Deployed the page to Github Pages.

node_modules/err-code/.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[package.json]
+indent_size = 2

node_modules/err-code/.eslintrc.json

@@ -0,0 +1,7 @@
+{
+    "root": true,
+    "extends": [
+        "@satazor/eslint-config/es6",
+        "@satazor/eslint-config/addons/node"
+    ]
+}

node_modules/err-code/.travis.yml

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+language: node_js
+node_js:
+  - "4"
+  - "6"

node_modules/err-code/README.md

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+# err-code
+
+[![NPM version][npm-image]][npm-url] [![Downloads][downloads-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Dependency status][david-dm-image]][david-dm-url] [![Dev Dependency status][david-dm-dev-image]][david-dm-dev-url] [![Greenkeeper badge][greenkeeper-image]][greenkeeper-url]
+
+[npm-url]:https://npmjs.org/package/err-code
+[downloads-image]:http://img.shields.io/npm/dm/err-code.svg
+[npm-image]:http://img.shields.io/npm/v/err-code.svg
+[travis-url]:https://travis-ci.org/IndigoUnited/js-err-code
+[travis-image]:http://img.shields.io/travis/IndigoUnited/js-err-code/master.svg
+[david-dm-url]:https://david-dm.org/IndigoUnited/js-err-code
+[david-dm-image]:https://img.shields.io/david/IndigoUnited/js-err-code.svg
+[david-dm-dev-url]:https://david-dm.org/IndigoUnited/js-err-code?type=dev
+[david-dm-dev-image]:https://img.shields.io/david/dev/IndigoUnited/js-err-code.svg
+[greenkeeper-image]:https://badges.greenkeeper.io/IndigoUnited/js-err-code.svg
+[greenkeeper-url]:https://greenkeeper.io/
+
+Create new error instances with a code and additional properties.
+
+
+## Installation
+
+```console
+$ npm install err-code
+// or
+$ bower install err-code
+```
+
+The browser file is named index.umd.js which supports CommonJS, AMD and globals (errCode).
+
+
+## Why
+
+I find myself doing this repeatedly:
+
+```js
+var err = new Error('My message');
+err.code = 'SOMECODE';
+err.detail = 'Additional information about the error';
+throw err;
+```
+
+
+## Usage
+
+Simple usage.
+
+```js
+var errcode = require('err-code');
+
+// fill error with message + code
+throw errcode(new Error('My message'), 'ESOMECODE');
+// fill error with message + code + props
+throw errcode(new Error('My message'), 'ESOMECODE', { detail: 'Additional information about the error' });
+// fill error with message + props
+throw errcode(new Error('My message'), { detail: 'Additional information about the error' });
+```
+
+## Pre-existing fields
+
+If the passed `Error` already has a `.code` field, or fields specified in the third argument to `errcode` they will be overwritten, unless the fields are read only or otherwise throw during assignment in which case a new object will be created that shares a prototype chain with the original `Error`. The `.stack` and `.message` properties will be carried over from the original error and `.code` or any passed properties will be set on it.
+
+
+## Tests
+
+`$ npm test`
+
+
+## License
+
+Released under the [MIT License](http://www.opensource.org/licenses/mit-license.php).

node_modules/err-code/bower.json

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+{
+  "name": "err-code",
+  "version": "1.1.1",
+  "description": "Create new error instances with a code and additional properties",
+  "main": "index.umd.js",
+  "homepage": "https://github.com/IndigoUnited/js-err-code",
+  "authors": [
+    "IndigoUnited <hello@indigounited.com> (http://indigounited.com)"
+  ],
+  "moduleType": [
+    "amd",
+    "globals",
+    "node"
+  ],
+  "keywords": [
+      "error",
+      "err",
+      "code",
+      "properties",
+      "property"
+  ],
+  "license": "MIT",
+  "ignore": [
+    "**/.*",
+    "node_modules",
+    "bower_components",
+    "test",
+    "tests"
+  ]
+}

