/8346728)
`ansi-styles` uses the [`color-convert`](https://github.com/Qix-/color-convert) package to allow for converting between various colors and ANSI escapes, with support for 256 and 16 million colors.
The following color spaces from `color-convert` are supported:
- `rgb`
- `hex`
- `keyword`
- `hsl`
- `hsv`
- `hwb`
- `ansi`
- `ansi256`
To use these, call the associated conversion function with the intended output, for example:
```js
style.color.ansi.rgb(100, 200, 15); // RGB to 16 color ansi foreground code
style.bgColor.ansi.rgb(100, 200, 15); // RGB to 16 color ansi background code
style.color.ansi256.hsl(120, 100, 60); // HSL to 256 color ansi foreground code
style.bgColor.ansi256.hsl(120, 100, 60); // HSL to 256 color ansi foreground code
style.color.ansi16m.hex('#C0FFEE'); // Hex (RGB) to 16 million color foreground code
style.bgColor.ansi16m.hex('#C0FFEE'); // Hex (RGB) to 16 million color background code
```
## Related
- [ansi-escapes](https://github.com/sindresorhus/ansi-escapes) - ANSI escape codes for manipulating the terminal
## Maintainers
- [Sindre Sorhus](https://github.com/sindresorhus)
- [Josh Junon](https://github.com/qix-)
## For enterprise
Available as part of the Tidelift Subscription.
The maintainers of `ansi-styles` and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use. [Learn more.](https://tidelift.com/subscription/pkg/npm-ansi-styles?utm_source=npm-ansi-styles&utm_medium=referral&utm_campaign=enterprise&utm_term=repo)

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/**
Basic foreground colors.
[More colors here.](https://github.com/chalk/chalk/blob/master/readme.md#256-and-truecolor-color-support)
*/
declare type ForegroundColor =
| 'black'
| 'red'
| 'green'
| 'yellow'
| 'blue'
| 'magenta'
| 'cyan'
| 'white'
| 'gray'
| 'grey'
| 'blackBright'
| 'redBright'
| 'greenBright'
| 'yellowBright'
| 'blueBright'
| 'magentaBright'
| 'cyanBright'
| 'whiteBright';
/**
Basic background colors.
[More colors here.](https://github.com/chalk/chalk/blob/master/readme.md#256-and-truecolor-color-support)
*/
declare type BackgroundColor =
| 'bgBlack'
| 'bgRed'
| 'bgGreen'
| 'bgYellow'
| 'bgBlue'
| 'bgMagenta'
| 'bgCyan'
| 'bgWhite'
| 'bgGray'
| 'bgGrey'
| 'bgBlackBright'
| 'bgRedBright'
| 'bgGreenBright'
| 'bgYellowBright'
| 'bgBlueBright'
| 'bgMagentaBright'
| 'bgCyanBright'
| 'bgWhiteBright';
/**
Basic colors.
[More colors here.](https://github.com/chalk/chalk/blob/master/readme.md#256-and-truecolor-color-support)
*/
declare type Color = ForegroundColor | BackgroundColor;
declare type Modifiers =
| 'reset'
| 'bold'
| 'dim'
| 'italic'
| 'underline'
| 'inverse'
| 'hidden'
| 'strikethrough'
| 'visible';
declare namespace chalk {
/**
Levels:
- `0` - All colors disabled.
- `1` - Basic 16 colors support.
- `2` - ANSI 256 colors support.
- `3` - Truecolor 16 million colors support.
*/
type Level = 0 | 1 | 2 | 3;
interface Options {
/**
Specify the color support for Chalk.
By default, color support is automatically detected based on the environment.
Levels:
- `0` - All colors disabled.
- `1` - Basic 16 colors support.
- `2` - ANSI 256 colors support.
- `3` - Truecolor 16 million colors support.
*/
level?: Level;
}
/**
Return a new Chalk instance.
*/
type Instance = new (options?: Options) => Chalk;
/**
Detect whether the terminal supports color.
*/
interface ColorSupport {
/**
The color level used by Chalk.
*/
level: Level;
/**
Return whether Chalk supports basic 16 colors.
*/
hasBasic: boolean;
/**
Return whether Chalk supports ANSI 256 colors.
*/
has256: boolean;
/**
Return whether Chalk supports Truecolor 16 million colors.
*/
has16m: boolean;
}
interface ChalkFunction {
/**
Use a template string.
@remarks Template literals are unsupported for nested calls (see [issue #341](https://github.com/chalk/chalk/issues/341))
@example
```
import chalk = require('chalk');
log(chalk`
CPU: {red ${cpu.totalPercent}%}
RAM: {green ${ram.used / ram.total * 100}%}
DISK: {rgb(255,131,0) ${disk.used / disk.total * 100}%}
`);
```
@example
```
import chalk = require('chalk');
log(chalk.red.bgBlack`2 + 3 = {bold ${2 + 3}}`)
```
*/
(text: TemplateStringsArray, ...placeholders: unknown[]): string;
(...text: unknown[]): string;
}
interface Chalk extends ChalkFunction {
/**
Return a new Chalk instance.
*/
Instance: Instance;
/**
The color support for Chalk.
By default, color support is automatically detected based on the environment.
Levels:
- `0` - All colors disabled.
- `1` - Basic 16 colors support.
- `2` - ANSI 256 colors support.
- `3` - Truecolor 16 million colors support.
*/
level: Level;
/**
Use HEX value to set text color.
@param color - Hexadecimal value representing the desired color.
@example
```
import chalk = require('chalk');
chalk.hex('#DEADED');
```
*/
hex(color: string): Chalk;
/**
Use keyword color value to set text color.
@param color - Keyword value representing the desired color.
@example
```
import chalk = require('chalk');
chalk.keyword('orange');
```
*/
keyword(color: string): Chalk;
/**
Use RGB values to set text color.
*/
rgb(red: number, green: number, blue: number): Chalk;
/**
Use HSL values to set text color.
*/
hsl(hue: number, saturation: number, lightness: number): Chalk;
/**
Use HSV values to set text color.
*/
hsv(hue: number, saturation: number, value: number): Chalk;
/**
Use HWB values to set text color.
*/
hwb(hue: number, whiteness: number, blackness: number): Chalk;
/**
Use a [Select/Set Graphic Rendition](https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_parameters) (SGR) [color code number](https://en.wikipedia.org/wiki/ANSI_escape_code#3/4_bit) to set text color.
30 <= code && code < 38 || 90 <= code && code < 98
For example, 31 for red, 91 for redBright.
*/
ansi(code: number): Chalk;
/**
Use a [8-bit unsigned number](https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit) to set text color.
*/
ansi256(index: number): Chalk;
/**
Use HEX value to set background color.
@param color - Hexadecimal value representing the desired color.
@example
```
import chalk = require('chalk');
chalk.bgHex('#DEADED');
```
*/
bgHex(color: string): Chalk;
/**
Use keyword color value to set background color.
@param color - Keyword value representing the desired color.
@example
```
import chalk = require('chalk');
chalk.bgKeyword('orange');
```
*/
bgKeyword(color: string): Chalk;
/**
Use RGB values to set background color.
*/
bgRgb(red: number, green: number, blue: number): Chalk;
/**
Use HSL values to set background color.
*/
bgHsl(hue: number, saturation: number, lightness: number): Chalk;
/**
Use HSV values to set background color.
*/
bgHsv(hue: number, saturation: number, value: number): Chalk;
/**
Use HWB values to set background color.
*/
bgHwb(hue: number, whiteness: number, blackness: number): Chalk;
/**
Use a [Select/Set Graphic Rendition](https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_parameters) (SGR) [color code number](https://en.wikipedia.org/wiki/ANSI_escape_code#3/4_bit) to set background color.
30 <= code && code < 38 || 90 <= code && code < 98
For example, 31 for red, 91 for redBright.
Use the foreground code, not the background code (for example, not 41, nor 101).
*/
bgAnsi(code: number): Chalk;
/**
Use a [8-bit unsigned number](https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit) to set background color.
*/
bgAnsi256(index: number): Chalk;
/**
Modifier: Resets the current color chain.
*/
readonly reset: Chalk;
/**
Modifier: Make text bold.
*/
readonly bold: Chalk;
/**
Modifier: Emitting only a small amount of light.
*/
readonly dim: Chalk;
/**
Modifier: Make text italic. (Not widely supported)
*/
readonly italic: Chalk;
/**
Modifier: Make text underline. (Not widely supported)
*/
readonly underline: Chalk;
/**
Modifier: Inverse background and foreground colors.
*/
readonly inverse: Chalk;
/**
Modifier: Prints the text, but makes it invisible.
*/
readonly hidden: Chalk;
/**
Modifier: Puts a horizontal line through the center of the text. (Not widely supported)
*/
readonly strikethrough: Chalk;
/**
Modifier: Prints the text only when Chalk has a color support level > 0.
Can be useful for things that are purely cosmetic.
*/
readonly visible: Chalk;
readonly black: Chalk;
readonly red: Chalk;
readonly green: Chalk;
readonly yellow: Chalk;
readonly blue: Chalk;
readonly magenta: Chalk;
readonly cyan: Chalk;
readonly white: Chalk;
/*
Alias for `blackBright`.
*/
readonly gray: Chalk;
/*
Alias for `blackBright`.
*/
readonly grey: Chalk;
readonly blackBright: Chalk;
readonly redBright: Chalk;
readonly greenBright: Chalk;
readonly yellowBright: Chalk;
readonly blueBright: Chalk;
readonly magentaBright: Chalk;
readonly cyanBright: Chalk;
readonly whiteBright: Chalk;
readonly bgBlack: Chalk;
readonly bgRed: Chalk;
readonly bgGreen: Chalk;
readonly bgYellow: Chalk;
readonly bgBlue: Chalk;
readonly bgMagenta: Chalk;
readonly bgCyan: Chalk;
readonly bgWhite: Chalk;
/*
Alias for `bgBlackBright`.
*/
readonly bgGray: Chalk;
/*
Alias for `bgBlackBright`.
*/
readonly bgGrey: Chalk;
readonly bgBlackBright: Chalk;
readonly bgRedBright: Chalk;
readonly bgGreenBright: Chalk;
readonly bgYellowBright: Chalk;
readonly bgBlueBright: Chalk;
readonly bgMagentaBright: Chalk;
readonly bgCyanBright: Chalk;
readonly bgWhiteBright: Chalk;
}
}
/**
Main Chalk object that allows to chain styles together.
Call the last one as a method with a string argument.
Order doesn't matter, and later styles take precedent in case of a conflict.
This simply means that `chalk.red.yellow.green` is equivalent to `chalk.green`.
*/
declare const chalk: chalk.Chalk & chalk.ChalkFunction & {
supportsColor: chalk.ColorSupport | false;
Level: chalk.Level;
Color: Color;
ForegroundColor: ForegroundColor;
BackgroundColor: BackgroundColor;
Modifiers: Modifiers;
stderr: chalk.Chalk & {supportsColor: chalk.ColorSupport | false};
};
export = chalk;

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MIT License
Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

68
my-app/node_modules/critters/node_modules/chalk/package.json generated vendored Executable file
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{
"name": "chalk",
"version": "4.1.2",
"description": "Terminal string styling done right",
"license": "MIT",
"repository": "chalk/chalk",
"funding": "https://github.com/chalk/chalk?sponsor=1",
"main": "source",
"engines": {
"node": ">=10"
},
"scripts": {
"test": "xo && nyc ava && tsd",
"bench": "matcha benchmark.js"
},
"files": [
"source",
"index.d.ts"
],
"keywords": [
"color",
"colour",
"colors",
"terminal",
"console",
"cli",
"string",
"str",
"ansi",
"style",
"styles",
"tty",
"formatting",
"rgb",
"256",
"shell",
"xterm",
"log",
"logging",
"command-line",
"text"
],
"dependencies": {
"ansi-styles": "^4.1.0",
"supports-color": "^7.1.0"
},
"devDependencies": {
"ava": "^2.4.0",
"coveralls": "^3.0.7",
"execa": "^4.0.0",
"import-fresh": "^3.1.0",
"matcha": "^0.7.0",
"nyc": "^15.0.0",
"resolve-from": "^5.0.0",
"tsd": "^0.7.4",
"xo": "^0.28.2"
},
"xo": {
"rules": {
"unicorn/prefer-string-slice": "off",
"unicorn/prefer-includes": "off",
"@typescript-eslint/member-ordering": "off",
"no-redeclare": "off",
"unicorn/string-content": "off",
"unicorn/better-regex": "off"
}
}
}

