lib/source-maps.js

   1 'use strict';
   2
   3 var Promise = require('bluebird');
   4
   5 var fs = require('fs');
   6
   7 var path = require('path');
   8
   9 var debug_ = require('debug');
  10
  11 var debugVerbose = debug_('purs-loader:verbose');
  12
  13 module.exports = function sourceMap(psModule, js) {
  14   var options = psModule.options;
  15
  16   var jsPath = psModule.jsPath;
  17
  18   var srcPath = psModule.srcPath;
  19
  20   var source = psModule.source;
  21
  22   var remainingRequest = psModule.remainingRequest;
  23
  24   var sourceMapPath = path.join(path.dirname(jsPath), 'index.js.map');
  25
  26   var isSourceMapsEnabled = options.pscArgs && options.pscArgs.sourceMaps;
  27
  28   return new Promise(function (resolve, reject) {
  29     if (!isSourceMapsEnabled) {
  30       resolve({
  31         js: js,
  32         map: undefined
  33       });
  34     } else {
  35       debugVerbose('loading source map %s', sourceMapPath);
  36
  37       fs.readFile(sourceMapPath, 'utf-8', function (error, result) {
  38         if (error) {
  39           reject(error);
  40         } else {
  41           try {
  42             var map = Object.assign(JSON.parse(result), {
  43               sources: [remainingRequest],
  44               file: path.normalize(srcPath),
  45               sourcesContent: [source]
  46             });
  47
  48             var jsRemovedMapUrl = js.replace(/^\/\/# sourceMappingURL=[^\r\n]*/gm, '');
  49
  50             resolve({
  51               js: jsRemovedMapUrl,
  52               map: map
  53             });
  54           } catch (error) {
  55             reject(error);
  56           }
  57         }
  58       });
  59     }
  60   });
  61 };