add clean-webpack-plugin

kanban-client/package.json

@@ -41,6 +41,7 @@
     "babel-preset-stage-0": "^6.24.1",
     "babel-register": "^6.24.1",
     "babel-runtime": "^6.23.0",
+    "clean-webpack-plugin": "^3.0.0",
     "coveralls": "^2.11.15",
     "css3transform": "^1.1.7",
     "enzyme": "^2.7.0",

kanban-client/webpack.config.js

@@ -2,6 +2,7 @@ var path = require('path');
 var webpack = require('webpack');
 var ExtractTextPlugin = require('extract-text-webpack-plugin');
 var HtmlWebpackPlugin = require('html-webpack-plugin');
+var { CleanWebpackPlugin } = require('clean-webpack-plugin');
 
 module.exports = {
     entry: {
@@ -44,6 +45,8 @@ module.exports = {
         ]
     },
     plugins: [
+        // 清除前一次打包文件
+        new CleanWebpackPlugin(),
         // webapck配置
         new webpack.LoaderOptionsPlugin({
             options: {