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<h1 align="center">
<br>
<br>
<img width="320" src="media/logo.svg" alt="Chalk">
<br>
<br>
<br>
</h1>
> Terminal string styling done right
[![Build Status](https://travis-ci.org/chalk/chalk.svg?branch=master)](https://travis-ci.org/chalk/chalk) [![Coverage Status](https://coveralls.io/repos/github/chalk/chalk/badge.svg?branch=master)](https://coveralls.io/github/chalk/chalk?branch=master) [![npm dependents](https://badgen.net/npm/dependents/chalk)](https://www.npmjs.com/package/chalk?activeTab=dependents) [![Downloads](https://badgen.net/npm/dt/chalk)](https://www.npmjs.com/package/chalk) [![](https://img.shields.io/badge/unicorn-approved-ff69b4.svg)](https://www.youtube.com/watch?v=9auOCbH5Ns4) [![XO code style](https://img.shields.io/badge/code_style-XO-5ed9c7.svg)](https://github.com/xojs/xo) ![TypeScript-ready](https://img.shields.io/npm/types/chalk.svg) [![run on repl.it](https://repl.it/badge/github/chalk/chalk)](https://repl.it/github/chalk/chalk)
<img src="https://cdn.jsdelivr.net/gh/chalk/ansi-styles@8261697c95bf34b6c7767e2cbe9941a851d59385/screenshot.svg" width="900">
<br>
---
<div align="center">
<p>
<p>
<sup>
Sindre Sorhus' open source work is supported by the community on <a href="https://github.com/sponsors/sindresorhus">GitHub Sponsors</a> and <a href="https://stakes.social/0x44d871aebF0126Bf646753E2C976Aa7e68A66c15">Dev</a>
</sup>
</p>
<sup>Special thanks to:</sup>
<br>
<br>
<a href="https://standardresume.co/tech">
<img src="https://sindresorhus.com/assets/thanks/standard-resume-logo.svg" width="160"/>
</a>
<br>
<br>
<a href="https://retool.com/?utm_campaign=sindresorhus">
<img src="https://sindresorhus.com/assets/thanks/retool-logo.svg" width="230"/>
</a>
<br>
<br>
<a href="https://doppler.com/?utm_campaign=github_repo&utm_medium=referral&utm_content=chalk&utm_source=github">
<div>
<img src="https://dashboard.doppler.com/imgs/logo-long.svg" width="240" alt="Doppler">
</div>
<b>All your environment variables, in one place</b>
<div>
<span>Stop struggling with scattered API keys, hacking together home-brewed tools,</span>
<br>
<span>and avoiding access controls. Keep your team and servers in sync with Doppler.</span>
</div>
</a>
<br>
<a href="https://uibakery.io/?utm_source=chalk&utm_medium=sponsor&utm_campaign=github">
<div>
<img src="https://sindresorhus.com/assets/thanks/uibakery-logo.jpg" width="270" alt="UI Bakery">
</div>
</a>
</p>
</div>
---
<br>
## Highlights
- Expressive API
- Highly performant
- Ability to nest styles
- [256/Truecolor color support](#256-and-truecolor-color-support)
- Auto-detects color support
- Doesn't extend `String.prototype`
- Clean and focused
- Actively maintained
- [Used by ~50,000 packages](https://www.npmjs.com/browse/depended/chalk) as of January 1, 2020
## Install
```console
$ npm install chalk
```
## Usage
```js
const chalk = require('chalk');
console.log(chalk.blue('Hello world!'));
```
Chalk comes with an easy to use composable API where you just chain and nest the styles you want.
```js
const chalk = require('chalk');
const log = console.log;
// Combine styled and normal strings
log(chalk.blue('Hello') + ' World' + chalk.red('!'));
// Compose multiple styles using the chainable API
log(chalk.blue.bgRed.bold('Hello world!'));
// Pass in multiple arguments
log(chalk.blue('Hello', 'World!', 'Foo', 'bar', 'biz', 'baz'));
// Nest styles
log(chalk.red('Hello', chalk.underline.bgBlue('world') + '!'));
// Nest styles of the same type even (color, underline, background)
log(chalk.green(
'I am a green line ' +
chalk.blue.underline.bold('with a blue substring') +
' that becomes green again!'
));
// ES2015 template literal
log(`
CPU: ${chalk.red('90%')}
RAM: ${chalk.green('40%')}
DISK: ${chalk.yellow('70%')}
`);
// ES2015 tagged template literal
log(chalk`
CPU: {red ${cpu.totalPercent}%}
RAM: {green ${ram.used / ram.total * 100}%}
DISK: {rgb(255,131,0) ${disk.used / disk.total * 100}%}
`);
// Use RGB colors in terminal emulators that support it.
log(chalk.keyword('orange')('Yay for orange colored text!'));
log(chalk.rgb(123, 45, 67).underline('Underlined reddish color'));
log(chalk.hex('#DEADED').bold('Bold gray!'));
```
Easily define your own themes:
```js
const chalk = require('chalk');
const error = chalk.bold.red;
const warning = chalk.keyword('orange');
console.log(error('Error!'));
console.log(warning('Warning!'));
```
Take advantage of console.log [string substitution](https://nodejs.org/docs/latest/api/console.html#console_console_log_data_args):
```js
const name = 'Sindre';
console.log(chalk.green('Hello %s'), name);
//=> 'Hello Sindre'
```
## API
### chalk.`<style>[.<style>...](string, [string...])`
Example: `chalk.red.bold.underline('Hello', 'world');`
Chain [styles](#styles) and call the last one as a method with a string argument. Order doesn't matter, and later styles take precedent in case of a conflict. This simply means that `chalk.red.yellow.green` is equivalent to `chalk.green`.
Multiple arguments will be separated by space.
### chalk.level
Specifies the level of color support.
Color support is automatically detected, but you can override it by setting the `level` property. You should however only do this in your own code as it applies globally to all Chalk consumers.
If you need to change this in a reusable module, create a new instance:
```js
const ctx = new chalk.Instance({level: 0});
```
| Level | Description |
| :---: | :--- |
| `0` | All colors disabled |
| `1` | Basic color support (16 colors) |
| `2` | 256 color support |
| `3` | Truecolor support (16 million colors) |
### chalk.supportsColor
Detect whether the terminal [supports color](https://github.com/chalk/supports-color). Used internally and handled for you, but exposed for convenience.
Can be overridden by the user with the flags `--color` and `--no-color`. For situations where using `--color` is not possible, use the environment variable `FORCE_COLOR=1` (level 1), `FORCE_COLOR=2` (level 2), or `FORCE_COLOR=3` (level 3) to forcefully enable color, or `FORCE_COLOR=0` to forcefully disable. The use of `FORCE_COLOR` overrides all other color support checks.
Explicit 256/Truecolor mode can be enabled using the `--color=256` and `--color=16m` flags, respectively.
### chalk.stderr and chalk.stderr.supportsColor
`chalk.stderr` contains a separate instance configured with color support detected for `stderr` stream instead of `stdout`. Override rules from `chalk.supportsColor` apply to this too. `chalk.stderr.supportsColor` is exposed for convenience.
## Styles
### Modifiers
- `reset` - Resets the current color chain.
- `bold` - Make text bold.
- `dim` - Emitting only a small amount of light.
- `italic` - Make text italic. *(Not widely supported)*
- `underline` - Make text underline. *(Not widely supported)*
- `inverse`- Inverse background and foreground colors.
- `hidden` - Prints the text, but makes it invisible.
- `strikethrough` - Puts a horizontal line through the center of the text. *(Not widely supported)*
- `visible`- Prints the text only when Chalk has a color level > 0. Can be useful for things that are purely cosmetic.
### Colors
- `black`
- `red`
- `green`
- `yellow`
- `blue`
- `magenta`
- `cyan`
- `white`
- `blackBright` (alias: `gray`, `grey`)
- `redBright`
- `greenBright`
- `yellowBright`
- `blueBright`
- `magentaBright`
- `cyanBright`
- `whiteBright`
### Background colors
- `bgBlack`
- `bgRed`
- `bgGreen`
- `bgYellow`
- `bgBlue`
- `bgMagenta`
- `bgCyan`
- `bgWhite`
- `bgBlackBright` (alias: `bgGray`, `bgGrey`)
- `bgRedBright`
- `bgGreenBright`
- `bgYellowBright`
- `bgBlueBright`
- `bgMagentaBright`
- `bgCyanBright`
- `bgWhiteBright`
## Tagged template literal
Chalk can be used as a [tagged template literal](https://exploringjs.com/es6/ch_template-literals.html#_tagged-template-literals).
```js
const chalk = require('chalk');
const miles = 18;
const calculateFeet = miles => miles * 5280;
console.log(chalk`
There are {bold 5280 feet} in a mile.
In {bold ${miles} miles}, there are {green.bold ${calculateFeet(miles)} feet}.
`);
```
Blocks are delimited by an opening curly brace (`{`), a style, some content, and a closing curly brace (`}`).
Template styles are chained exactly like normal Chalk styles. The following three statements are equivalent:
```js
console.log(chalk.bold.rgb(10, 100, 200)('Hello!'));
console.log(chalk.bold.rgb(10, 100, 200)`Hello!`);
console.log(chalk`{bold.rgb(10,100,200) Hello!}`);
```
Note that function styles (`rgb()`, `hsl()`, `keyword()`, etc.) may not contain spaces between parameters.
All interpolated values (`` chalk`${foo}` ``) are converted to strings via the `.toString()` method. All curly braces (`{` and `}`) in interpolated value strings are escaped.
## 256 and Truecolor color support
Chalk supports 256 colors and [Truecolor](https://gist.github.com/XVilka/8346728) (16 million colors) on supported terminal apps.
Colors are downsampled from 16 million RGB values to an ANSI color format that is supported by the terminal emulator (or by specifying `{level: n}` as a Chalk option). For example, Chalk configured to run at level 1 (basic color support) will downsample an RGB value of #FF0000 (red) to 31 (ANSI escape for red).
Examples:
- `chalk.hex('#DEADED').underline('Hello, world!')`
- `chalk.keyword('orange')('Some orange text')`
- `chalk.rgb(15, 100, 204).inverse('Hello!')`
Background versions of these models are prefixed with `bg` and the first level of the module capitalized (e.g. `keyword` for foreground colors and `bgKeyword` for background colors).
- `chalk.bgHex('#DEADED').underline('Hello, world!')`
- `chalk.bgKeyword('orange')('Some orange text')`
- `chalk.bgRgb(15, 100, 204).inverse('Hello!')`
The following color models can be used:
- [`rgb`](https://en.wikipedia.org/wiki/RGB_color_model) - Example: `chalk.rgb(255, 136, 0).bold('Orange!')`
- [`hex`](https://en.wikipedia.org/wiki/Web_colors#Hex_triplet) - Example: `chalk.hex('#FF8800').bold('Orange!')`
- [`keyword`](https://www.w3.org/wiki/CSS/Properties/color/keywords) (CSS keywords) - Example: `chalk.keyword('orange').bold('Orange!')`
- [`hsl`](https://en.wikipedia.org/wiki/HSL_and_HSV) - Example: `chalk.hsl(32, 100, 50).bold('Orange!')`
- [`hsv`](https://en.wikipedia.org/wiki/HSL_and_HSV) - Example: `chalk.hsv(32, 100, 100).bold('Orange!')`
- [`hwb`](https://en.wikipedia.org/wiki/HWB_color_model) - Example: `chalk.hwb(32, 0, 50).bold('Orange!')`
- [`ansi`](https://en.wikipedia.org/wiki/ANSI_escape_code#3/4_bit) - Example: `chalk.ansi(31).bgAnsi(93)('red on yellowBright')`
- [`ansi256`](https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit) - Example: `chalk.bgAnsi256(194)('Honeydew, more or less')`
## Windows
If you're on Windows, do yourself a favor and use [Windows Terminal](https://github.com/microsoft/terminal) instead of `cmd.exe`.
## Origin story
[colors.js](https://github.com/Marak/colors.js) used to be the most popular string styling module, but it has serious deficiencies like extending `String.prototype` which causes all kinds of [problems](https://github.com/yeoman/yo/issues/68) and the package is unmaintained. Although there are other packages, they either do too much or not enough. Chalk is a clean and focused alternative.
## chalk for enterprise
Available as part of the Tidelift Subscription.
The maintainers of chalk and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use. [Learn more.](https://tidelift.com/subscription/pkg/npm-chalk?utm_source=npm-chalk&utm_medium=referral&utm_campaign=enterprise&utm_term=repo)
## Related
- [chalk-cli](https://github.com/chalk/chalk-cli) - CLI for this module
- [ansi-styles](https://github.com/chalk/ansi-styles) - ANSI escape codes for styling strings in the terminal
- [supports-color](https://github.com/chalk/supports-color) - Detect whether a terminal supports color
- [strip-ansi](https://github.com/chalk/strip-ansi) - Strip ANSI escape codes
- [strip-ansi-stream](https://github.com/chalk/strip-ansi-stream) - Strip ANSI escape codes from a stream
- [has-ansi](https://github.com/chalk/has-ansi) - Check if a string has ANSI escape codes
- [ansi-regex](https://github.com/chalk/ansi-regex) - Regular expression for matching ANSI escape codes
- [wrap-ansi](https://github.com/chalk/wrap-ansi) - Wordwrap a string with ANSI escape codes
- [slice-ansi](https://github.com/chalk/slice-ansi) - Slice a string with ANSI escape codes
- [color-convert](https://github.com/qix-/color-convert) - Converts colors between different models
- [chalk-animation](https://github.com/bokub/chalk-animation) - Animate strings in the terminal
- [gradient-string](https://github.com/bokub/gradient-string) - Apply color gradients to strings
- [chalk-pipe](https://github.com/LitoMore/chalk-pipe) - Create chalk style schemes with simpler style strings
- [terminal-link](https://github.com/sindresorhus/terminal-link) - Create clickable links in the terminal
## Maintainers
- [Sindre Sorhus](https://github.com/sindresorhus)
- [Josh Junon](https://github.com/qix-)

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'use strict';
const ansiStyles = require('ansi-styles');
const {stdout: stdoutColor, stderr: stderrColor} = require('supports-color');
const {
stringReplaceAll,
stringEncaseCRLFWithFirstIndex
} = require('./util');
const {isArray} = Array;
// `supportsColor.level` → `ansiStyles.color[name]` mapping
const levelMapping = [
'ansi',
'ansi',
'ansi256',
'ansi16m'
];
const styles = Object.create(null);
const applyOptions = (object, options = {}) => {
if (options.level && !(Number.isInteger(options.level) && options.level >= 0 && options.level <= 3)) {
throw new Error('The `level` option should be an integer from 0 to 3');
}
// Detect level if not set manually
const colorLevel = stdoutColor ? stdoutColor.level : 0;
object.level = options.level === undefined ? colorLevel : options.level;
};
class ChalkClass {
constructor(options) {
// eslint-disable-next-line no-constructor-return
return chalkFactory(options);
}
}
const chalkFactory = options => {
const chalk = {};
applyOptions(chalk, options);
chalk.template = (...arguments_) => chalkTag(chalk.template, ...arguments_);
Object.setPrototypeOf(chalk, Chalk.prototype);
Object.setPrototypeOf(chalk.template, chalk);
chalk.template.constructor = () => {
throw new Error('`chalk.constructor()` is deprecated. Use `new chalk.Instance()` instead.');
};
chalk.template.Instance = ChalkClass;
return chalk.template;
};
function Chalk(options) {
return chalkFactory(options);
}
for (const [styleName, style] of Object.entries(ansiStyles)) {
styles[styleName] = {
get() {
const builder = createBuilder(this, createStyler(style.open, style.close, this._styler), this._isEmpty);
Object.defineProperty(this, styleName, {value: builder});
return builder;
}
};
}
styles.visible = {
get() {
const builder = createBuilder(this, this._styler, true);
Object.defineProperty(this, 'visible', {value: builder});
return builder;
}
};
const usedModels = ['rgb', 'hex', 'keyword', 'hsl', 'hsv', 'hwb', 'ansi', 'ansi256'];
for (const model of usedModels) {
styles[model] = {
get() {
const {level} = this;
return function (...arguments_) {
const styler = createStyler(ansiStyles.color[levelMapping[level]][model](...arguments_), ansiStyles.color.close, this._styler);
return createBuilder(this, styler, this._isEmpty);
};
}
};
}
for (const model of usedModels) {
const bgModel = 'bg' + model[0].toUpperCase() + model.slice(1);
styles[bgModel] = {
get() {
const {level} = this;
return function (...arguments_) {
const styler = createStyler(ansiStyles.bgColor[levelMapping[level]][model](...arguments_), ansiStyles.bgColor.close, this._styler);
return createBuilder(this, styler, this._isEmpty);
};
}
};
}
const proto = Object.defineProperties(() => {}, {
...styles,
level: {
enumerable: true,
get() {
return this._generator.level;
},
set(level) {
this._generator.level = level;
}
}
});
const createStyler = (open, close, parent) => {
let openAll;
let closeAll;
if (parent === undefined) {
openAll = open;
closeAll = close;
} else {
openAll = parent.openAll + open;
closeAll = close + parent.closeAll;
}
return {
open,
close,
openAll,
closeAll,
parent
};
};
const createBuilder = (self, _styler, _isEmpty) => {
const builder = (...arguments_) => {
if (isArray(arguments_[0]) && isArray(arguments_[0].raw)) {
// Called as a template literal, for example: chalk.red`2 + 3 = {bold ${2+3}}`
return applyStyle(builder, chalkTag(builder, ...arguments_));
}
// Single argument is hot path, implicit coercion is faster than anything
// eslint-disable-next-line no-implicit-coercion
return applyStyle(builder, (arguments_.length === 1) ? ('' + arguments_[0]) : arguments_.join(' '));
};
// We alter the prototype because we must return a function, but there is
// no way to create a function with a different prototype
Object.setPrototypeOf(builder, proto);
builder._generator = self;
builder._styler = _styler;
builder._isEmpty = _isEmpty;
return builder;
};
const applyStyle = (self, string) => {
if (self.level <= 0 || !string) {
return self._isEmpty ? '' : string;
}
let styler = self._styler;
if (styler === undefined) {
return string;
}
const {openAll, closeAll} = styler;
if (string.indexOf('\u001B') !== -1) {
while (styler !== undefined) {
// Replace any instances already present with a re-opening code
// otherwise only the part of the string until said closing code
// will be colored, and the rest will simply be 'plain'.
string = stringReplaceAll(string, styler.close, styler.open);
styler = styler.parent;
}
}
// We can move both next actions out of loop, because remaining actions in loop won't have
// any/visible effect on parts we add here. Close the styling before a linebreak and reopen
// after next line to fix a bleed issue on macOS: https://github.com/chalk/chalk/pull/92
const lfIndex = string.indexOf('\n');
if (lfIndex !== -1) {
string = stringEncaseCRLFWithFirstIndex(string, closeAll, openAll, lfIndex);
}
return openAll + string + closeAll;
};
let template;
const chalkTag = (chalk, ...strings) => {
const [firstString] = strings;
if (!isArray(firstString) || !isArray(firstString.raw)) {
// If chalk() was called by itself or with a string,
// return the string itself as a string.
return strings.join(' ');
}
const arguments_ = strings.slice(1);
const parts = [firstString.raw[0]];
for (let i = 1; i < firstString.length; i++) {
parts.push(
String(arguments_[i - 1]).replace(/[{}\\]/g, '\\$&'),
String(firstString.raw[i])
);
}
if (template === undefined) {
template = require('./templates');
}
return template(chalk, parts.join(''));
};
Object.defineProperties(Chalk.prototype, styles);
const chalk = Chalk(); // eslint-disable-line new-cap
chalk.supportsColor = stdoutColor;
chalk.stderr = Chalk({level: stderrColor ? stderrColor.level : 0}); // eslint-disable-line new-cap
chalk.stderr.supportsColor = stderrColor;
module.exports = chalk;

