WIP - add extractor, generate snippet_data

node_modules/terser-webpack-plugin/dist/minify.js

@@ -0,0 +1,186 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+
+var _terser = require("terser");
+
+function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; var ownKeys = Object.keys(source); if (typeof Object.getOwnPropertySymbols === 'function') { ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) { return Object.getOwnPropertyDescriptor(source, sym).enumerable; })); } ownKeys.forEach(function (key) { _defineProperty(target, key, source[key]); }); } return target; }
+
+function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+
+const buildTerserOptions = ({
+  ecma,
+  warnings,
+  parse = {},
+  compress = {},
+  mangle,
+  module,
+  output,
+  toplevel,
+  nameCache,
+  ie8,
+
+  /* eslint-disable camelcase */
+  keep_classnames,
+  keep_fnames,
+
+  /* eslint-enable camelcase */
+  safari10
+} = {}) => ({
+  ecma,
+  warnings,
+  parse: _objectSpread({}, parse),
+  compress: typeof compress === 'boolean' ? compress : _objectSpread({}, compress),
+  // eslint-disable-next-line no-nested-ternary
+  mangle: mangle == null ? true : typeof mangle === 'boolean' ? mangle : _objectSpread({}, mangle),
+  output: _objectSpread({
+    shebang: true,
+    comments: false,
+    beautify: false,
+    semicolons: true
+  }, output),
+  module,
+  // Ignoring sourceMap from options
+  sourceMap: null,
+  toplevel,
+  nameCache,
+  ie8,
+  keep_classnames,
+  keep_fnames,
+  safari10
+});
+
+const buildComments = (options, terserOptions, extractedComments) => {
+  const condition = {};
+  const commentsOpts = terserOptions.output.comments; // Use /^\**!|@preserve|@license|@cc_on/i RegExp
+
+  if (typeof options.extractComments === 'boolean') {
+    condition.preserve = commentsOpts;
+    condition.extract = /^\**!|@preserve|@license|@cc_on/i;
+  } else if (typeof options.extractComments === 'string' || options.extractComments instanceof RegExp) {
+    // extractComments specifies the extract condition and commentsOpts specifies the preserve condition
+    condition.preserve = commentsOpts;
+    condition.extract = options.extractComments;
+  } else if (typeof options.extractComments === 'function') {
+    condition.preserve = commentsOpts;
+    condition.extract = options.extractComments;
+  } else if (Object.prototype.hasOwnProperty.call(options.extractComments, 'condition')) {
+    // Extract condition is given in extractComments.condition
+    condition.preserve = commentsOpts;
+    condition.extract = options.extractComments.condition;
+  } else {
+    // No extract condition is given. Extract comments that match commentsOpts instead of preserving them
+    condition.preserve = false;
+    condition.extract = commentsOpts;
+  } // Ensure that both conditions are functions
+
+
+  ['preserve', 'extract'].forEach(key => {
+    let regexStr;
+    let regex;
+
+    switch (typeof condition[key]) {
+      case 'boolean':
+        condition[key] = condition[key] ? () => true : () => false;
+        break;
+
+      case 'function':
+        break;
+
+      case 'string':
+        if (condition[key] === 'all') {
+          condition[key] = () => true;
+
+          break;
+        }
+
+        if (condition[key] === 'some') {
+          condition[key] = (astNode, comment) => {
+            return comment.type === 'comment2' && /^\**!|@preserve|@license|@cc_on/i.test(comment.value);
+          };
+
+          break;
+        }
+
+        regexStr = condition[key];
+
+        condition[key] = (astNode, comment) => {
+          return new RegExp(regexStr).test(comment.value);
+        };
+
+        break;
+
+      default:
+        regex = condition[key];
+
+        condition[key] = (astNode, comment) => regex.test(comment.value);
+
+    }
+  }); // Redefine the comments function to extract and preserve
+  // comments according to the two conditions
+
+  return (astNode, comment) => {
+    if (condition.extract(astNode, comment)) {
+      const commentText = comment.type === 'comment2' ? `/*${comment.value}*/` : `//${comment.value}`; // Don't include duplicate comments
+
+      if (!extractedComments.includes(commentText)) {
+        extractedComments.push(commentText);
+      }
+    }
+
+    return condition.preserve(astNode, comment);
+  };
+};
+
+const minify = options => {
+  const {
+    file,
+    input,
+    inputSourceMap,
+    extractComments,
+    minify: minifyFn
+  } = options;
+
+  if (minifyFn) {
+    return minifyFn({
+      [file]: input
+    }, inputSourceMap);
+  } // Copy terser options
+
+
+  const terserOptions = buildTerserOptions(options.terserOptions); // Add source map data
+
+  if (inputSourceMap) {
+    terserOptions.sourceMap = {
+      content: inputSourceMap
+    };
+  }
+
+  const extractedComments = [];
+
+  if (extractComments) {
+    terserOptions.output.comments = buildComments(options, terserOptions, extractedComments);
+  }
+
+  const {
+    error,
+    map,
+    code,
+    warnings
+  } = (0, _terser.minify)({
+    [file]: input
+  }, terserOptions);
+  return {
+    error,
+    map,
+    code,
+    warnings,
+    extractedComments
+  };
+};
+
+var _default = minify;
+exports.default = _default;