uglifyjs-webpack-plugin/dist/minify.js

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _uglifyJs = require('uglify-js');

var _uglifyJs2 = _interopRequireDefault(_uglifyJs);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

const buildUglifyOptions = ({
  warnings,
  parse = {},
  compress = {},
  mangle,
  output,
  toplevel,
  nameCache,
  ie8,
  /* eslint-disable camelcase */
  keep_fnames
  /* eslint-enable camelcase */
} = {}) => ({
  warnings,
  parse: Object.assign({}, parse),
  compress: typeof compress === 'boolean' ? compress : Object.assign({}, compress),
  // eslint-disable-next-line no-nested-ternary
  mangle: mangle == null ? true : typeof mangle === 'boolean' ? mangle : Object.assign({}, mangle),
  output: Object.assign({
    shebang: true,
    comments: false,
    beautify: false,
    semicolons: true
  }, output),
  // Ignoring sourceMap from options
  sourceMap: null,
  toplevel,
  nameCache,
  ie8,
  keep_fnames
}); /* eslint-disable
      arrow-body-style
    */


const buildComments = (options, uglifyOptions, extractedComments) => {
  const condition = {};
  const commentsOpts = uglifyOptions.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)) {
      extractedComments.push(comment.type === 'comment2' ? `/*${comment.value}*/` : `//${comment.value}`);
    }

    return condition.preserve(astNode, comment);
  };
};

const minify = options => {
  const {
    file,
    input,
    inputSourceMap,
    extractComments,
    minify: minifyFn
  } = options;

  if (minifyFn) {
    return minifyFn({ [file]: input }, inputSourceMap);
  }

  // Copy uglify options
  const uglifyOptions = buildUglifyOptions(options.uglifyOptions);

  // Add source map data
  if (inputSourceMap) {
    uglifyOptions.sourceMap = {
      content: inputSourceMap
    };
  }

  const extractedComments = [];

  if (extractComments) {
    uglifyOptions.output.comments = buildComments(options, uglifyOptions, extractedComments);
  }

  const { error, map, code, warnings } = _uglifyJs2.default.minify({ [file]: input }, uglifyOptions);

  return { error, map, code, warnings, extractedComments };
};

exports.default = minify;