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'use strict';
const TEMPLATE_REGEX = /(?:\\(u(?:[a-f\d]{4}|\{[a-f\d]{1,6}\})|x[a-f\d]{2}|.))|(?:\{(~)?(\w+(?:\([^)]*\))?(?:\.\w+(?:\([^)]*\))?)*)(?:[ \t]|(?=\r?\n)))|(\})|((?:.|[\r\n\f])+?)/gi;
const STYLE_REGEX = /(?:^|\.)(\w+)(?:\(([^)]*)\))?/g;
const STRING_REGEX = /^(['"])((?:\\.|(?!\1)[^\\])*)\1$/;
const ESCAPE_REGEX = /\\(u(?:[a-f\d]{4}|{[a-f\d]{1,6}})|x[a-f\d]{2}|.)|([^\\])/gi;
const ESCAPES = new Map([
['n', '\n'],
['r', '\r'],
['t', '\t'],
['b', '\b'],
['f', '\f'],
['v', '\v'],
['0', '\0'],
['\\', '\\'],
['e', '\u001B'],
['a', '\u0007']
]);
function unescape(c) {
const u = c[0] === 'u';
const bracket = c[1] === '{';
if ((u && !bracket && c.length === 5) || (c[0] === 'x' && c.length === 3)) {
return String.fromCharCode(parseInt(c.slice(1), 16));
}
if (u && bracket) {
return String.fromCodePoint(parseInt(c.slice(2, -1), 16));
}
return ESCAPES.get(c) || c;
}
function parseArguments(name, arguments_) {
const results = [];
const chunks = arguments_.trim().split(/\s*,\s*/g);
let matches;
for (const chunk of chunks) {
const number = Number(chunk);
if (!Number.isNaN(number)) {
results.push(number);
} else if ((matches = chunk.match(STRING_REGEX))) {
results.push(matches[2].replace(ESCAPE_REGEX, (m, escape, character) => escape ? unescape(escape) : character));
} else {
throw new Error(`Invalid Chalk template style argument: ${chunk} (in style '${name}')`);
}
}
return results;
}
function parseStyle(style) {
STYLE_REGEX.lastIndex = 0;
const results = [];
let matches;
while ((matches = STYLE_REGEX.exec(style)) !== null) {
const name = matches[1];
if (matches[2]) {
const args = parseArguments(name, matches[2]);
results.push([name].concat(args));
} else {
results.push([name]);
}
}
return results;
}
function buildStyle(chalk, styles) {
const enabled = {};
for (const layer of styles) {
for (const style of layer.styles) {
enabled[style[0]] = layer.inverse ? null : style.slice(1);
}
}
let current = chalk;
for (const [styleName, styles] of Object.entries(enabled)) {
if (!Array.isArray(styles)) {
continue;
}
if (!(styleName in current)) {
throw new Error(`Unknown Chalk style: ${styleName}`);
}
current = styles.length > 0 ? current[styleName](...styles) : current[styleName];
}
return current;
}
module.exports = (chalk, temporary) => {
const styles = [];
const chunks = [];
let chunk = [];
// eslint-disable-next-line max-params
temporary.replace(TEMPLATE_REGEX, (m, escapeCharacter, inverse, style, close, character) => {
if (escapeCharacter) {
chunk.push(unescape(escapeCharacter));
} else if (style) {
const string = chunk.join('');
chunk = [];
chunks.push(styles.length === 0 ? string : buildStyle(chalk, styles)(string));
styles.push({inverse, styles: parseStyle(style)});
} else if (close) {
if (styles.length === 0) {
throw new Error('Found extraneous } in Chalk template literal');
}
chunks.push(buildStyle(chalk, styles)(chunk.join('')));
chunk = [];
styles.pop();
} else {
chunk.push(character);
}
});
chunks.push(chunk.join(''));
if (styles.length > 0) {
const errMessage = `Chalk template literal is missing ${styles.length} closing bracket${styles.length === 1 ? '' : 's'} (\`}\`)`;
throw new Error(errMessage);
}
return chunks.join('');
};

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'use strict';
const stringReplaceAll = (string, substring, replacer) => {
let index = string.indexOf(substring);
if (index === -1) {
return string;
}
const substringLength = substring.length;
let endIndex = 0;
let returnValue = '';
do {
returnValue += string.substr(endIndex, index - endIndex) + substring + replacer;
endIndex = index + substringLength;
index = string.indexOf(substring, endIndex);
} while (index !== -1);
returnValue += string.substr(endIndex);
return returnValue;
};
const stringEncaseCRLFWithFirstIndex = (string, prefix, postfix, index) => {
let endIndex = 0;
let returnValue = '';
do {
const gotCR = string[index - 1] === '\r';
returnValue += string.substr(endIndex, (gotCR ? index - 1 : index) - endIndex) + prefix + (gotCR ? '\r\n' : '\n') + postfix;
endIndex = index + 1;
index = string.indexOf('\n', endIndex);
} while (index !== -1);
returnValue += string.substr(endIndex);
return returnValue;
};
module.exports = {
stringReplaceAll,
stringEncaseCRLFWithFirstIndex
};

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# 1.0.0 - 2016-01-07
- Removed: unused speed test
- Added: Automatic routing between previously unsupported conversions
([#27](https://github.com/Qix-/color-convert/pull/27))
- Removed: `xxx2xxx()` and `xxx2xxxRaw()` functions
([#27](https://github.com/Qix-/color-convert/pull/27))
- Removed: `convert()` class
([#27](https://github.com/Qix-/color-convert/pull/27))
- Changed: all functions to lookup dictionary
([#27](https://github.com/Qix-/color-convert/pull/27))
- Changed: `ansi` to `ansi256`
([#27](https://github.com/Qix-/color-convert/pull/27))
- Fixed: argument grouping for functions requiring only one argument
([#27](https://github.com/Qix-/color-convert/pull/27))
# 0.6.0 - 2015-07-23
- Added: methods to handle
[ANSI](https://en.wikipedia.org/wiki/ANSI_escape_code#Colors) 16/256 colors:
- rgb2ansi16
- rgb2ansi
- hsl2ansi16
- hsl2ansi
- hsv2ansi16
- hsv2ansi
- hwb2ansi16
- hwb2ansi
- cmyk2ansi16
- cmyk2ansi
- keyword2ansi16
- keyword2ansi
- ansi162rgb
- ansi162hsl
- ansi162hsv
- ansi162hwb
- ansi162cmyk
- ansi162keyword
- ansi2rgb
- ansi2hsl
- ansi2hsv
- ansi2hwb
- ansi2cmyk
- ansi2keyword
([#18](https://github.com/harthur/color-convert/pull/18))
# 0.5.3 - 2015-06-02
- Fixed: hsl2hsv does not return `NaN` anymore when using `[0,0,0]`
([#15](https://github.com/harthur/color-convert/issues/15))
---
Check out commit logs for older releases

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Copyright (c) 2011-2016 Heather Arthur <fayearthur@gmail.com>
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# color-convert
[![Build Status](https://travis-ci.org/Qix-/color-convert.svg?branch=master)](https://travis-ci.org/Qix-/color-convert)
Color-convert is a color conversion library for JavaScript and node.
It converts all ways between `rgb`, `hsl`, `hsv`, `hwb`, `cmyk`, `ansi`, `ansi16`, `hex` strings, and CSS `keyword`s (will round to closest):
```js
var convert = require('color-convert');
convert.rgb.hsl(140, 200, 100); // [96, 48, 59]
convert.keyword.rgb('blue'); // [0, 0, 255]
var rgbChannels = convert.rgb.channels; // 3
var cmykChannels = convert.cmyk.channels; // 4
var ansiChannels = convert.ansi16.channels; // 1
```
# Install
```console
$ npm install color-convert
```
# API
Simply get the property of the _from_ and _to_ conversion that you're looking for.
All functions have a rounded and unrounded variant. By default, return values are rounded. To get the unrounded (raw) results, simply tack on `.raw` to the function.
All 'from' functions have a hidden property called `.channels` that indicates the number of channels the function expects (not including alpha).
```js
var convert = require('color-convert');
// Hex to LAB
convert.hex.lab('DEADBF'); // [ 76, 21, -2 ]
convert.hex.lab.raw('DEADBF'); // [ 75.56213190997677, 20.653827952644754, -2.290532499330533 ]
// RGB to CMYK
convert.rgb.cmyk(167, 255, 4); // [ 35, 0, 98, 0 ]
convert.rgb.cmyk.raw(167, 255, 4); // [ 34.509803921568626, 0, 98.43137254901961, 0 ]
```
### Arrays
All functions that accept multiple arguments also support passing an array.
Note that this does **not** apply to functions that convert from a color that only requires one value (e.g. `keyword`, `ansi256`, `hex`, etc.)
```js
var convert = require('color-convert');
convert.rgb.hex(123, 45, 67); // '7B2D43'
convert.rgb.hex([123, 45, 67]); // '7B2D43'
```
## Routing
Conversions that don't have an _explicitly_ defined conversion (in [conversions.js](conversions.js)), but can be converted by means of sub-conversions (e.g. XYZ -> **RGB** -> CMYK), are automatically routed together. This allows just about any color model supported by `color-convert` to be converted to any other model, so long as a sub-conversion path exists. This is also true for conversions requiring more than one step in between (e.g. LCH -> **LAB** -> **XYZ** -> **RGB** -> Hex).
Keep in mind that extensive conversions _may_ result in a loss of precision, and exist only to be complete. For a list of "direct" (single-step) conversions, see [conversions.js](conversions.js).
# Contribute
If there is a new model you would like to support, or want to add a direct conversion between two existing models, please send us a pull request.
# License
Copyright &copy; 2011-2016, Heather Arthur and Josh Junon. Licensed under the [MIT License](LICENSE).

