cache-bust source maps

Author: yyx990803

lib/parser.js

@@ -4,10 +4,13 @@ var cache = require('lru-cache')(100)
 var SourceNode = require('source-map').SourceNode
 var SourceMapGenerator = require('source-map').SourceMapGenerator
 var splitRE = /\n\r|\n|\r/g
+var hash = require('hash-sum')
 
 module.exports = function (content, filename) {
 
-  var cacheKey = filename + 'XXX' + content
+  var cacheKey = hash(filename + content)
+  // source-map cache busting for hot-reloadded modules
+  var filenameWithHash = filename + '?' + cacheKey
   var output = cache.get(cacheKey)
   if (output) return output
 
@@ -80,11 +83,11 @@ module.exports = function (content, filename) {
     var result = content.slice(start, end)
     var lineOffset = content.slice(0, start).split(splitRE).length - 1
     var map = new SourceMapGenerator()
-    map.setSourceContent(filename, content)
+    map.setSourceContent(filenameWithHash, content)
 
     result.split(splitRE).forEach(function (line, index) {
       map.addMapping({
-        source: filename,
+        source: filenameWithHash,
         original: {
           line: index + 1 + lineOffset,
           column: 0