120 lines
3.2 KiB
JavaScript
120 lines
3.2 KiB
JavaScript
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/* eslint-disable import/no-extraneous-dependencies */
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import fs from "fs";
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import { join } from "path";
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import { URL, fileURLToPath } from "url";
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import { minify } from "terser";
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import { transformSync } from "@babel/core";
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import presetTypescript from "@babel/preset-typescript";
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import { gzipSync } from "zlib";
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const HELPERS_FOLDER = new URL("../src/helpers", import.meta.url);
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const IGNORED_FILES = new Set(["package.json"]);
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export default async function generateHelpers() {
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let output = `/*
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* This file is auto-generated! Do not modify it directly.
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* To re-generate run 'yarn gulp generate-runtime-helpers'
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*/
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import template from "@babel/template";
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function helper(minVersion: string, source: string) {
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return Object.freeze({
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minVersion,
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ast: () => template.program.ast(source, { preserveComments: true }),
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})
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}
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export default Object.freeze({
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`;
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for (const file of (await fs.promises.readdir(HELPERS_FOLDER)).sort()) {
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if (IGNORED_FILES.has(file)) continue;
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if (file.startsWith(".")) continue; // ignore e.g. vim swap files
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const [helperName] = file.split(".");
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const isTs = file.endsWith(".ts");
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const filePath = join(fileURLToPath(HELPERS_FOLDER), file);
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if (!file.endsWith(".js") && !isTs) {
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console.error("ignoring", filePath);
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continue;
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}
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let code = await fs.promises.readFile(filePath, "utf8");
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const minVersionMatch = code.match(
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/^\s*\/\*\s*@minVersion\s+(?<minVersion>\S+)\s*\*\/\s*$/m
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);
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if (!minVersionMatch) {
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throw new Error(`@minVersion number missing in ${filePath}`);
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}
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const { minVersion } = minVersionMatch.groups;
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const mangleFns = code.includes("@mangleFns");
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const noMangleFns = [];
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code = transformSync(code, {
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configFile: false,
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babelrc: false,
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filename: filePath,
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presets: [
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[
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presetTypescript,
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{
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onlyRemoveTypeImports: true,
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optimizeConstEnums: true,
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},
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],
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],
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plugins: [
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/**
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* @type {import("@babel/core").PluginObj}
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*/
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{
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visitor: {
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ImportDeclaration(path) {
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const source = path.node.source;
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source.value = source.value
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.replace(/\.ts$/, "")
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.replace(/^\.\//, "");
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},
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FunctionDeclaration(path) {
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if (
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mangleFns &&
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path.node.leadingComments?.find(c =>
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c.value.includes("@no-mangle")
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)
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) {
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const name = path.node.id.name;
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if (name) noMangleFns.push(name);
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}
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},
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},
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},
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],
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}).code;
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code = (
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await minify(code, {
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ecma: 5,
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mangle: {
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keep_fnames: mangleFns ? new RegExp(noMangleFns.join("|")) : true,
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},
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// The _typeof helper has a custom directive that we must keep
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compress: { directives: false, passes: 10 },
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})
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).code;
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output += `\
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// size: ${code.length}, gzip size: ${gzipSync(code).length}
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${JSON.stringify(helperName)}: helper(
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${JSON.stringify(minVersion)},
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${JSON.stringify(code)},
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),
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`;
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}
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output += "});";
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return output;
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}
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