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/* MIT license */
/* eslint-disable no-mixed-operators */
const cssKeywords = require('color-name');
// NOTE: conversions should only return primitive values (i.e. arrays, or
// values that give correct `typeof` results).
// do not use box values types (i.e. Number(), String(), etc.)
const reverseKeywords = {};
for (const key of Object.keys(cssKeywords)) {
reverseKeywords[cssKeywords[key]] = key;
}
const convert = {
rgb: {channels: 3, labels: 'rgb'},
hsl: {channels: 3, labels: 'hsl'},
hsv: {channels: 3, labels: 'hsv'},
hwb: {channels: 3, labels: 'hwb'},
cmyk: {channels: 4, labels: 'cmyk'},
xyz: {channels: 3, labels: 'xyz'},
lab: {channels: 3, labels: 'lab'},
lch: {channels: 3, labels: 'lch'},
hex: {channels: 1, labels: ['hex']},
keyword: {channels: 1, labels: ['keyword']},
ansi16: {channels: 1, labels: ['ansi16']},
ansi256: {channels: 1, labels: ['ansi256']},
hcg: {channels: 3, labels: ['h', 'c', 'g']},
apple: {channels: 3, labels: ['r16', 'g16', 'b16']},
gray: {channels: 1, labels: ['gray']}
};
module.exports = convert;
// Hide .channels and .labels properties
for (const model of Object.keys(convert)) {
if (!('channels' in convert[model])) {
throw new Error('missing channels property: ' + model);
}
if (!('labels' in convert[model])) {
throw new Error('missing channel labels property: ' + model);
}
if (convert[model].labels.length !== convert[model].channels) {
throw new Error('channel and label counts mismatch: ' + model);
}
const {channels, labels} = convert[model];
delete convert[model].channels;
delete convert[model].labels;
Object.defineProperty(convert[model], 'channels', {value: channels});
Object.defineProperty(convert[model], 'labels', {value: labels});
}
convert.rgb.hsl = function (rgb) {
const r = rgb[0] / 255;
const g = rgb[1] / 255;
const b = rgb[2] / 255;
const min = Math.min(r, g, b);
const max = Math.max(r, g, b);
const delta = max - min;
let h;
let s;
if (max === min) {
h = 0;
} else if (r === max) {
h = (g - b) / delta;
} else if (g === max) {
h = 2 + (b - r) / delta;
} else if (b === max) {
h = 4 + (r - g) / delta;
}
h = Math.min(h * 60, 360);
if (h < 0) {
h += 360;
}
const l = (min + max) / 2;
if (max === min) {
s = 0;
} else if (l <= 0.5) {
s = delta / (max + min);
} else {
s = delta / (2 - max - min);
}
return [h, s * 100, l * 100];
};
convert.rgb.hsv = function (rgb) {
let rdif;
let gdif;
let bdif;
let h;
let s;
const r = rgb[0] / 255;
const g = rgb[1] / 255;
const b = rgb[2] / 255;
const v = Math.max(r, g, b);
const diff = v - Math.min(r, g, b);
const diffc = function (c) {
return (v - c) / 6 / diff + 1 / 2;
};
if (diff === 0) {
h = 0;
s = 0;
} else {
s = diff / v;
rdif = diffc(r);
gdif = diffc(g);
bdif = diffc(b);
if (r === v) {
h = bdif - gdif;
} else if (g === v) {
h = (1 / 3) + rdif - bdif;
} else if (b === v) {
h = (2 / 3) + gdif - rdif;
}
if (h < 0) {
h += 1;
} else if (h > 1) {
h -= 1;
}
}
return [
h * 360,
s * 100,
v * 100
];
};
convert.rgb.hwb = function (rgb) {
const r = rgb[0];
const g = rgb[1];
let b = rgb[2];
const h = convert.rgb.hsl(rgb)[0];
const w = 1 / 255 * Math.min(r, Math.min(g, b));
b = 1 - 1 / 255 * Math.max(r, Math.max(g, b));
return [h, w * 100, b * 100];
};
convert.rgb.cmyk = function (rgb) {
const r = rgb[0] / 255;
const g = rgb[1] / 255;
const b = rgb[2] / 255;
const k = Math.min(1 - r, 1 - g, 1 - b);
const c = (1 - r - k) / (1 - k) || 0;
const m = (1 - g - k) / (1 - k) || 0;
const y = (1 - b - k) / (1 - k) || 0;
return [c * 100, m * 100, y * 100, k * 100];
};
function comparativeDistance(x, y) {
/*
See https://en.m.wikipedia.org/wiki/Euclidean_distance#Squared_Euclidean_distance
*/
return (
((x[0] - y[0]) ** 2) +
((x[1] - y[1]) ** 2) +
((x[2] - y[2]) ** 2)
);
}
convert.rgb.keyword = function (rgb) {
const reversed = reverseKeywords[rgb];
if (reversed) {
return reversed;
}
let currentClosestDistance = Infinity;
let currentClosestKeyword;
for (const keyword of Object.keys(cssKeywords)) {
const value = cssKeywords[keyword];
// Compute comparative distance
const distance = comparativeDistance(rgb, value);
// Check if its less, if so set as closest
if (distance < currentClosestDistance) {
currentClosestDistance = distance;
currentClosestKeyword = keyword;
}
}
return currentClosestKeyword;
};
convert.keyword.rgb = function (keyword) {
return cssKeywords[keyword];
};
convert.rgb.xyz = function (rgb) {
let r = rgb[0] / 255;
let g = rgb[1] / 255;
let b = rgb[2] / 255;
// Assume sRGB
r = r > 0.04045 ? (((r + 0.055) / 1.055) ** 2.4) : (r / 12.92);
g = g > 0.04045 ? (((g + 0.055) / 1.055) ** 2.4) : (g / 12.92);
b = b > 0.04045 ? (((b + 0.055) / 1.055) ** 2.4) : (b / 12.92);
const x = (r * 0.4124) + (g * 0.3576) + (b * 0.1805);
const y = (r * 0.2126) + (g * 0.7152) + (b * 0.0722);
const z = (r * 0.0193) + (g * 0.1192) + (b * 0.9505);
return [x * 100, y * 100, z * 100];
};
convert.rgb.lab = function (rgb) {
const xyz = convert.rgb.xyz(rgb);
let x = xyz[0];
let y = xyz[1];
let z = xyz[2];
x /= 95.047;
y /= 100;
z /= 108.883;
x = x > 0.008856 ? (x ** (1 / 3)) : (7.787 * x) + (16 / 116);
y = y > 0.008856 ? (y ** (1 / 3)) : (7.787 * y) + (16 / 116);
z = z > 0.008856 ? (z ** (1 / 3)) : (7.787 * z) + (16 / 116);
const l = (116 * y) - 16;
const a = 500 * (x - y);
const b = 200 * (y - z);
return [l, a, b];
};
convert.hsl.rgb = function (hsl) {
const h = hsl[0] / 360;
const s = hsl[1] / 100;
const l = hsl[2] / 100;
let t2;
let t3;
let val;
if (s === 0) {
val = l * 255;
return [val, val, val];
}
if (l < 0.5) {
t2 = l * (1 + s);
} else {
t2 = l + s - l * s;
}
const t1 = 2 * l - t2;
const rgb = [0, 0, 0];
for (let i = 0; i < 3; i++) {
t3 = h + 1 / 3 * -(i - 1);
if (t3 < 0) {
t3++;
}
if (t3 > 1) {
t3--;
}
if (6 * t3 < 1) {
val = t1 + (t2 - t1) * 6 * t3;
} else if (2 * t3 < 1) {
val = t2;
} else if (3 * t3 < 2) {
val = t1 + (t2 - t1) * (2 / 3 - t3) * 6;
} else {
val = t1;
}
rgb[i] = val * 255;
}
return rgb;
};
convert.hsl.hsv = function (hsl) {
const h = hsl[0];
let s = hsl[1] / 100;
let l = hsl[2] / 100;
let smin = s;
const lmin = Math.max(l, 0.01);
l *= 2;
s *= (l <= 1) ? l : 2 - l;
smin *= lmin <= 1 ? lmin : 2 - lmin;
const v = (l + s) / 2;
const sv = l === 0 ? (2 * smin) / (lmin + smin) : (2 * s) / (l + s);
return [h, sv * 100, v * 100];
};
convert.hsv.rgb = function (hsv) {
const h = hsv[0] / 60;
const s = hsv[1] / 100;
let v = hsv[2] / 100;
const hi = Math.floor(h) % 6;
const f = h - Math.floor(h);
const p = 255 * v * (1 - s);
const q = 255 * v * (1 - (s * f));
const t = 255 * v * (1 - (s * (1 - f)));
v *= 255;
switch (hi) {
case 0:
return [v, t, p];
case 1:
return [q, v, p];
case 2:
return [p, v, t];
case 3:
return [p, q, v];
case 4:
return [t, p, v];
case 5:
return [v, p, q];
}
};
convert.hsv.hsl = function (hsv) {
const h = hsv[0];
const s = hsv[1] / 100;
const v = hsv[2] / 100;
const vmin = Math.max(v, 0.01);
let sl;
let l;
l = (2 - s) * v;
const lmin = (2 - s) * vmin;
sl = s * vmin;
sl /= (lmin <= 1) ? lmin : 2 - lmin;
sl = sl || 0;
l /= 2;
return [h, sl * 100, l * 100];
};
// http://dev.w3.org/csswg/css-color/#hwb-to-rgb
convert.hwb.rgb = function (hwb) {
const h = hwb[0] / 360;
let wh = hwb[1] / 100;
let bl = hwb[2] / 100;
const ratio = wh + bl;
let f;
// Wh + bl cant be > 1
if (ratio > 1) {
wh /= ratio;
bl /= ratio;
}
const i = Math.floor(6 * h);
const v = 1 - bl;
f = 6 * h - i;
if ((i & 0x01) !== 0) {
f = 1 - f;
}
const n = wh + f * (v - wh); // Linear interpolation
let r;
let g;
let b;
/* eslint-disable max-statements-per-line,no-multi-spaces */
switch (i) {
default:
case 6:
case 0: r = v; g = n; b = wh; break;
case 1: r = n; g = v; b = wh; break;
case 2: r = wh; g = v; b = n; break;
case 3: r = wh; g = n; b = v; break;
case 4: r = n; g = wh; b = v; break;
case 5: r = v; g = wh; b = n; break;
}
/* eslint-enable max-statements-per-line,no-multi-spaces */
return [r * 255, g * 255, b * 255];
};
convert.cmyk.rgb = function (cmyk) {
const c = cmyk[0] / 100;
const m = cmyk[1] / 100;
const y = cmyk[2] / 100;
const k = cmyk[3] / 100;
const r = 1 - Math.min(1, c * (1 - k) + k);
const g = 1 - Math.min(1, m * (1 - k) + k);
const b = 1 - Math.min(1, y * (1 - k) + k);
return [r * 255, g * 255, b * 255];
};
convert.xyz.rgb = function (xyz) {
const x = xyz[0] / 100;
const y = xyz[1] / 100;
const z = xyz[2] / 100;
let r;
let g;
let b;
r = (x * 3.2406) + (y * -1.5372) + (z * -0.4986);
g = (x * -0.9689) + (y * 1.8758) + (z * 0.0415);
b = (x * 0.0557) + (y * -0.2040) + (z * 1.0570);
// Assume sRGB
r = r > 0.0031308
? ((1.055 * (r ** (1.0 / 2.4))) - 0.055)
: r * 12.92;
g = g > 0.0031308
? ((1.055 * (g ** (1.0 / 2.4))) - 0.055)
: g * 12.92;
b = b > 0.0031308
? ((1.055 * (b ** (1.0 / 2.4))) - 0.055)
: b * 12.92;
r = Math.min(Math.max(0, r), 1);
g = Math.min(Math.max(0, g), 1);
b = Math.min(Math.max(0, b), 1);
return [r * 255, g * 255, b * 255];
};
convert.xyz.lab = function (xyz) {
let x = xyz[0];
let y = xyz[1];
let z = xyz[2];
x /= 95.047;
y /= 100;
z /= 108.883;
x = x > 0.008856 ? (x ** (1 / 3)) : (7.787 * x) + (16 / 116);
y = y > 0.008856 ? (y ** (1 / 3)) : (7.787 * y) + (16 / 116);
z = z > 0.008856 ? (z ** (1 / 3)) : (7.787 * z) + (16 / 116);
const l = (116 * y) - 16;
const a = 500 * (x - y);
const b = 200 * (y - z);
return [l, a, b];
};
convert.lab.xyz = function (lab) {
const l = lab[0];
const a = lab[1];
const b = lab[2];
let x;
let y;
let z;
y = (l + 16) / 116;
x = a / 500 + y;
z = y - b / 200;
const y2 = y ** 3;
const x2 = x ** 3;
const z2 = z ** 3;
y = y2 > 0.008856 ? y2 : (y - 16 / 116) / 7.787;
x = x2 > 0.008856 ? x2 : (x - 16 / 116) / 7.787;
z = z2 > 0.008856 ? z2 : (z - 16 / 116) / 7.787;
x *= 95.047;
y *= 100;
z *= 108.883;
return [x, y, z];
};
convert.lab.lch = function (lab) {
const l = lab[0];
const a = lab[1];
const b = lab[2];
let h;
const hr = Math.atan2(b, a);
h = hr * 360 / 2 / Math.PI;
if (h < 0) {
h += 360;
}
const c = Math.sqrt(a * a + b * b);
return [l, c, h];
};
convert.lch.lab = function (lch) {
const l = lch[0];
const c = lch[1];
const h = lch[2];
const hr = h / 360 * 2 * Math.PI;
const a = c * Math.cos(hr);
const b = c * Math.sin(hr);
return [l, a, b];
};
convert.rgb.ansi16 = function (args, saturation = null) {
const [r, g, b] = args;
let value = saturation === null ? convert.rgb.hsv(args)[2] : saturation; // Hsv -> ansi16 optimization
value = Math.round(value / 50);
if (value === 0) {
return 30;
}
let ansi = 30
+ ((Math.round(b / 255) << 2)
| (Math.round(g / 255) << 1)
| Math.round(r / 255));
if (value === 2) {
ansi += 60;
}
return ansi;
};
convert.hsv.ansi16 = function (args) {
// Optimization here; we already know the value and don't need to get
// it converted for us.
return convert.rgb.ansi16(convert.hsv.rgb(args), args[2]);
};
convert.rgb.ansi256 = function (args) {
const r = args[0];
const g = args[1];
const b = args[2];
// We use the extended greyscale palette here, with the exception of
// black and white. normal palette only has 4 greyscale shades.
if (r === g && g === b) {
if (r < 8) {
return 16;
}
if (r > 248) {
return 231;
}
return Math.round(((r - 8) / 247) * 24) + 232;
}
const ansi = 16
+ (36 * Math.round(r / 255 * 5))
+ (6 * Math.round(g / 255 * 5))
+ Math.round(b / 255 * 5);
return ansi;
};
convert.ansi16.rgb = function (args) {
let color = args % 10;
// Handle greyscale
if (color === 0 || color === 7) {
if (args > 50) {
color += 3.5;
}
color = color / 10.5 * 255;
return [color, color, color];
}
const mult = (~~(args > 50) + 1) * 0.5;
const r = ((color & 1) * mult) * 255;
const g = (((color >> 1) & 1) * mult) * 255;
const b = (((color >> 2) & 1) * mult) * 255;
return [r, g, b];
};
convert.ansi256.rgb = function (args) {
// Handle greyscale
if (args >= 232) {
const c = (args - 232) * 10 + 8;
return [c, c, c];
}
args -= 16;
let rem;
const r = Math.floor(args / 36) / 5 * 255;
const g = Math.floor((rem = args % 36) / 6) / 5 * 255;
const b = (rem % 6) / 5 * 255;
return [r, g, b];
};
convert.rgb.hex = function (args) {
const integer = ((Math.round(args[0]) & 0xFF) << 16)
+ ((Math.round(args[1]) & 0xFF) << 8)
+ (Math.round(args[2]) & 0xFF);
const string = integer.toString(16).toUpperCase();
return '000000'.substring(string.length) + string;
};
convert.hex.rgb = function (args) {
const match = args.toString(16).match(/[a-f0-9]{6}|[a-f0-9]{3}/i);
if (!match) {
return [0, 0, 0];
}
let colorString = match[0];
if (match[0].length === 3) {
colorString = colorString.split('').map(char => {
return char + char;
}).join('');
}
const integer = parseInt(colorString, 16);
const r = (integer >> 16) & 0xFF;
const g = (integer >> 8) & 0xFF;
const b = integer & 0xFF;
return [r, g, b];
};
convert.rgb.hcg = function (rgb) {
const r = rgb[0] / 255;
const g = rgb[1] / 255;
const b = rgb[2] / 255;
const max = Math.max(Math.max(r, g), b);
const min = Math.min(Math.min(r, g), b);
const chroma = (max - min);
let grayscale;
let hue;
if (chroma < 1) {
grayscale = min / (1 - chroma);
} else {
grayscale = 0;
}
if (chroma <= 0) {
hue = 0;
} else
if (max === r) {
hue = ((g - b) / chroma) % 6;
} else
if (max === g) {
hue = 2 + (b - r) / chroma;
} else {
hue = 4 + (r - g) / chroma;
}
hue /= 6;
hue %= 1;
return [hue * 360, chroma * 100, grayscale * 100];
};
convert.hsl.hcg = function (hsl) {
const s = hsl[1] / 100;
const l = hsl[2] / 100;
const c = l < 0.5 ? (2.0 * s * l) : (2.0 * s * (1.0 - l));
let f = 0;
if (c < 1.0) {
f = (l - 0.5 * c) / (1.0 - c);
}
return [hsl[0], c * 100, f * 100];
};
convert.hsv.hcg = function (hsv) {
const s = hsv[1] / 100;
const v = hsv[2] / 100;
const c = s * v;
let f = 0;
if (c < 1.0) {
f = (v - c) / (1 - c);
}
return [hsv[0], c * 100, f * 100];
};
convert.hcg.rgb = function (hcg) {
const h = hcg[0] / 360;
const c = hcg[1] / 100;
const g = hcg[2] / 100;
if (c === 0.0) {
return [g * 255, g * 255, g * 255];
}
const pure = [0, 0, 0];
const hi = (h % 1) * 6;
const v = hi % 1;
const w = 1 - v;
let mg = 0;
/* eslint-disable max-statements-per-line */
switch (Math.floor(hi)) {
case 0:
pure[0] = 1; pure[1] = v; pure[2] = 0; break;
case 1:
pure[0] = w; pure[1] = 1; pure[2] = 0; break;
case 2:
pure[0] = 0; pure[1] = 1; pure[2] = v; break;
case 3:
pure[0] = 0; pure[1] = w; pure[2] = 1; break;
case 4:
pure[0] = v; pure[1] = 0; pure[2] = 1; break;
default:
pure[0] = 1; pure[1] = 0; pure[2] = w;
}
/* eslint-enable max-statements-per-line */
mg = (1.0 - c) * g;
return [
(c * pure[0] + mg) * 255,
(c * pure[1] + mg) * 255,
(c * pure[2] + mg) * 255
];
};
convert.hcg.hsv = function (hcg) {
const c = hcg[1] / 100;
const g = hcg[2] / 100;
const v = c + g * (1.0 - c);
let f = 0;
if (v > 0.0) {
f = c / v;
}
return [hcg[0], f * 100, v * 100];
};
convert.hcg.hsl = function (hcg) {
const c = hcg[1] / 100;
const g = hcg[2] / 100;
const l = g * (1.0 - c) + 0.5 * c;
let s = 0;
if (l > 0.0 && l < 0.5) {
s = c / (2 * l);
} else
if (l >= 0.5 && l < 1.0) {
s = c / (2 * (1 - l));
}
return [hcg[0], s * 100, l * 100];
};
convert.hcg.hwb = function (hcg) {
const c = hcg[1] / 100;
const g = hcg[2] / 100;
const v = c + g * (1.0 - c);
return [hcg[0], (v - c) * 100, (1 - v) * 100];
};
convert.hwb.hcg = function (hwb) {
const w = hwb[1] / 100;
const b = hwb[2] / 100;
const v = 1 - b;
const c = v - w;
let g = 0;
if (c < 1) {
g = (v - c) / (1 - c);
}
return [hwb[0], c * 100, g * 100];
};
convert.apple.rgb = function (apple) {
return [(apple[0] / 65535) * 255, (apple[1] / 65535) * 255, (apple[2] / 65535) * 255];
};
convert.rgb.apple = function (rgb) {
return [(rgb[0] / 255) * 65535, (rgb[1] / 255) * 65535, (rgb[2] / 255) * 65535];
};
convert.gray.rgb = function (args) {
return [args[0] / 100 * 255, args[0] / 100 * 255, args[0] / 100 * 255];
};
convert.gray.hsl = function (args) {
return [0, 0, args[0]];
};
convert.gray.hsv = convert.gray.hsl;
convert.gray.hwb = function (gray) {
return [0, 100, gray[0]];
};
convert.gray.cmyk = function (gray) {
return [0, 0, 0, gray[0]];
};
convert.gray.lab = function (gray) {
return [gray[0], 0, 0];
};
convert.gray.hex = function (gray) {
const val = Math.round(gray[0] / 100 * 255) & 0xFF;
const integer = (val << 16) + (val << 8) + val;
const string = integer.toString(16).toUpperCase();
return '000000'.substring(string.length) + string;
};
convert.rgb.gray = function (rgb) {
const val = (rgb[0] + rgb[1] + rgb[2]) / 3;
return [val / 255 * 100];
};