node_modules/err-code/index.js

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+'use strict';
+
+function assign(obj, props) {
+    for (const key in props) {
+        Object.defineProperty(obj, key, {
+            value: props[key],
+            enumerable: true,
+            configurable: true,
+        });
+    }
+
+    return obj;
+}
+
+function createError(err, code, props) {
+    if (!err || typeof err === 'string') {
+        throw new TypeError('Please pass an Error to err-code');
+    }
+
+    if (!props) {
+        props = {};
+    }
+
+    if (typeof code === 'object') {
+        props = code;
+        code = undefined;
+    }
+
+    if (code != null) {
+        props.code = code;
+    }
+
+    try {
+        return assign(err, props);
+    } catch (_) {
+        props.message = err.message;
+        props.stack = err.stack;
+
+        const ErrClass = function () {};
+
+        ErrClass.prototype = Object.create(Object.getPrototypeOf(err));
+
+        return assign(new ErrClass(), props);
+    }
+}
+
+module.exports = createError;

node_modules/err-code/index.umd.js

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+(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.errCode = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
+'use strict';
+
+function assign(obj, props) {
+    for (const key in props) {
+        Object.defineProperty(obj, key, {
+            value: props[key],
+            enumerable: true,
+            configurable: true,
+        });
+    }
+
+    return obj;
+}
+
+function createError(err, code, props) {
+    if (!err || typeof err === 'string') {
+        throw new TypeError('Please pass an Error to err-code');
+    }
+
+    if (!props) {
+        props = {};
+    }
+
+    if (typeof code === 'object') {
+        props = code;
+        code = undefined;
+    }
+
+    if (code != null) {
+        props.code = code;
+    }
+
+    try {
+        return assign(err, props);
+    } catch (_) {
+        props.message = err.message;
+        props.stack = err.stack;
+
+        const ErrClass = function () {};
+
+        ErrClass.prototype = Object.create(Object.getPrototypeOf(err));
+
+        return assign(new ErrClass(), props);
+    }
+}
+
+module.exports = createError;
+
+},{}]},{},[1])(1)
+});

node_modules/err-code/package.json

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+{
+  "name": "err-code",
+  "version": "2.0.3",
+  "description": "Create an error with a code",
+  "main": "index.js",
+  "scripts": {
+    "lint": "eslint '{*.js,test/**/*.js}' --ignore-pattern *.umd.js",
+    "test": "mocha --bail",
+    "browserify": "browserify -s err-code index.js > index.umd.js"
+  },
+  "bugs": {
+    "url": "https://github.com/IndigoUnited/js-err-code/issues/"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/IndigoUnited/js-err-code.git"
+  },
+  "keywords": [
+    "error",
+    "err",
+    "code",
+    "properties",
+    "property"
+  ],
+  "author": "IndigoUnited <hello@indigounited.com> (http://indigounited.com)",
+  "license": "MIT",
+  "devDependencies": {
+    "@satazor/eslint-config": "^3.0.0",
+    "browserify": "^16.5.1",
+    "eslint": "^7.2.0",
+    "expect.js": "^0.3.1",
+    "mocha": "^8.0.1"
+  }
+}

node_modules/err-code/test/.eslintrc.json

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+{
+    "env": {
+        "mocha": true
+    }
+}

