import { DefinePlugin } from 'webpack';
import * as nodeExternals from 'webpack-node-externals';
import * as copyPlugin from 'copy-webpack-plugin';
import { resolve } from 'path';

function transform_package(input: Buffer): string {
	const pkg = JSON.parse(input.toString());
	delete pkg['devDependencies'];
	delete pkg['jest'];
	pkg['scripts'] = {
		start: 'node server.js'
	};
	return JSON.stringify(pkg);
}

export default {
	entry: './src/main.ts',
	plugins: [
		new DefinePlugin({
			PROD: JSON.stringify(true)
		}),
		new copyPlugin({
			patterns: [
				{
					from: resolve(__dirname, 'package.json'),
					to: resolve(__dirname, 'dist', 'package.json'),
					transform: transform_package
				},
				{
					from: resolve(__dirname, 'yarn.lock'),
					to: resolve(__dirname, 'dist', 'yarn.lock')
				}
			]
		})
	],
	module: {
		rules: [
			{
				test: /\.ts?$/,
				use: 'ts-loader'
			}
		]
	},
	externalsPresets: { node: true },
	mode: 'production',
	devtool: 'inline-source-map',
	resolve: {
		extensions: ['.ts', '.js']
	},
	output: {
		filename: 'server.js',
		path: resolve(__dirname, 'dist')
	},
	externals: [nodeExternals()]
};