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const conversions = require('./conversions');
const route = require('./route');
const convert = {};
const models = Object.keys(conversions);
function wrapRaw(fn) {
const wrappedFn = function (...args) {
const arg0 = args[0];
if (arg0 === undefined || arg0 === null) {
return arg0;
}
if (arg0.length > 1) {
args = arg0;
}
return fn(args);
};
// Preserve .conversion property if there is one
if ('conversion' in fn) {
wrappedFn.conversion = fn.conversion;
}
return wrappedFn;
}
function wrapRounded(fn) {
const wrappedFn = function (...args) {
const arg0 = args[0];
if (arg0 === undefined || arg0 === null) {
return arg0;
}
if (arg0.length > 1) {
args = arg0;
}
const result = fn(args);
// We're assuming the result is an array here.
// see notice in conversions.js; don't use box types
// in conversion functions.
if (typeof result === 'object') {
for (let len = result.length, i = 0; i < len; i++) {
result[i] = Math.round(result[i]);
}
}
return result;
};
// Preserve .conversion property if there is one
if ('conversion' in fn) {
wrappedFn.conversion = fn.conversion;
}
return wrappedFn;
}
models.forEach(fromModel => {
convert[fromModel] = {};
Object.defineProperty(convert[fromModel], 'channels', {value: conversions[fromModel].channels});
Object.defineProperty(convert[fromModel], 'labels', {value: conversions[fromModel].labels});
const routes = route(fromModel);
const routeModels = Object.keys(routes);
routeModels.forEach(toModel => {
const fn = routes[toModel];
convert[fromModel][toModel] = wrapRounded(fn);
convert[fromModel][toModel].raw = wrapRaw(fn);
});
});
module.exports = convert;

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{
"name": "color-convert",
"description": "Plain color conversion functions",
"version": "2.0.1",
"author": "Heather Arthur <fayearthur@gmail.com>",
"license": "MIT",
"repository": "Qix-/color-convert",
"scripts": {
"pretest": "xo",
"test": "node test/basic.js"
},
"engines": {
"node": ">=7.0.0"
},
"keywords": [
"color",
"colour",
"convert",
"converter",
"conversion",
"rgb",
"hsl",
"hsv",
"hwb",
"cmyk",
"ansi",
"ansi16"
],
"files": [
"index.js",
"conversions.js",
"route.js"
],
"xo": {
"rules": {
"default-case": 0,
"no-inline-comments": 0,
"operator-linebreak": 0
}
},
"devDependencies": {
"chalk": "^2.4.2",
"xo": "^0.24.0"
},
"dependencies": {
"color-name": "~1.1.4"
}
}

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const conversions = require('./conversions');
/*
This function routes a model to all other models.
all functions that are routed have a property `.conversion` attached
to the returned synthetic function. This property is an array
of strings, each with the steps in between the 'from' and 'to'
color models (inclusive).
conversions that are not possible simply are not included.
*/
function buildGraph() {
const graph = {};
// https://jsperf.com/object-keys-vs-for-in-with-closure/3
const models = Object.keys(conversions);
for (let len = models.length, i = 0; i < len; i++) {
graph[models[i]] = {
// http://jsperf.com/1-vs-infinity
// micro-opt, but this is simple.
distance: -1,
parent: null
};
}
return graph;
}
// https://en.wikipedia.org/wiki/Breadth-first_search
function deriveBFS(fromModel) {
const graph = buildGraph();
const queue = [fromModel]; // Unshift -> queue -> pop
graph[fromModel].distance = 0;
while (queue.length) {
const current = queue.pop();
const adjacents = Object.keys(conversions[current]);
for (let len = adjacents.length, i = 0; i < len; i++) {
const adjacent = adjacents[i];
const node = graph[adjacent];
if (node.distance === -1) {
node.distance = graph[current].distance + 1;
node.parent = current;
queue.unshift(adjacent);
}
}
}
return graph;
}
function link(from, to) {
return function (args) {
return to(from(args));
};
}
function wrapConversion(toModel, graph) {
const path = [graph[toModel].parent, toModel];
let fn = conversions[graph[toModel].parent][toModel];
let cur = graph[toModel].parent;
while (graph[cur].parent) {
path.unshift(graph[cur].parent);
fn = link(conversions[graph[cur].parent][cur], fn);
cur = graph[cur].parent;
}
fn.conversion = path;
return fn;
}
module.exports = function (fromModel) {
const graph = deriveBFS(fromModel);
const conversion = {};
const models = Object.keys(graph);
for (let len = models.length, i = 0; i < len; i++) {
const toModel = models[i];
const node = graph[toModel];
if (node.parent === null) {
// No possible conversion, or this node is the source model.
continue;
}
conversion[toModel] = wrapConversion(toModel, graph);
}
return conversion;
};

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The MIT License (MIT)
Copyright (c) 2015 Dmitry Ivanov
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

View file

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A JSON with color names and its values. Based on http://dev.w3.org/csswg/css-color/#named-colors.
[![NPM](https://nodei.co/npm/color-name.png?mini=true)](https://nodei.co/npm/color-name/)
```js
var colors = require('color-name');
colors.red //[255,0,0]
```
<a href="LICENSE"><img src="https://upload.wikimedia.org/wikipedia/commons/0/0c/MIT_logo.svg" width="120"/></a>

152
my-app/node_modules/critters/node_modules/color-name/index.js generated vendored Executable file
View file

@ -0,0 +1,152 @@
'use strict'
module.exports = {
"aliceblue": [240, 248, 255],
"antiquewhite": [250, 235, 215],
"aqua": [0, 255, 255],
"aquamarine": [127, 255, 212],
"azure": [240, 255, 255],
"beige": [245, 245, 220],
"bisque": [255, 228, 196],
"black": [0, 0, 0],
"blanchedalmond": [255, 235, 205],
"blue": [0, 0, 255],
"blueviolet": [138, 43, 226],
"brown": [165, 42, 42],
"burlywood": [222, 184, 135],
"cadetblue": [95, 158, 160],
"chartreuse": [127, 255, 0],
"chocolate": [210, 105, 30],
"coral": [255, 127, 80],
"cornflowerblue": [100, 149, 237],
"cornsilk": [255, 248, 220],
"crimson": [220, 20, 60],
"cyan": [0, 255, 255],
"darkblue": [0, 0, 139],
"darkcyan": [0, 139, 139],
"darkgoldenrod": [184, 134, 11],
"darkgray": [169, 169, 169],
"darkgreen": [0, 100, 0],
"darkgrey": [169, 169, 169],
"darkkhaki": [189, 183, 107],
"darkmagenta": [139, 0, 139],
"darkolivegreen": [85, 107, 47],
"darkorange": [255, 140, 0],
"darkorchid": [153, 50, 204],
"darkred": [139, 0, 0],
"darksalmon": [233, 150, 122],
"darkseagreen": [143, 188, 143],
"darkslateblue": [72, 61, 139],
"darkslategray": [47, 79, 79],
"darkslategrey": [47, 79, 79],
"darkturquoise": [0, 206, 209],
"darkviolet": [148, 0, 211],
"deeppink": [255, 20, 147],
"deepskyblue": [0, 191, 255],
"dimgray": [105, 105, 105],
"dimgrey": [105, 105, 105],
"dodgerblue": [30, 144, 255],
"firebrick": [178, 34, 34],
"floralwhite": [255, 250, 240],
"forestgreen": [34, 139, 34],
"fuchsia": [255, 0, 255],
"gainsboro": [220, 220, 220],
"ghostwhite": [248, 248, 255],
"gold": [255, 215, 0],
"goldenrod": [218, 165, 32],
"gray": [128, 128, 128],
"green": [0, 128, 0],
"greenyellow": [173, 255, 47],
"grey": [128, 128, 128],
"honeydew": [240, 255, 240],
"hotpink": [255, 105, 180],
"indianred": [205, 92, 92],
"indigo": [75, 0, 130],
"ivory": [255, 255, 240],
"khaki": [240, 230, 140],
"lavender": [230, 230, 250],
"lavenderblush": [255, 240, 245],
"lawngreen": [124, 252, 0],
"lemonchiffon": [255, 250, 205],
"lightblue": [173, 216, 230],
"lightcoral": [240, 128, 128],
"lightcyan": [224, 255, 255],
"lightgoldenrodyellow": [250, 250, 210],
"lightgray": [211, 211, 211],
"lightgreen": [144, 238, 144],
"lightgrey": [211, 211, 211],
"lightpink": [255, 182, 193],
"lightsalmon": [255, 160, 122],
"lightseagreen": [32, 178, 170],
"lightskyblue": [135, 206, 250],
"lightslategray": [119, 136, 153],
"lightslategrey": [119, 136, 153],
"lightsteelblue": [176, 196, 222],
"lightyellow": [255, 255, 224],
"lime": [0, 255, 0],
"limegreen": [50, 205, 50],
"linen": [250, 240, 230],
"magenta": [255, 0, 255],
"maroon": [128, 0, 0],
"mediumaquamarine": [102, 205, 170],
"mediumblue": [0, 0, 205],
"mediumorchid": [186, 85, 211],
"mediumpurple": [147, 112, 219],
"mediumseagreen": [60, 179, 113],
"mediumslateblue": [123, 104, 238],
"mediumspringgreen": [0, 250, 154],
"mediumturquoise": [72, 209, 204],
"mediumvioletred": [199, 21, 133],
"midnightblue": [25, 25, 112],
"mintcream": [245, 255, 250],
"mistyrose": [255, 228, 225],
"moccasin": [255, 228, 181],
"navajowhite": [255, 222, 173],
"navy": [0, 0, 128],
"oldlace": [253, 245, 230],
"olive": [128, 128, 0],
"olivedrab": [107, 142, 35],
"orange": [255, 165, 0],
"orangered": [255, 69, 0],
"orchid": [218, 112, 214],
"palegoldenrod": [238, 232, 170],
"palegreen": [152, 251, 152],
"paleturquoise": [175, 238, 238],
"palevioletred": [219, 112, 147],
"papayawhip": [255, 239, 213],
"peachpuff": [255, 218, 185],
"peru": [205, 133, 63],
"pink": [255, 192, 203],
"plum": [221, 160, 221],
"powderblue": [176, 224, 230],
"purple": [128, 0, 128],
"rebeccapurple": [102, 51, 153],
"red": [255, 0, 0],
"rosybrown": [188, 143, 143],
"royalblue": [65, 105, 225],
"saddlebrown": [139, 69, 19],
"salmon": [250, 128, 114],
"sandybrown": [244, 164, 96],
"seagreen": [46, 139, 87],
"seashell": [255, 245, 238],
"sienna": [160, 82, 45],
"silver": [192, 192, 192],
"skyblue": [135, 206, 235],
"slateblue": [106, 90, 205],
"slategray": [112, 128, 144],
"slategrey": [112, 128, 144],
"snow": [255, 250, 250],
"springgreen": [0, 255, 127],
"steelblue": [70, 130, 180],
"tan": [210, 180, 140],
"teal": [0, 128, 128],
"thistle": [216, 191, 216],
"tomato": [255, 99, 71],
"turquoise": [64, 224, 208],
"violet": [238, 130, 238],
"wheat": [245, 222, 179],
"white": [255, 255, 255],
"whitesmoke": [245, 245, 245],
"yellow": [255, 255, 0],
"yellowgreen": [154, 205, 50]
};

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{
"name": "color-name",
"version": "1.1.4",
"description": "A list of color names and its values",
"main": "index.js",
"files": [
"index.js"
],
"scripts": {
"test": "node test.js"
},
"repository": {
"type": "git",
"url": "git@github.com:colorjs/color-name.git"
},
"keywords": [
"color-name",
"color",
"color-keyword",
"keyword"
],
"author": "DY <dfcreative@gmail.com>",
"license": "MIT",
"bugs": {
"url": "https://github.com/colorjs/color-name/issues"
},
"homepage": "https://github.com/colorjs/color-name"
}

