fix: Can't resolve 'fs' when bundle with webpack #447

This is a webpack core level problem. Hackfixing for now.

Closes #447.

lib/convert-source-map.js

@@ -0,0 +1,143 @@
+/* eslint-disable */
+'use strict';
+// XXXXX: This file should not exist. Working around a core level bug
+// that prevents using fs at loaders.
+//var fs = require('fs'); // XXX
+var path = require('path');
+
+var commentRx = /^\s*\/(?:\/|\*)[@#]\s+sourceMappingURL=data:(?:application|text)\/json;(?:charset[:=]\S+?;)?base64,(?:.*)$/mg;
+var mapFileCommentRx =
+  //Example (Extra space between slashes added to solve Safari bug. Exclude space in production):
+  //     / /# sourceMappingURL=foo.js.map           /*# sourceMappingURL=foo.js.map */
+  /(?:\/\/[@#][ \t]+sourceMappingURL=([^\s'"]+?)[ \t]*$)|(?:\/\*[@#][ \t]+sourceMappingURL=([^\*]+?)[ \t]*(?:\*\/){1}[ \t]*$)/mg
+
+function decodeBase64(base64) {
+  return new Buffer(base64, 'base64').toString();
+}
+
+function stripComment(sm) {
+  return sm.split(',').pop();
+}
+
+function readFromFileMap(sm, dir) {
+  // NOTE: this will only work on the server since it attempts to read the map file
+
+  mapFileCommentRx.lastIndex = 0;
+  var r = mapFileCommentRx.exec(sm);
+
+  // for some odd reason //# .. captures in 1 and /* .. */ in 2
+  var filename = r[1] || r[2];
+  var filepath = path.resolve(dir, filename);
+
+  try {
+    return fs.readFileSync(filepath, 'utf8');
+  } catch (e) {
+    throw new Error('An error occurred while trying to read the map file at ' + filepath + '\n' + e);
+  }
+}
+
+function Converter (sm, opts) {
+  opts = opts || {};
+
+  if (opts.isFileComment) sm = readFromFileMap(sm, opts.commentFileDir);
+  if (opts.hasComment) sm = stripComment(sm);
+  if (opts.isEncoded) sm = decodeBase64(sm);
+  if (opts.isJSON || opts.isEncoded) sm = JSON.parse(sm);
+
+  this.sourcemap = sm;
+}
+
+Converter.prototype.toJSON = function (space) {
+  return JSON.stringify(this.sourcemap, null, space);
+};
+
+Converter.prototype.toBase64 = function () {
+  var json = this.toJSON();
+  return new Buffer(json).toString('base64');
+};
+
+Converter.prototype.toComment = function (options) {
+  var base64 = this.toBase64();
+  var data = 'sourceMappingURL=data:application/json;charset=utf-8;base64,' + base64;
+  return options && options.multiline ? '/*# ' + data + ' */' : '//# ' + data;
+};
+
+// returns copy instead of original
+Converter.prototype.toObject = function () {
+  return JSON.parse(this.toJSON());
+};
+
+Converter.prototype.addProperty = function (key, value) {
+  if (this.sourcemap.hasOwnProperty(key)) throw new Error('property %s already exists on the sourcemap, use set property instead');
+  return this.setProperty(key, value);
+};
+
+Converter.prototype.setProperty = function (key, value) {
+  this.sourcemap[key] = value;
+  return this;
+};
+
+Converter.prototype.getProperty = function (key) {
+  return this.sourcemap[key];
+};
+
+exports.fromObject = function (obj) {
+  return new Converter(obj);
+};
+
+exports.fromJSON = function (json) {
+  return new Converter(json, { isJSON: true });
+};
+
+exports.fromBase64 = function (base64) {
+  return new Converter(base64, { isEncoded: true });
+};
+
+exports.fromComment = function (comment) {
+  comment = comment
+    .replace(/^\/\*/g, '//')
+    .replace(/\*\/$/g, '');
+
+  return new Converter(comment, { isEncoded: true, hasComment: true });
+};
+
+exports.fromMapFileComment = function (comment, dir) {
+  return new Converter(comment, { commentFileDir: dir, isFileComment: true, isJSON: true });
+};
+
+// Finds last sourcemap comment in file or returns null if none was found
+exports.fromSource = function (content) {
+  var m = content.match(commentRx);
+  return m ? exports.fromComment(m.pop()) : null;
+};
+
+// Finds last sourcemap comment in file or returns null if none was found
+exports.fromMapFileSource = function (content, dir) {
+  var m = content.match(mapFileCommentRx);
+  return m ? exports.fromMapFileComment(m.pop(), dir) : null;
+};
+
+exports.removeComments = function (src) {
+  return src.replace(commentRx, '');
+};
+
+exports.removeMapFileComments = function (src) {
+  return src.replace(mapFileCommentRx, '');
+};
+
+exports.generateMapFileComment = function (file, options) {
+  var data = 'sourceMappingURL=' + file;
+  return options && options.multiline ? '/*# ' + data + ' */' : '//# ' + data;
+};
+
+Object.defineProperty(exports, 'commentRegex', {
+  get: function getCommentRegex () {
+    return commentRx;
+  }
+});
+
+Object.defineProperty(exports, 'mapFileCommentRegex', {
+  get: function getMapFileCommentRegex () {
+    return mapFileCommentRx;
+  }
+});

lib/css-base.js

@@ -53,7 +53,7 @@ function cssWithMappingToString(item) {
 	if (!cssMapping) {
 		return content;
 	}
-	var convertSourceMap = require('convert-source-map');
+	var convertSourceMap = require('./convert-source-map');
 	var sourceMapping = convertSourceMap.fromObject(cssMapping).toComment({multiline: true});
 	var sourceURLs = cssMapping.sources.map(function (source) {
 		return '/*# sourceURL=' + cssMapping.sourceRoot + source + ' */'