node_modules/err-code/test/test.js

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+'use strict';
+
+const errcode = require('../index');
+const expect = require('expect.js');
+
+describe('errcode', () => {
+    describe('string as first argument', () => {
+        it('should throw an error', () => {
+            expect(() => { errcode('my message'); }).to.throwError((err) => {
+                expect(err).to.be.a(TypeError);
+            });
+        });
+    });
+
+    describe('error as first argument', () => {
+        it('should accept an error and do nothing', () => {
+            const myErr = new Error('my message');
+            const err = errcode(myErr);
+
+            expect(err).to.be(myErr);
+            expect(err.hasOwnProperty(err.code)).to.be(false);
+        });
+
+        it('should accept an error and add a code', () => {
+            const myErr = new Error('my message');
+            const err = errcode(myErr, 'ESOME');
+
+            expect(err).to.be(myErr);
+            expect(err.code).to.be('ESOME');
+        });
+
+        it('should accept an error object and add code & properties', () => {
+            const myErr = new Error('my message');
+            const err = errcode(myErr, 'ESOME', { foo: 'bar', bar: 'foo' });
+
+            expect(err).to.be.an(Error);
+            expect(err.code).to.be('ESOME');
+            expect(err.foo).to.be('bar');
+            expect(err.bar).to.be('foo');
+        });
+
+        it('should create an error object without code but with properties', () => {
+            const myErr = new Error('my message');
+            const err = errcode(myErr, { foo: 'bar', bar: 'foo' });
+
+            expect(err).to.be.an(Error);
+            expect(err.code).to.be(undefined);
+            expect(err.foo).to.be('bar');
+            expect(err.bar).to.be('foo');
+        });
+
+        it('should set a non-writable field', () => {
+            const myErr = new Error('my message');
+
+            Object.defineProperty(myErr, 'code', {
+                value: 'derp',
+                writable: false,
+            });
+            const err = errcode(myErr, 'ERR_WAT');
+
+            expect(err).to.be.an(Error);
+            expect(err.stack).to.equal(myErr.stack);
+            expect(err.code).to.be('ERR_WAT');
+        });
+
+        it('should add a code to frozen object', () => {
+            const myErr = new Error('my message');
+            const err = errcode(Object.freeze(myErr), 'ERR_WAT');
+
+            expect(err).to.be.an(Error);
+            expect(err.stack).to.equal(myErr.stack);
+            expect(err.code).to.be('ERR_WAT');
+        });
+
+        it('should to set a field that throws at assignment time', () => {
+            const myErr = new Error('my message');
+
+            Object.defineProperty(myErr, 'code', {
+                enumerable: true,
+                set() {
+                    throw new Error('Nope!');
+                },
+                get() {
+                    return 'derp';
+                },
+            });
+            const err = errcode(myErr, 'ERR_WAT');
+
+            expect(err).to.be.an(Error);
+            expect(err.stack).to.equal(myErr.stack);
+            expect(err.code).to.be('ERR_WAT');
+        });
+
+        it('should retain error type', () => {
+            const myErr = new TypeError('my message');
+
+            Object.defineProperty(myErr, 'code', {
+                value: 'derp',
+                writable: false,
+            });
+            const err = errcode(myErr, 'ERR_WAT');
+
+            expect(err).to.be.a(TypeError);
+            expect(err.stack).to.equal(myErr.stack);
+            expect(err.code).to.be('ERR_WAT');
+        });
+
+        it('should add a code to a class that extends Error', () => {
+            class CustomError extends Error {
+                set code(val) {
+                    throw new Error('Nope!');
+                }
+            }
+
+            const myErr = new CustomError('my message');
+
+            Object.defineProperty(myErr, 'code', {
+                value: 'derp',
+                writable: false,
+                configurable: false,
+            });
+            const err = errcode(myErr, 'ERR_WAT');
+
+            expect(err).to.be.a(CustomError);
+            expect(err.stack).to.equal(myErr.stack);
+            expect(err.code).to.be('ERR_WAT');
+
+            // original prototype chain should be intact
+            expect(() => {
+                const otherErr = new CustomError('my message');
+
+                otherErr.code = 'derp';
+            }).to.throwError();
+        });
+
+        it('should support errors that are not Errors', () => {
+            const err = errcode({
+                message: 'Oh noes!',
+            }, 'ERR_WAT');
+
+            expect(err.message).to.be('Oh noes!');
+            expect(err.code).to.be('ERR_WAT');
+        });
+    });
+
+    describe('falsy first arguments', () => {
+        it('should not allow passing null as the first argument', () => {
+            expect(() => { errcode(null); }).to.throwError((err) => {
+                expect(err).to.be.a(TypeError);
+            });
+        });
+
+        it('should not allow passing undefined as the first argument', () => {
+            expect(() => { errcode(undefined); }).to.throwError((err) => {
+                expect(err).to.be.a(TypeError);
+            });
+        });
+    });
+});