Added CleanWebpackPlugin

The webpack CleanWebpackPlugin removes all files from the dist folder before each build. This is required to make sure that there are no unnecessary files in the dist folder.

webpack.config.js

@@ -1,27 +1,24 @@
-//@ts-check
-
 'use strict';
 
+const CleanWebpackPlugin = require('clean-webpack-plugin');
 const path = require('path');
 
 /**@type {import('webpack').Configuration}*/
 const config = {
-    target: 'node', // vscode extensions run in a Node.js-context 📖 -> https://webpack.js.org/configuration/node/
+    target: 'node',
 
-    entry: './src/extension.ts', // the entry point of this extension, 📖 -> https://webpack.js.org/configuration/entry-context/
+    entry: './src/extension.ts',
     output: {
-        // the bundle is stored in the 'dist' folder (check package.json), 📖 -> https://webpack.js.org/configuration/output/
         path: path.resolve(__dirname, 'dist'),
         filename: 'extension.js',
         libraryTarget: 'commonjs2',
         devtoolModuleFilenameTemplate: '../[resource-path]'
     },
     devtool: 'source-map',
     externals: {
-        vscode: 'commonjs vscode' // the vscode-module is created on-the-fly and must be excluded. Add other modules that cannot be webpack'ed, 📖 -> https://webpack.js.org/configuration/externals/
+        vscode: 'commonjs vscode'
     },
     resolve: {
-        // support reading TypeScript and JavaScript files, 📖 -> https://github.com/TypeStrong/ts-loader
         extensions: ['.ts', '.js']
     },
     module: {
@@ -39,6 +36,10 @@ const config = {
                 }]
             }
         ]
-    }
+    },
+    plugins: [
+        new CleanWebpackPlugin(),
+    ]
 };
-module.exports = config;
+
+module.exports = config;