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/**
Check if [`argv`](https://nodejs.org/docs/latest/api/process.html#process_process_argv) has a specific flag.
@param flag - CLI flag to look for. The `--` prefix is optional.
@param argv - CLI arguments. Default: `process.argv`.
@returns Whether the flag exists.
@example
```
// $ ts-node foo.ts -f --unicorn --foo=bar -- --rainbow
// foo.ts
import hasFlag = require('has-flag');
hasFlag('unicorn');
//=> true
hasFlag('--unicorn');
//=> true
hasFlag('f');
//=> true
hasFlag('-f');
//=> true
hasFlag('foo=bar');
//=> true
hasFlag('foo');
//=> false
hasFlag('rainbow');
//=> false
```
*/
declare function hasFlag(flag: string, argv?: string[]): boolean;
export = hasFlag;

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'use strict';
module.exports = (flag, argv = process.argv) => {
const prefix = flag.startsWith('-') ? '' : (flag.length === 1 ? '-' : '--');
const position = argv.indexOf(prefix + flag);
const terminatorPosition = argv.indexOf('--');
return position !== -1 && (terminatorPosition === -1 || position < terminatorPosition);
};

9
my-app/node_modules/critters/node_modules/has-flag/license generated vendored Executable file
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@ -0,0 +1,9 @@
MIT License
Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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{
"name": "has-flag",
"version": "4.0.0",
"description": "Check if argv has a specific flag",
"license": "MIT",
"repository": "sindresorhus/has-flag",
"author": {
"name": "Sindre Sorhus",
"email": "sindresorhus@gmail.com",
"url": "sindresorhus.com"
},
"engines": {
"node": ">=8"
},
"scripts": {
"test": "xo && ava && tsd"
},
"files": [
"index.js",
"index.d.ts"
],
"keywords": [
"has",
"check",
"detect",
"contains",
"find",
"flag",
"cli",
"command-line",
"argv",
"process",
"arg",
"args",
"argument",
"arguments",
"getopt",
"minimist",
"optimist"
],
"devDependencies": {
"ava": "^1.4.1",
"tsd": "^0.7.2",
"xo": "^0.24.0"
}
}

89
my-app/node_modules/critters/node_modules/has-flag/readme.md generated vendored Executable file
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# has-flag [![Build Status](https://travis-ci.org/sindresorhus/has-flag.svg?branch=master)](https://travis-ci.org/sindresorhus/has-flag)
> Check if [`argv`](https://nodejs.org/docs/latest/api/process.html#process_process_argv) has a specific flag
Correctly stops looking after an `--` argument terminator.
---
<div align="center">
<b>
<a href="https://tidelift.com/subscription/pkg/npm-has-flag?utm_source=npm-has-flag&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a>
</b>
<br>
<sub>
Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
</sub>
</div>
---
## Install
```
$ npm install has-flag
```
## Usage
```js
// foo.js
const hasFlag = require('has-flag');
hasFlag('unicorn');
//=> true
hasFlag('--unicorn');
//=> true
hasFlag('f');
//=> true
hasFlag('-f');
//=> true
hasFlag('foo=bar');
//=> true
hasFlag('foo');
//=> false
hasFlag('rainbow');
//=> false
```
```
$ node foo.js -f --unicorn --foo=bar -- --rainbow
```
## API
### hasFlag(flag, [argv])
Returns a boolean for whether the flag exists.
#### flag
Type: `string`
CLI flag to look for. The `--` prefix is optional.
#### argv
Type: `string[]`<br>
Default: `process.argv`
CLI arguments.
## Security
To report a security vulnerability, please use the [Tidelift security contact](https://tidelift.com/security). Tidelift will coordinate the fix and disclosure.
## License
MIT © [Sindre Sorhus](https://sindresorhus.com)

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@ -0,0 +1,5 @@
'use strict';
module.exports = {
stdout: false,
stderr: false
};

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@ -0,0 +1,135 @@
'use strict';
const os = require('os');
const tty = require('tty');
const hasFlag = require('has-flag');
const {env} = process;
let forceColor;
if (hasFlag('no-color') ||
hasFlag('no-colors') ||
hasFlag('color=false') ||
hasFlag('color=never')) {
forceColor = 0;
} else if (hasFlag('color') ||
hasFlag('colors') ||
hasFlag('color=true') ||
hasFlag('color=always')) {
forceColor = 1;
}
if ('FORCE_COLOR' in env) {
if (env.FORCE_COLOR === 'true') {
forceColor = 1;
} else if (env.FORCE_COLOR === 'false') {
forceColor = 0;
} else {
forceColor = env.FORCE_COLOR.length === 0 ? 1 : Math.min(parseInt(env.FORCE_COLOR, 10), 3);
}
}
function translateLevel(level) {
if (level === 0) {
return false;
}
return {
level,
hasBasic: true,
has256: level >= 2,
has16m: level >= 3
};
}
function supportsColor(haveStream, streamIsTTY) {
if (forceColor === 0) {
return 0;
}
if (hasFlag('color=16m') ||
hasFlag('color=full') ||
hasFlag('color=truecolor')) {
return 3;
}
if (hasFlag('color=256')) {
return 2;
}
if (haveStream && !streamIsTTY && forceColor === undefined) {
return 0;
}
const min = forceColor || 0;
if (env.TERM === 'dumb') {
return min;
}
if (process.platform === 'win32') {
// Windows 10 build 10586 is the first Windows release that supports 256 colors.
// Windows 10 build 14931 is the first release that supports 16m/TrueColor.
const osRelease = os.release().split('.');
if (
Number(osRelease[0]) >= 10 &&
Number(osRelease[2]) >= 10586
) {
return Number(osRelease[2]) >= 14931 ? 3 : 2;
}
return 1;
}
if ('CI' in env) {
if (['TRAVIS', 'CIRCLECI', 'APPVEYOR', 'GITLAB_CI', 'GITHUB_ACTIONS', 'BUILDKITE'].some(sign => sign in env) || env.CI_NAME === 'codeship') {
return 1;
}
return min;
}
if ('TEAMCITY_VERSION' in env) {
return /^(9\.(0*[1-9]\d*)\.|\d{2,}\.)/.test(env.TEAMCITY_VERSION) ? 1 : 0;
}
if (env.COLORTERM === 'truecolor') {
return 3;
}
if ('TERM_PROGRAM' in env) {
const version = parseInt((env.TERM_PROGRAM_VERSION || '').split('.')[0], 10);
switch (env.TERM_PROGRAM) {
case 'iTerm.app':
return version >= 3 ? 3 : 2;
case 'Apple_Terminal':
return 2;
// No default
}
}
if (/-256(color)?$/i.test(env.TERM)) {
return 2;
}
if (/^screen|^xterm|^vt100|^vt220|^rxvt|color|ansi|cygwin|linux/i.test(env.TERM)) {
return 1;
}
if ('COLORTERM' in env) {
return 1;
}
return min;
}
function getSupportLevel(stream) {
const level = supportsColor(stream, stream && stream.isTTY);
return translateLevel(level);
}
module.exports = {
supportsColor: getSupportLevel,
stdout: translateLevel(supportsColor(true, tty.isatty(1))),
stderr: translateLevel(supportsColor(true, tty.isatty(2)))
};

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@ -0,0 +1,9 @@
MIT License
Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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{
"name": "supports-color",
"version": "7.2.0",
"description": "Detect whether a terminal supports color",
"license": "MIT",
"repository": "chalk/supports-color",
"author": {
"name": "Sindre Sorhus",
"email": "sindresorhus@gmail.com",
"url": "sindresorhus.com"
},
"engines": {
"node": ">=8"
},
"scripts": {
"test": "xo && ava"
},
"files": [
"index.js",
"browser.js"
],
"keywords": [
"color",
"colour",
"colors",
"terminal",
"console",
"cli",
"ansi",
"styles",
"tty",
"rgb",
"256",
"shell",
"xterm",
"command-line",
"support",
"supports",
"capability",
"detect",
"truecolor",
"16m"
],
"dependencies": {
"has-flag": "^4.0.0"
},
"devDependencies": {
"ava": "^1.4.1",
"import-fresh": "^3.0.0",
"xo": "^0.24.0"
},
"browser": "browser.js"
}

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# supports-color [![Build Status](https://travis-ci.org/chalk/supports-color.svg?branch=master)](https://travis-ci.org/chalk/supports-color)
> Detect whether a terminal supports color
## Install
```
$ npm install supports-color
```
## Usage
```js
const supportsColor = require('supports-color');
if (supportsColor.stdout) {
console.log('Terminal stdout supports color');
}
if (supportsColor.stdout.has256) {
console.log('Terminal stdout supports 256 colors');
}
if (supportsColor.stderr.has16m) {
console.log('Terminal stderr supports 16 million colors (truecolor)');
}
```
## API
Returns an `Object` with a `stdout` and `stderr` property for testing either streams. Each property is an `Object`, or `false` if color is not supported.
The `stdout`/`stderr` objects specifies a level of support for color through a `.level` property and a corresponding flag:
- `.level = 1` and `.hasBasic = true`: Basic color support (16 colors)
- `.level = 2` and `.has256 = true`: 256 color support
- `.level = 3` and `.has16m = true`: Truecolor support (16 million colors)
## Info
It obeys the `--color` and `--no-color` CLI flags.
For situations where using `--color` is not possible, use the environment variable `FORCE_COLOR=1` (level 1), `FORCE_COLOR=2` (level 2), or `FORCE_COLOR=3` (level 3) to forcefully enable color, or `FORCE_COLOR=0` to forcefully disable. The use of `FORCE_COLOR` overrides all other color support checks.
Explicit 256/Truecolor mode can be enabled using the `--color=256` and `--color=16m` flags, respectively.
## Related
- [supports-color-cli](https://github.com/chalk/supports-color-cli) - CLI for this module
- [chalk](https://github.com/chalk/chalk) - Terminal string styling done right
## Maintainers
- [Sindre Sorhus](https://github.com/sindresorhus)
- [Josh Junon](https://github.com/qix-)
---
<div align="center">
<b>
<a href="https://tidelift.com/subscription/pkg/npm-supports-color?utm_source=npm-supports-color&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a>
</b>
<br>
<sub>
Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
</sub>
</div>
---

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{
"name": "critters",
"version": "0.0.20",
"description": "Inline critical CSS and lazy-load the rest.",
"main": "dist/critters.js",
"module": "dist/critters.mjs",
"source": "src/index.js",
"exports": {
"import": "./dist/critters.mjs",
"require": "./dist/critters.js",
"default": "./dist/critters.mjs"
},
"typings": "src/index.d.ts",
"files": [
"src",
"dist"
],
"license": "Apache-2.0",
"author": "The Chromium Authors",
"contributors": [
{
"name": "Jason Miller",
"email": "developit@google.com"
},
{
"name": "Janicklas Ralph",
"email": "janicklas@google.com"
}
],
"keywords": [
"critical css",
"inline css",
"critical",
"critters",
"webpack plugin",
"performance"
],
"repository": {
"type": "git",
"url": "https://github.com/GoogleChromeLabs/critters",
"directory": "packages/critters"
},
"scripts": {
"build": "microbundle --target node --no-sourcemap -f cjs,esm",
"docs": "documentation readme -q --no-markdown-toc -a public -s Usage --sort-order alpha src",
"prepare": "npm run -s build"
},
"dependencies": {
"chalk": "^4.1.0",
"css-select": "^5.1.0",
"dom-serializer": "^2.0.0",
"domhandler": "^5.0.2",
"htmlparser2": "^8.0.2",
"postcss": "^8.4.23",
"pretty-bytes": "^5.3.0"
},
"devDependencies": {
"documentation": "^13.0.2",
"microbundle": "^0.12.3"
}
}

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/**
* Copyright 2018 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
import { parse, stringify } from 'postcss';
/**
* Parse a textual CSS Stylesheet into a Stylesheet instance.
* Stylesheet is a mutable postcss AST with format similar to CSSOM.
* @see https://github.com/postcss/postcss/
* @private
* @param {String} stylesheet
* @returns {css.Stylesheet} ast
*/
export function parseStylesheet(stylesheet) {
return parse(stylesheet);
}
/**
* Serialize a postcss Stylesheet to a String of CSS.
* @private
* @param {css.Stylesheet} ast A Stylesheet to serialize, such as one returned from `parseStylesheet()`
* @param {Object} options Options used by the stringify logic
* @param {Boolean} [options.compress] Compress CSS output (removes comments, whitespace, etc)
*/
export function serializeStylesheet(ast, options) {
let cssStr = '';
stringify(ast, (result, node, type) => {
if (!options.compress) {
cssStr += result;
return;
}
// Simple minification logic
if (node?.type === 'comment') return;
if (node?.type === 'decl') {
const prefix = node.prop + node.raws.between;
cssStr += result.replace(prefix, prefix.trim());
return;
}
if (type === 'start') {
if (node.type === 'rule' && node.selectors) {
cssStr += node.selectors.join(',') + '{';
} else {
cssStr += result.replace(/\s\{$/, '{');
}
return;
}
if (type === 'end' && result === '}' && node?.raws?.semicolon) {
cssStr = cssStr.slice(0, -1);
}
cssStr += result.trim();
});
return cssStr;
}
/**
* Converts a walkStyleRules() iterator to mark nodes with `.$$remove=true` instead of actually removing them.
* This means they can be removed in a second pass, allowing the first pass to be nondestructive (eg: to preserve mirrored sheets).
* @private
* @param {Function} iterator Invoked on each node in the tree. Return `false` to remove that node.
* @returns {(rule) => void} nonDestructiveIterator
*/
export function markOnly(predicate) {
return (rule) => {
const sel = rule.selectors;
if (predicate(rule) === false) {
rule.$$remove = true;
}
rule.$$markedSelectors = rule.selectors;
if (rule._other) {
rule._other.$$markedSelectors = rule._other.selectors;
}
rule.selectors = sel;
};
}
/**
* Apply filtered selectors to a rule from a previous markOnly run.
* @private
* @param {css.Rule} rule The Rule to apply marked selectors to (if they exist).
*/
export function applyMarkedSelectors(rule) {
if (rule.$$markedSelectors) {
rule.selectors = rule.$$markedSelectors;
}
if (rule._other) {
applyMarkedSelectors(rule._other);
}
}
/**
* Recursively walk all rules in a stylesheet.
* @private
* @param {css.Rule} node A Stylesheet or Rule to descend into.
* @param {Function} iterator Invoked on each node in the tree. Return `false` to remove that node.
*/
export function walkStyleRules(node, iterator) {
node.nodes = node.nodes.filter((rule) => {
if (hasNestedRules(rule)) {
walkStyleRules(rule, iterator);
}
rule._other = undefined;
rule.filterSelectors = filterSelectors;
return iterator(rule) !== false;
});
}
/**
* Recursively walk all rules in two identical stylesheets, filtering nodes into one or the other based on a predicate.
* @private
* @param {css.Rule} node A Stylesheet or Rule to descend into.
* @param {css.Rule} node2 A second tree identical to `node`
* @param {Function} iterator Invoked on each node in the tree. Return `false` to remove that node from the first tree, true to remove it from the second.
*/
export function walkStyleRulesWithReverseMirror(node, node2, iterator) {
if (node2 === null) return walkStyleRules(node, iterator);
[node.nodes, node2.nodes] = splitFilter(
node.nodes,
node2.nodes,
(rule, index, rules, rules2) => {
const rule2 = rules2[index];
if (hasNestedRules(rule)) {
walkStyleRulesWithReverseMirror(rule, rule2, iterator);
}
rule._other = rule2;
rule.filterSelectors = filterSelectors;
return iterator(rule) !== false;
}
);
}
// Checks if a node has nested rules, like @media
// @keyframes are an exception since they are evaluated as a whole
function hasNestedRules(rule) {
return (
rule.nodes &&
rule.nodes.length &&
rule.nodes.some((n) => n.type === 'rule' || n.type === 'atrule') &&
rule.name !== 'keyframes' &&
rule.name !== '-webkit-keyframes'
);
}
// Like [].filter(), but applies the opposite filtering result to a second copy of the Array without a second pass.
// This is just a quicker version of generating the compliment of the set returned from a filter operation.
function splitFilter(a, b, predicate) {
const aOut = [];
const bOut = [];
for (let index = 0; index < a.length; index++) {
if (predicate(a[index], index, a, b)) {
aOut.push(a[index]);
} else {
bOut.push(a[index]);
}
}
return [aOut, bOut];
}
// can be invoked on a style rule to subset its selectors (with reverse mirroring)
function filterSelectors(predicate) {
if (this._other) {
const [a, b] = splitFilter(
this.selectors,
this._other.selectors,
predicate
);
this.selectors = a;
this._other.selectors = b;
} else {
this.selectors = this.selectors.filter(predicate);
}
}

