From eac6d022f5d9c02404285db71f20313bc4430f58 Mon Sep 17 00:00:00 2001
From: Clark Du <clark.duxin@gmail.com>
Date: Thu, 7 Feb 2019 17:26:43 +0000
Subject: [PATCH] refactor: remove unnecessary onEmit in old webpack

---
 packages/webpack/src/plugins/vue/client.js |  4 ++--
 packages/webpack/src/plugins/vue/server.js |  4 ++--
 packages/webpack/src/plugins/vue/util.js   | 10 ----------
 3 files changed, 4 insertions(+), 14 deletions(-)

diff --git a/packages/webpack/src/plugins/vue/client.js b/packages/webpack/src/plugins/vue/client.js
index cd33e7a010..561d19b649 100644
--- a/packages/webpack/src/plugins/vue/client.js
+++ b/packages/webpack/src/plugins/vue/client.js
@@ -6,7 +6,7 @@
 import hash from 'hash-sum'
 import uniq from 'lodash/uniq'
 
-import { isJS, isCSS, onEmit } from './util'
+import { isJS, isCSS } from './util'
 
 export default class VueSSRClientPlugin {
   constructor(options = {}) {
@@ -16,7 +16,7 @@ export default class VueSSRClientPlugin {
   }
 
   apply(compiler) {
-    onEmit(compiler, 'vue-client-plugin', (compilation, cb) => {
+    compiler.hooks.emit.tapAsync('vue-client-plugin', (compilation, cb) => {
       const stats = compilation.getStats().toJson()
 
       const allFiles = uniq(stats.assets
diff --git a/packages/webpack/src/plugins/vue/server.js b/packages/webpack/src/plugins/vue/server.js
index 422df372bd..00ac888029 100644
--- a/packages/webpack/src/plugins/vue/server.js
+++ b/packages/webpack/src/plugins/vue/server.js
@@ -1,4 +1,4 @@
-import { validate, isJS, onEmit } from './util'
+import { validate, isJS } from './util'
 
 export default class VueSSRServerPlugin {
   constructor(options = {}) {
@@ -10,7 +10,7 @@ export default class VueSSRServerPlugin {
   apply(compiler) {
     validate(compiler)
 
-    onEmit(compiler, 'vue-server-plugin', (compilation, cb) => {
+    compiler.hooks.emit.tapAsync('vue-server-plugin', (compilation, cb) => {
       const stats = compilation.getStats().toJson()
       const [entryName] = Object.keys(stats.entrypoints)
       const entryInfo = stats.entrypoints[entryName]
diff --git a/packages/webpack/src/plugins/vue/util.js b/packages/webpack/src/plugins/vue/util.js
index 18b62b645d..7db9feb8f8 100644
--- a/packages/webpack/src/plugins/vue/util.js
+++ b/packages/webpack/src/plugins/vue/util.js
@@ -22,16 +22,6 @@ export const validate = (compiler) => {
   }
 }
 
-export const onEmit = (compiler, name, hook) => {
-  if (compiler.hooks) {
-    // Webpack >= 4.0.0
-    compiler.hooks.emit.tapAsync(name, hook)
-  } else {
-    // Webpack < 4.0.0
-    compiler.plugin('emit', hook)
-  }
-}
-
 export const isJS = file => /\.js(\?[^.]+)?$/.test(file)
 
 export const isCSS = file => /\.css(\?[^.]+)?$/.test(file)