webpack.config.default.js

//@ts-check
/** @typedef {import('webpack').Configuration} WebpackConfig **/

"use strict"

const path = require("path")
const merge = require("merge-options")
const nodeExternals = require("webpack-node-externals")

module.exports = function withDefaults(/**@type WebpackConfig*/extConfig) {

  /** @type WebpackConfig */
  let defaultConfig = {
    mode: "none", // this leaves the source code as close as possible to the original (when packaging we set this to 'production')
    target: "node", // extensions run in a node context
    node: {
      __dirname: false, // leave the __dirname-behaviour intact
    },
    resolve: {
      mainFields: ["module", "main"],
      extensions: [".ts", ".js", ".node"], // support ts-files and js-files
    },
    module: {
      rules: [
        {
          test: /\.ts$/,
          exclude: /node_modules/,
          use: [
            {
              // configure TypeScript loader:
              // * enable sources maps for end-to-end source maps
              loader: "ts-loader",
              options: {
                compilerOptions: {
                  "sourceMap": true,
                },
              },
            },
          ],
        },
        {
          test: /\.node$/,
          loader: "node-loader",
        },
      ],
    },
    externalsPresets: { node: true },
    externals: [
      {
        "vscode": "commonjs vscode", // ignored because it doesn't exist
      },
      nodeExternals(),
    ],
    output: {
      // all output goes into `dist`.
      // packaging depends on that and this must always be like it
      filename: "[name].js",
      path: path.join(extConfig.context, "out"),
      libraryTarget: "commonjs",
    },
    // yes, really source maps
    devtool: "source-map",
  }

  return merge(defaultConfig, extConfig)
}