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/**
* Copyright 2018 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
import { selectAll, selectOne } from 'css-select';
import { parseDocument, DomUtils } from 'htmlparser2';
import { parse as selectorParser } from 'css-what';
import { Element, Text } from 'domhandler';
import render from 'dom-serializer';
let classCache = null;
let idCache = null;
function buildCache(container) {
classCache = new Set();
idCache = new Set();
const queue = [container];
while (queue.length) {
const node = queue.shift();
if (node.hasAttribute('class')) {
const classList = node.getAttribute('class').trim().split(' ');
classList.forEach((cls) => {
classCache.add(cls);
});
}
if (node.hasAttribute('id')) {
const id = node.getAttribute('id').trim();
idCache.add(id);
}
queue.push(...node.children.filter((child) => child.type === 'tag'));
}
}
/**
* Parse HTML into a mutable, serializable DOM Document.
* The DOM implementation is an htmlparser2 DOM enhanced with basic DOM mutation methods.
* @param {String} html HTML to parse into a Document instance
*/
export function createDocument(html) {
const document = /** @type {HTMLDocument} */ (parseDocument(html, {decodeEntities: false}));
defineProperties(document, DocumentExtensions);
// Extend Element.prototype with DOM manipulation methods.
defineProperties(Element.prototype, ElementExtensions);
// Critters container is the viewport to evaluate critical CSS
let crittersContainer = document.querySelector('[data-critters-container]');
if (!crittersContainer) {
document.documentElement.setAttribute('data-critters-container', '');
crittersContainer = document.documentElement;
}
document.crittersContainer = crittersContainer;
buildCache(crittersContainer);
return document;
}
/**
* Serialize a Document to an HTML String
* @param {HTMLDocument} document A Document, such as one created via `createDocument()`
*/
export function serializeDocument(document) {
return render(document, { decodeEntities: false });
}
/** @typedef {treeAdapter.Document & typeof ElementExtensions} HTMLDocument */
/**
* Methods and descriptors to mix into Element.prototype
* @private
*/
const ElementExtensions = {
/** @extends treeAdapter.Element.prototype */
nodeName: {
get() {
return this.tagName.toUpperCase();
}
},
id: reflectedProperty('id'),
className: reflectedProperty('class'),
insertBefore(child, referenceNode) {
if (!referenceNode) return this.appendChild(child);
DomUtils.prepend(referenceNode, child);
return child;
},
appendChild(child) {
DomUtils.appendChild(this, child);
return child;
},
removeChild(child) {
DomUtils.removeElement(child);
},
remove() {
DomUtils.removeElement(this);
},
textContent: {
get() {
return DomUtils.getText(this);
},
set(text) {
this.children = [];
DomUtils.appendChild(this, new Text(text));
}
},
setAttribute(name, value) {
if (this.attribs == null) this.attribs = {};
if (value == null) value = '';
this.attribs[name] = value;
},
removeAttribute(name) {
if (this.attribs != null) {
delete this.attribs[name];
}
},
getAttribute(name) {
return this.attribs != null && this.attribs[name];
},
hasAttribute(name) {
return this.attribs != null && this.attribs[name] != null;
},
getAttributeNode(name) {
const value = this.getAttribute(name);
if (value != null) return { specified: true, value };
},
exists(sel) {
return cachedQuerySelector(sel, this);
},
querySelector(sel) {
return selectOne(sel, this);
},
querySelectorAll(sel) {
return selectAll(sel, this);
}
};
/**
* Methods and descriptors to mix into the global document instance
* @private
*/
const DocumentExtensions = {
/** @extends treeAdapter.Document.prototype */
// document is just an Element in htmlparser2, giving it a nodeType of ELEMENT_NODE.
// TODO: verify if these are needed for css-select
nodeType: {
get() {
return 9;
}
},
contentType: {
get() {
return 'text/html';
}
},
nodeName: {
get() {
return '#document';
}
},
documentElement: {
get() {
// Find the first <html> element within the document
return this.children.find(
(child) => String(child.tagName).toLowerCase() === 'html'
);
}
},
head: {
get() {
return this.querySelector('head');
}
},
body: {
get() {
return this.querySelector('body');
}
},
createElement(name) {
return new Element(name);
},
createTextNode(text) {
// there is no dedicated createTextNode equivalent exposed in htmlparser2's DOM
return new Text(text);
},
exists(sel) {
return cachedQuerySelector(sel, this);
},
querySelector(sel) {
return selectOne(sel, this);
},
querySelectorAll(sel) {
if (sel === ':root') {
return this;
}
return selectAll(sel, this);
}
};
/**
* Essentially `Object.defineProperties()`, except function values are assigned as value descriptors for convenience.
* @private
*/
function defineProperties(obj, properties) {
for (const i in properties) {
const value = properties[i];
Object.defineProperty(
obj,
i,
typeof value === 'function' ? { value } : value
);
}
}
/**
* Create a property descriptor defining a getter/setter pair alias for a named attribute.
* @private
*/
function reflectedProperty(attributeName) {
return {
get() {
return this.getAttribute(attributeName);
},
set(value) {
this.setAttribute(attributeName, value);
}
};
}
function cachedQuerySelector(sel, node) {
const selectorTokens = selectorParser(sel);
for (const tokens of selectorTokens) {
// Check if the selector is a class selector
if (tokens.length === 1) {
const token = tokens[0];
if (token.type === 'attribute' && token.name === 'class') {
return classCache.has(token.value);
}
if (token.type === 'attribute' && token.name === 'id') {
return idCache.has(token.value);
}
}
}
return !!selectOne(sel, node);
}

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/**
* Copyright 2018 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
export default class Critters {
/**
* Create an instance of Critters with custom options.
* The `.process()` method can be called repeatedly to re-use this instance and its cache.
*/
constructor(options: Options);
/**
* Process an HTML document to inline critical CSS from its stylesheets.
* @param {string} html String containing a full HTML document to be parsed.
* @returns {string} A modified copy of the provided HTML with critical CSS inlined.
*/
process(html: string): Promise<string>;
/**
* Read the contents of a file from the specified filesystem or disk.
* Override this method to customize how stylesheets are loaded.
*/
readFile(filename: string): Promise<string> | string;
/**
* Given a stylesheet URL, returns the corresponding CSS asset.
* Overriding this method requires doing your own URL normalization, so it's generally better to override `readFile()`.
*/
getCssAsset(href: string): Promise<string | undefined> | string | undefined;
}
export interface Options {
path?: string;
publicPath?: string;
external?: boolean;
inlineThreshold?: number;
minimumExternalSize?: number;
pruneSource?: boolean;
mergeStylesheets?: boolean;
additionalStylesheets?: string[];
preload?: 'body' | 'media' | 'swap' | 'js' | 'js-lazy';
noscriptFallback?: boolean;
inlineFonts?: boolean;
preloadFonts?: boolean;
fonts?: boolean;
keyframes?: string;
compress?: boolean;
logLevel?: 'info' | 'warn' | 'error' | 'trace' | 'debug' | 'silent';
reduceInlineStyles?: boolean;
logger?: Logger;
}
export interface Logger {
trace?: (message: string) => void;
debug?: (message: string) => void;
info?: (message: string) => void;
warn?: (message: string) => void;
error?: (message: string) => void;
}

