Improve webpack 4 support

Author: andriijas

lib/plugin.js

@@ -180,6 +180,8 @@ ManifestPlugin.prototype.apply = function(compiler) {
         compiler.hooks.afterEmit.tap('ManifestPlugin', function(compilation) {
           release();
         });
+
+        compilation.hooks.webpackManifestPluginAfterEmit.call(manifest, compileCallback);
       } else {
         compiler.plugin('after-emit', function(compilation, cb) {
           release();
@@ -193,6 +195,11 @@ ManifestPlugin.prototype.apply = function(compiler) {
 
   if (compiler.hooks) {
     compiler.hooks.compilation.tap('ManifestPlugin', function (compilation) {
+
+      var SyncWaterfallHook = require('tapable').SyncWaterfallHook;
+
+      compilation.hooks.webpackManifestPluginAfterEmit = new SyncWaterfallHook(['manifest', 'compileCallback']);
+
       compilation.hooks.moduleAsset.tap('ManifestPlugin', moduleAsset);
     });
     compiler.hooks.emit.tap('ManifestPlugin', emit);

package.json

@@ -41,7 +41,8 @@
   "dependencies": {
     "fs-extra": "^0.30.0",
     "lodash": ">=3.5 <5",
-    "mutexify": "1.0.1"
+    "mutexify": "1.0.1",
+    "tapable": "^1.0.0"
   },
   "nyc": {
     "reporter": [