use childCompilerHash to replace [hash] in filename

index.js

@@ -55,7 +55,6 @@ HtmlWebpackPlugin.prototype.apply = function (compiler) {
         // If the compilation change didnt change the cache is valid
         isCompilationCached = compilationResult.hash && self.childCompilerHash === compilationResult.hash;
         self.childCompilerHash = compilationResult.hash;
-        self.options.filename = self.options.filename.replace(/\[hash\]/g, compilationResult.hash);
         callback();
         return compilationResult.content;
       });
@@ -150,20 +149,22 @@ HtmlWebpackPlugin.prototype.apply = function (compiler) {
         return self.options.showErrors ? prettyError(err, compiler.context).toHtml() : 'ERROR';
       })
       .then(function (html) {
+        var outputFilename = self.options.filename.replace(/\[hash\]/g, self.childCompilerHash)
         // Replace the compilation result with the evaluated html code
-        compilation.assets[self.options.filename] = {
+        compilation.assets[outputFilename] = {
           source: function () {
             return html;
           },
           size: function () {
             return html.length;
           }
         };
+        return outputFilename;
       })
-      .then(function () {
+      .then(function (outputFilename) {
         // Let other plugins know that we are done:
         return applyPluginsAsyncWaterfall('html-webpack-plugin-after-emit', {
-          html: compilation.assets[self.options.filename],
+          html: compilation.assets[outputFilename],
           plugin: self
         });
       })