replace gulp with webpack, add prettier, eslint, improve build process

Author: softvar

.eslintignore

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+dist/
+*.zip

.eslintrc.json

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+{
+  "extends": ["standard", "plugin:prettier/recommended"],
+  "rules": {
+    "promise/param-names": "off",
+    "handle-callback-err": 0
+  },
+  "env": {
+    "browser": true,
+    "node": true,
+    "jest": true
+  }
+}

.gitignore

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 *zip*
+dist/
 node_modules/
 *.log
 .idea

.prettierrc

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+{
+  "semi": true,
+  "printWidth": 120,
+  "tabWidth": 2,
+  "useTabs": false,
+  "singleQuote": true,
+  "bracketSpacing": true
+}

webpack.config.js

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+const webpack = require('webpack');
+const CopyPlugin = require('copy-webpack-plugin');
+const { CleanWebpackPlugin } = require('clean-webpack-plugin');
+const ZipFilesPlugin = require('webpack-zip-files-plugin');
+
+const path = require('path');
+const packageFile = require('./package.json');
+
+const libraryName = 'enhanced-github';
+const libVersion = packageFile.version;
+const license = packageFile.license;
+const destination = path.resolve(__dirname, 'dist');
+const zipDestination = path.resolve(__dirname, 'enhanced-github');
+
+let deps = '';
+Object.keys(packageFile.dependencies).map((key, index) => {
+  deps += `\n ${index + 1}. ${key} - ${packageFile.dependencies[key]}`;
+});
+
+const libraryHeaderComment = `${libraryName} - v${libVersion}\n
+URL - https://github.com/softvar/ehanced-github\n
+${license} License, Copyright Varun Malhotra
+
+Dependencies used - ${deps}`;
+
+const plugins = [
+  new webpack.BannerPlugin({
+    banner: libraryHeaderComment,
+    entryOnly: true
+  }),
+  new CleanWebpackPlugin({
+    default: [destination]
+  }),
+  new CopyPlugin([
+    { from: 'options.js', to: destination },
+    { from: 'popup.js', to: destination },
+    { from: '*html', to: destination },
+    { from: 'manifest.json', to: destination },
+    { from: 'icons/*.png', to: destination }
+  ]),
+  new ZipFilesPlugin({
+    entries: [
+      { src: destination, dist: zipDestination }
+    ],
+    output: zipDestination,
+    format: 'zip',
+  }),
+];
+
+module.exports = function(_env, argv) {
+  return {
+    entry: {
+      [libraryName]: './src/inject.js'
+    },
+    mode: argv.mode,
+    output: {
+      path: destination,
+      filename: 'src/inject.js',
+      library: libraryName,
+      libraryTarget: 'global'
+    },
+    module: {
+      rules: [
+        {
+          test: /\.js$/,
+          exclude: /node_modules|dist/,
+          use: {
+            loader: 'babel-loader'
+          }
+        }
+      ]
+    },
+    plugins
+  };
+};