webpack.config.js

//@ts-check

'use strict';

const path = require('path');

/**@type {import('webpack').Configuration}*/
const config = {
  target: 'node',

  entry: './ext-src/extension.ts', 
  output: {
    path: path.resolve(__dirname, 'build'),
    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/
    typescript: 'commonjs typescript'
  },
  resolve: {
    extensions: ['.ts', '.js']
  },
  module: {
    rules: [
      {
        test: /\.ts$/,
        exclude: /node_modules/,
        use: [
          {
            loader: 'ts-loader',
            options: { configFile: "tsconfig.extension.json" }
          }
        ]
      }
    ]
  }
};
module.exports = config;