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/**
* Copyright 2018 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
import path from 'path';
import { readFile } from 'fs';
import prettyBytes from 'pretty-bytes';
import { createDocument, serializeDocument } from './dom';
import {
parseStylesheet,
serializeStylesheet,
walkStyleRules,
walkStyleRulesWithReverseMirror,
markOnly,
applyMarkedSelectors
} from './css';
import { createLogger } from './util';
/**
* The mechanism to use for lazy-loading stylesheets.
*
* Note: <kbd>JS</kbd> indicates a strategy requiring JavaScript (falls back to `<noscript>` unless disabled).
*
* - **default:** Move stylesheet links to the end of the document and insert preload meta tags in their place.
* - **"body":** Move all external stylesheet links to the end of the document.
* - **"media":** Load stylesheets asynchronously by adding `media="not x"` and removing once loaded. <kbd>JS</kbd>
* - **"swap":** Convert stylesheet links to preloads that swap to `rel="stylesheet"` once loaded ([details](https://www.filamentgroup.com/lab/load-css-simpler/#the-code)). <kbd>JS</kbd>
* - **"swap-high":** Use `<link rel="alternate stylesheet preload">` and swap to `rel="stylesheet"` once loaded ([details](http://filamentgroup.github.io/loadCSS/test/new-high.html)). <kbd>JS</kbd>
* - **"js":** Inject an asynchronous CSS loader similar to [LoadCSS](https://github.com/filamentgroup/loadCSS) and use it to load stylesheets. <kbd>JS</kbd>
* - **"js-lazy":** Like `"js"`, but the stylesheet is disabled until fully loaded.
* - **false:** Disables adding preload tags.
* @typedef {(default|'body'|'media'|'swap'|'swap-high'|'js'|'js-lazy')} PreloadStrategy
* @public
*/
/**
* Controls which keyframes rules are inlined.
*
* - **"critical":** _(default)_ inline keyframes rules that are used by the critical CSS.
* - **"all":** Inline all keyframes rules.
* - **"none":** Remove all keyframes rules.
* @typedef {('critical'|'all'|'none')} KeyframeStrategy
* @private
* @property {String} keyframes Which {@link KeyframeStrategy keyframe strategy} to use (default: `critical`)_
*/
/**
* Controls log level of the plugin. Specifies the level the logger should use. A logger will
* not produce output for any log level beneath the specified level. Available levels and order
* are:
*
* - **"info"** _(default)_
* - **"warn"**
* - **"error"**
* - **"trace"**
* - **"debug"**
* - **"silent"**
* @typedef {('info'|'warn'|'error'|'trace'|'debug'|'silent')} LogLevel
* @public
*/
/**
* Custom logger interface:
* @typedef {object} Logger
* @public
* @property {function(String)} trace - Prints a trace message
* @property {function(String)} debug - Prints a debug message
* @property {function(String)} info - Prints an information message
* @property {function(String)} warn - Prints a warning message
* @property {function(String)} error - Prints an error message
*/
/**
* All optional. Pass them to `new Critters({ ... })`.
* @public
* @typedef Options
* @property {String} path Base path location of the CSS files _(default: `''`)_
* @property {String} publicPath Public path of the CSS resources. This prefix is removed from the href _(default: `''`)_
* @property {Boolean} external Inline styles from external stylesheets _(default: `true`)_
* @property {Number} inlineThreshold Inline external stylesheets smaller than a given size _(default: `0`)_
* @property {Number} minimumExternalSize If the non-critical external stylesheet would be below this size, just inline it _(default: `0`)_
* @property {Boolean} pruneSource Remove inlined rules from the external stylesheet _(default: `false`)_
* @property {Boolean} mergeStylesheets Merged inlined stylesheets into a single `<style>` tag _(default: `true`)_
* @property {String[]} additionalStylesheets Glob for matching other stylesheets to be used while looking for critical CSS.
* @property {String} preload Which {@link PreloadStrategy preload strategy} to use
* @property {Boolean} noscriptFallback Add `<noscript>` fallback to JS-based strategies
* @property {Boolean} inlineFonts Inline critical font-face rules _(default: `false`)_
* @property {Boolean} preloadFonts Preloads critical fonts _(default: `true`)_
* @property {Boolean} fonts Shorthand for setting `inlineFonts` + `preloadFonts`
* - Values:
* - `true` to inline critical font-face rules and preload the fonts
* - `false` to don't inline any font-face rules and don't preload fonts
* @property {String} keyframes Controls which keyframes rules are inlined.
* - Values:
* - `"critical"`: _(default)_ inline keyframes rules used by the critical CSS
* - `"all"` inline all keyframes rules
* - `"none"` remove all keyframes rules
* @property {Boolean} compress Compress resulting critical CSS _(default: `true`)_
* @property {String} logLevel Controls {@link LogLevel log level} of the plugin _(default: `"info"`)_
* @property {object} logger Provide a custom logger interface {@link Logger logger}
*/
export default class Critters {
/** @private */
constructor(options) {
this.options = Object.assign(
{
logLevel: 'info',
path: '',
publicPath: '',
reduceInlineStyles: true,
pruneSource: false,
additionalStylesheets: [],
allowRules: []
},
options || {}
);
this.urlFilter = this.options.filter;
if (this.urlFilter instanceof RegExp) {
this.urlFilter = this.urlFilter.test.bind(this.urlFilter);
}
this.logger = this.options.logger || createLogger(this.options.logLevel);
}
/**
* Read the contents of a file from the specified filesystem or disk
*/
readFile(filename) {
const fs = this.fs;
return new Promise((resolve, reject) => {
const callback = (err, data) => {
if (err) reject(err);
else resolve(data);
};
if (fs && fs.readFile) {
fs.readFile(filename, callback);
} else {
readFile(filename, 'utf8', callback);
}
});
}
/**
* Apply critical CSS processing to the html
*/
async process(html) {
const start = process.hrtime.bigint();
// Parse the generated HTML in a DOM we can mutate
const document = createDocument(html);
if (this.options.additionalStylesheets.length > 0) {
this.embedAdditionalStylesheet(document);
}
// `external:false` skips processing of external sheets
if (this.options.external !== false) {
const externalSheets = [].slice.call(
document.querySelectorAll('link[rel="stylesheet"]')
);
await Promise.all(
externalSheets.map((link) => this.embedLinkedStylesheet(link, document))
);
}
// go through all the style tags in the document and reduce them to only critical CSS
const styles = this.getAffectedStyleTags(document);
await Promise.all(
styles.map((style) => this.processStyle(style, document))
);
if (this.options.mergeStylesheets !== false && styles.length !== 0) {
await this.mergeStylesheets(document);
}
// serialize the document back to HTML and we're done
const output = serializeDocument(document);
const end = process.hrtime.bigint();
this.logger.info('Time ' + parseFloat(end - start) / 1000000.0);
return output;
}
/**
* Get the style tags that need processing
*/
getAffectedStyleTags(document) {
const styles = [].slice.call(document.querySelectorAll('style'));
// `inline:false` skips processing of inline stylesheets
if (this.options.reduceInlineStyles === false) {
return styles.filter((style) => style.$$external);
}
return styles;
}
async mergeStylesheets(document) {
const styles = this.getAffectedStyleTags(document);
if (styles.length === 0) {
this.logger.warn(
'Merging inline stylesheets into a single <style> tag skipped, no inline stylesheets to merge'
);
return;
}
const first = styles[0];
let sheet = first.textContent;
for (let i = 1; i < styles.length; i++) {
const node = styles[i];
sheet += node.textContent;
node.remove();
}
first.textContent = sheet;
}
/**
* Given href, find the corresponding CSS asset
*/
async getCssAsset(href) {
const outputPath = this.options.path;
const publicPath = this.options.publicPath;
// CHECK - the output path
// path on disk (with output.publicPath removed)
let normalizedPath = href.replace(/^\//, '');
const pathPrefix = (publicPath || '').replace(/(^\/|\/$)/g, '') + '/';
if (normalizedPath.indexOf(pathPrefix) === 0) {
normalizedPath = normalizedPath
.substring(pathPrefix.length)
.replace(/^\//, '');
}
// Ignore remote stylesheets
if (/^https?:\/\//.test(normalizedPath) || href.startsWith('//')) {
return undefined;
}
const filename = path.resolve(outputPath, normalizedPath);
let sheet;
try {
sheet = await this.readFile(filename);
} catch (e) {
this.logger.warn(`Unable to locate stylesheet: ${filename}`);
}
return sheet;
}
checkInlineThreshold(link, style, sheet) {
if (
this.options.inlineThreshold &&
sheet.length < this.options.inlineThreshold
) {
const href = style.$$name;
style.$$reduce = false;
this.logger.info(
`\u001b[32mInlined all of ${href} (${sheet.length} was below the threshold of ${this.options.inlineThreshold})\u001b[39m`
);
link.remove();
return true;
}
return false;
}
/**
* Inline the stylesheets from options.additionalStylesheets (assuming it passes `options.filter`)
*/
async embedAdditionalStylesheet(document) {
const styleSheetsIncluded = [];
const sources = await Promise.all(
this.options.additionalStylesheets.map((cssFile) => {
if (styleSheetsIncluded.includes(cssFile)) {
return;
}
styleSheetsIncluded.push(cssFile);
const style = document.createElement('style');
style.$$external = true;
return this.getCssAsset(cssFile, style).then((sheet) => [sheet, style]);
})
);
sources.forEach(([sheet, style]) => {
if (!sheet) return;
style.textContent = sheet;
document.head.appendChild(style);
});
}
/**
* Inline the target stylesheet referred to by a <link rel="stylesheet"> (assuming it passes `options.filter`)
*/
async embedLinkedStylesheet(link, document) {
const href = link.getAttribute('href');
const media = link.getAttribute('media');
const preloadMode = this.options.preload;
// skip filtered resources, or network resources if no filter is provided
if (this.urlFilter ? this.urlFilter(href) : !(href || '').match(/\.css$/)) {
return Promise.resolve();
}
// the reduced critical CSS gets injected into a new <style> tag
const style = document.createElement('style');
style.$$external = true;
const sheet = await this.getCssAsset(href, style);
if (!sheet) {
return;
}
style.textContent = sheet;
style.$$name = href;
style.$$links = [link];
link.parentNode.insertBefore(style, link);
if (this.checkInlineThreshold(link, style, sheet)) {
return;
}
// CSS loader is only injected for the first sheet, then this becomes an empty string
let cssLoaderPreamble =
"function $loadcss(u,m,l){(l=document.createElement('link')).rel='stylesheet';l.href=u;document.head.appendChild(l)}";
const lazy = preloadMode === 'js-lazy';
if (lazy) {
cssLoaderPreamble = cssLoaderPreamble.replace(
'l.href',
"l.media='print';l.onload=function(){l.media=m};l.href"
);
}
// Allow disabling any mutation of the stylesheet link:
if (preloadMode === false) return;
let noscriptFallback = false;
if (preloadMode === 'body') {
document.body.appendChild(link);
} else {
link.setAttribute('rel', 'preload');
link.setAttribute('as', 'style');
if (preloadMode === 'js' || preloadMode === 'js-lazy') {
const script = document.createElement('script');
const js = `${cssLoaderPreamble}$loadcss(${JSON.stringify(href)}${
lazy ? ',' + JSON.stringify(media || 'all') : ''
})`;
// script.appendChild(document.createTextNode(js));
script.textContent = js;
link.parentNode.insertBefore(script, link.nextSibling);
style.$$links.push(script);
cssLoaderPreamble = '';
noscriptFallback = true;
} else if (preloadMode === 'media') {
// @see https://github.com/filamentgroup/loadCSS/blob/af1106cfe0bf70147e22185afa7ead96c01dec48/src/loadCSS.js#L26
link.setAttribute('rel', 'stylesheet');
link.removeAttribute('as');
link.setAttribute('media', 'print');
link.setAttribute('onload', `this.media='${media || 'all'}'`);
noscriptFallback = true;
} else if (preloadMode === 'swap-high') {
// @see http://filamentgroup.github.io/loadCSS/test/new-high.html
link.setAttribute('rel', 'alternate stylesheet preload');
link.setAttribute('title', 'styles');
link.setAttribute('onload', `this.title='';this.rel='stylesheet'`);
noscriptFallback = true;
} else if (preloadMode === 'swap') {
link.setAttribute('onload', "this.rel='stylesheet'");
noscriptFallback = true;
} else {
const bodyLink = document.createElement('link');
bodyLink.setAttribute('rel', 'stylesheet');
if (media) bodyLink.setAttribute('media', media);
bodyLink.setAttribute('href', href);
document.body.appendChild(bodyLink);
style.$$links.push(bodyLink);
}
}
if (this.options.noscriptFallback !== false && noscriptFallback) {
const noscript = document.createElement('noscript');
const noscriptLink = document.createElement('link');
noscriptLink.setAttribute('rel', 'stylesheet');
noscriptLink.setAttribute('href', href);
if (media) noscriptLink.setAttribute('media', media);
noscript.appendChild(noscriptLink);
link.parentNode.insertBefore(noscript, link.nextSibling);
style.$$links.push(noscript);
}
}
/**
* Prune the source CSS files
*/
pruneSource(style, before, sheetInverse) {
// if external stylesheet would be below minimum size, just inline everything
const minSize = this.options.minimumExternalSize;
const name = style.$$name;
if (minSize && sheetInverse.length < minSize) {
this.logger.info(
`\u001b[32mInlined all of ${name} (non-critical external stylesheet would have been ${sheetInverse.length}b, which was below the threshold of ${minSize})\u001b[39m`
);
style.textContent = before;
// remove any associated external resources/loaders:
if (style.$$links) {
for (const link of style.$$links) {
const parent = link.parentNode;
if (parent) parent.removeChild(link);
}
}
return true;
}
return false;
}
/**
* Parse the stylesheet within a <style> element, then reduce it to contain only rules used by the document.
*/
async processStyle(style, document) {
if (style.$$reduce === false) return;
const name = style.$$name ? style.$$name.replace(/^\//, '') : 'inline CSS';
const options = this.options;
const crittersContainer = document.crittersContainer;
let keyframesMode = options.keyframes || 'critical';
// we also accept a boolean value for options.keyframes
if (keyframesMode === true) keyframesMode = 'all';
if (keyframesMode === false) keyframesMode = 'none';
let sheet = style.textContent;
// store a reference to the previous serialized stylesheet for reporting stats
const before = sheet;
// Skip empty stylesheets
if (!sheet) return;
const ast = parseStylesheet(sheet);
const astInverse = options.pruneSource ? parseStylesheet(sheet) : null;
// a string to search for font names (very loose)
let criticalFonts = '';
const failedSelectors = [];
const criticalKeyframeNames = [];
let includeNext = false;
let includeAll = false;
let excludeNext = false;
let excludeAll = false;
// Walk all CSS rules, marking unused rules with `.$$remove=true` for removal in the second pass.
// This first pass is also used to collect font and keyframe usage used in the second pass.
walkStyleRules(
ast,
markOnly((rule) => {
if (rule.type === 'comment') {
const comment = rule.text.trim();
if (comment.startsWith('critters')) {
const command = comment.replace(/^critters:/, '');
switch (command) {
case 'include':
includeNext = true;
break;
case 'exclude':
excludeNext = true;
break;
case 'include start':
includeAll = true;
break;
case 'include end':
includeAll = false;
break;
case 'exclude start':
excludeAll = true;
break;
case 'exclude end':
excludeAll = false;
break;
}
}
}
if (rule.type === 'rule') {
// Handle comment based markers
if (includeNext) {
includeNext = false;
return true;
}
if (excludeNext) {
excludeNext = false;
return false;
}
if (includeAll) {
return true;
}
if (excludeAll) {
return false;
}
// Filter the selector list down to only those match
rule.filterSelectors((sel) => {
// Validate rule with 'allowRules' option
const isAllowedRule = options.allowRules.some((exp) => {
if (exp instanceof RegExp) {
return exp.test(sel);
}
return exp === sel;
});
if (isAllowedRule) return true;
// Strip pseudo-elements and pseudo-classes, since we only care that their associated elements exist.
// This means any selector for a pseudo-element or having a pseudo-class will be inlined if the rest of the selector matches.
if (
sel === ':root' ||
sel.match(/^::?(before|after)$/) ||
sel === 'html' ||
sel === 'body'
) {
return true;
}
sel = sel
.replace(/(?<!\\)::?[a-z-]+(?![a-z-(])/gi, '')
.replace(/::?not\(\s*\)/g, '')
// Remove tailing or leading commas from cleaned sub selector `is(.active, :hover)` -> `is(.active)`.
.replace(/\(\s*,/g, '(')
.replace(/,\s*\)/g, ')')
.trim();
if (!sel) return false;
try {
return crittersContainer.exists(sel);
} catch (e) {
failedSelectors.push(sel + ' -> ' + e.message);
return false;
}
});
// If there are no matched selectors, remove the rule:
if (!rule.selector) {
return false;
}
if (rule.nodes) {
for (let i = 0; i < rule.nodes.length; i++) {
const decl = rule.nodes[i];
// detect used fonts
if (decl.prop && decl.prop.match(/\bfont(-family)?\b/i)) {
criticalFonts += ' ' + decl.value;
}
// detect used keyframes
if (decl.prop === 'animation' || decl.prop === 'animation-name') {
// @todo: parse animation declarations and extract only the name. for now we'll do a lazy match.
const names = decl.value.split(/\s+/);
for (let j = 0; j < names.length; j++) {
const name = names[j].trim();
if (name) criticalKeyframeNames.push(name);
}
}
}
}
}
// keep font rules, they're handled in the second pass:
if (rule.type === 'atrule' && rule.name === 'font-face') return;
// If there are no remaining rules, remove the whole rule:
const rules = rule.nodes && rule.nodes.filter((rule) => !rule.$$remove);
return !rules || rules.length !== 0;
})
);
if (failedSelectors.length !== 0) {
this.logger.warn(
`${
failedSelectors.length
} rules skipped due to selector errors:\n ${failedSelectors.join(
'\n '
)}`
);
}
const shouldPreloadFonts =
options.fonts === true || options.preloadFonts === true;
const shouldInlineFonts =
options.fonts !== false && options.inlineFonts === true;
const preloadedFonts = [];
// Second pass, using data picked up from the first
walkStyleRulesWithReverseMirror(ast, astInverse, (rule) => {
// remove any rules marked in the first pass
if (rule.$$remove === true) return false;
applyMarkedSelectors(rule);
// prune @keyframes rules
if (rule.type === 'atrule' && rule.name === 'keyframes') {
if (keyframesMode === 'none') return false;
if (keyframesMode === 'all') return true;
return criticalKeyframeNames.indexOf(rule.params) !== -1;
}
// prune @font-face rules
if (rule.type === 'atrule' && rule.name === 'font-face') {
let family, src;
for (let i = 0; i < rule.nodes.length; i++) {
const decl = rule.nodes[i];
if (decl.prop === 'src') {
// @todo parse this properly and generate multiple preloads with type="font/woff2" etc
src = (decl.value.match(/url\s*\(\s*(['"]?)(.+?)\1\s*\)/) || [])[2];
} else if (decl.prop === 'font-family') {
family = decl.value;
}
}
if (src && shouldPreloadFonts && preloadedFonts.indexOf(src) === -1) {
preloadedFonts.push(src);
const preload = document.createElement('link');
preload.setAttribute('rel', 'preload');
preload.setAttribute('as', 'font');
preload.setAttribute('crossorigin', 'anonymous');
preload.setAttribute('href', src.trim());
document.head.appendChild(preload);
}
// if we're missing info, if the font is unused, or if critical font inlining is disabled, remove the rule:
if (
!family ||
!src ||
criticalFonts.indexOf(family) === -1 ||
!shouldInlineFonts
) {
return false;
}
}
});
sheet = serializeStylesheet(ast, {
compress: this.options.compress !== false
});
// If all rules were removed, get rid of the style element entirely
if (sheet.trim().length === 0) {
if (style.parentNode) {
style.remove();
}
return;
}
let afterText = '';
let styleInlinedCompletely = false;
if (options.pruneSource) {
const sheetInverse = serializeStylesheet(astInverse, {
compress: this.options.compress !== false
});
styleInlinedCompletely = this.pruneSource(style, before, sheetInverse);
if (styleInlinedCompletely) {
const percent = (sheetInverse.length / before.length) * 100;
afterText = `, reducing non-inlined size ${
percent | 0
}% to ${prettyBytes(sheetInverse.length)}`;
}
}
// replace the inline stylesheet with its critical'd counterpart
if (!styleInlinedCompletely) {
style.textContent = sheet;
}
// output stats
const percent = ((sheet.length / before.length) * 100) | 0;
this.logger.info(
'\u001b[32mInlined ' +
prettyBytes(sheet.length) +
' (' +
percent +
'% of original ' +
prettyBytes(before.length) +
') of ' +
name +
afterText +
'.\u001b[39m'
);
}
}

40
my-app/node_modules/critters/src/util.js generated vendored Executable file
View file

@ -0,0 +1,40 @@
import chalk from 'chalk';
const LOG_LEVELS = ['trace', 'debug', 'info', 'warn', 'error', 'silent'];
export const defaultLogger = {
trace(msg) {
console.trace(msg);
},
debug(msg) {
console.debug(msg);
},
warn(msg) {
console.warn(chalk.yellow(msg));
},
error(msg) {
console.error(chalk.bold.red(msg));
},
info(msg) {
console.info(chalk.bold.blue(msg));
},
silent() {}
};
export function createLogger(logLevel) {
const logLevelIdx = LOG_LEVELS.indexOf(logLevel);
return LOG_LEVELS.reduce((logger, type, index) => {
if (index >= logLevelIdx) {
logger[type] = defaultLogger[type];
} else {
logger[type] = defaultLogger.silent;
}
return logger;
}, {});
}