added clean-webpack-plugin to webpack build base

build/webpack.config.base.js

@@ -4,6 +4,7 @@ const { VueLoaderPlugin } = require('vue-loader')
 const ESLintPlugin = require('eslint-webpack-plugin');
 const ExtraneousFileCleanupPlugin = require('webpack-extraneous-file-cleanup-plugin');
 const CompressionPlugin = require("compression-webpack-plugin");
+const { CleanWebpackPlugin } = require('clean-webpack-plugin');
 
 const utils = require('./utils')
 
@@ -159,5 +160,17 @@ module.exports = {
       minBytes: 4096
     }),
     new CompressionPlugin(),
+    /**
+     * All files inside webpack's output.path directory will be removed once, but the
+     * directory itself will not be. If using webpack 4+'s default configuration,
+     * everything under <PROJECT_DIR>/dist/ will be removed.
+     * Use cleanOnceBeforeBuildPatterns to override this behavior.
+     *
+     * During rebuilds, all webpack assets that are not used anymore
+     * will be removed automatically.
+     *
+     * See `Options and Defaults` for information
+     */
+     new CleanWebpackPlugin(),
   ]
 }