init-generator.ts

import chalk from "chalk";
import * as logSymbols from "log-symbols";
import * as Generator from "yeoman-generator";
import * as Inquirer from "inquirer";

import { getPackageManager } from "@webpack-cli/utils/package-manager";
import { Confirm, Input, List } from "@webpack-cli/webpack-scaffold";

import { WebpackOptions } from "./types";
import entryQuestions from "./utils/entry";
import getBabelPlugin from "./utils/module";
import getDefaultPlugins from "./utils/plugins";
import tooltip from "./utils/tooltip";

/**
 *
 * Generator for initializing a webpack config
 *
 * @class 	InitGenerator
 * @extends Generator
 * @returns {Void} After execution, transforms are triggered
 *
 */
export default class InitGenerator extends Generator {
	public usingDefaults: boolean;
	private isProd: boolean;
	private dependencies: string[];
	private configuration: {
		config: {
			configName?: string;
			topScope?: string[];
			webpackOptions?: WebpackOptions;
		};
	};

	public constructor(args, opts) {
		super(args, opts);
		this.isProd = false;
		(this.usingDefaults = false),
			(this.dependencies = [
				"webpack",
				"webpack-cli",
				"terser-webpack-plugin",
				"babel-plugin-syntax-dynamic-import"
			]);
		this.configuration = {
			config: {
				topScope: [],
				webpackOptions: {}
			}
		};
	}

	// eslint-disable-next-line
	public prompting(): any {
		const done: () => {} = this.async();
		const self: this = this;
		let regExpForStyles: string;
		let ExtractUseProps: object[];

		process.stdout.write(
			"\n" +
				logSymbols.info +
				chalk.blue(" INFO ") +
				"For more information and a detailed description of each question, have a look at " +
				chalk.bold.green("https://github.com/webpack/webpack-cli/blob/master/INIT.md") +
				"\n"
		);
		process.stdout.write(
			logSymbols.info +
				chalk.blue(" INFO ") +
				"Alternatively, run `webpack(-cli) --help` for usage info." +
				"\n\n"
		);

		this.configuration.config.webpackOptions.module = {
			rules: []
		};
		this.configuration.config.topScope.push(
			"const webpack = require('webpack')",
			"const path = require('path')",
			"\n"
		);

		return this.prompt([Confirm("entryType", "Will your application have multiple bundles?", false)])
			.then(
				(entryTypeAnswer: { entryType: boolean }): Promise<void | {}> => {
					// Ask different questions for entry points
					return entryQuestions(self, entryTypeAnswer);
				}
			)
			.then(
				(entryOptions: object | string): Promise<{}> => {
					if (typeof entryOptions === "string" && entryOptions.length > 0) {
						if (entryOptions !== "\"\"" &&  entryOptions !== "\'\'") {
							this.configuration.config.webpackOptions.entry = entryOptions;
						}
					}

					return this.prompt([
						Input("outputType", "In which folder do you want to store your generated bundles? (dist):")
					]);
				}
			)
			.then(
				(outputTypeAnswer: { outputType: string }): void => {
					// As entry is not required anymore and we dont set it to be an empty string or """""
					// it can be undefined so falsy check is enough (vs entry.length);
					if (!this.configuration.config.webpackOptions.entry && !this.usingDefaults) {
						this.configuration.config.webpackOptions.output = {
							chunkFilename: "'[name].[chunkhash].js'",
							filename: "'[name].[chunkhash].js'"
						};
					} else if (!this.usingDefaults) {
						this.configuration.config.webpackOptions.output = {
							filename: "'[name].[chunkhash].js'"
						};
					}
					if (!this.usingDefaults && outputTypeAnswer.outputType.length) {
						this.configuration.config.webpackOptions.output.path = `path.resolve(__dirname, '${
							outputTypeAnswer.outputType
						}')`;
					}
				}
			)
			.then(
				(): Promise<Inquirer.Answers> => {
					this.isProd = this.usingDefaults ? true : false;
					this.configuration.config.configName = this.isProd ? "prod" : "config";
					if (!this.isProd) {
						this.configuration.config.webpackOptions.mode = "'development'";
					}
					this.configuration.config.webpackOptions.plugins = this.isProd ? [] : getDefaultPlugins();
					return this.prompt([Confirm("babelConfirm", "Will you be using ES2015?")]);
				}
			)
			.then(
				(babelConfirmAnswer: { babelConfirm: boolean }): void => {
					if (babelConfirmAnswer.babelConfirm) {
						this.configuration.config.webpackOptions.module.rules.push(getBabelPlugin());
						this.dependencies.push("babel-loader", "@babel/core", "@babel/preset-env");
					}
				}
			)
			.then(
				(): Promise<Inquirer.Answers> => {
					return this.prompt([
						List("stylingType", "Will you use one of the below CSS solutions?", [
							"No",
							"CSS",
							"SASS",
							"LESS",
							"PostCSS"
						])
					]);
				}
			)
			.then(
				(stylingTypeAnswer: { stylingType: string }): void => {
					ExtractUseProps = [];
					switch (stylingTypeAnswer.stylingType) {
						case "SASS":
							this.dependencies.push("sass-loader", "node-sass", "style-loader", "css-loader");
							regExpForStyles = `${new RegExp(/\.(scss|css)$/)}`;
							if (this.isProd) {
								ExtractUseProps.push(
									{
										loader: "'css-loader'",
										options: {
											sourceMap: true
										}
									},
									{
										loader: "'sass-loader'",
										options: {
											sourceMap: true
										}
									}
								);
							} else {
								ExtractUseProps.push(
									{
										loader: "'style-loader'"
									},
									{
										loader: "'css-loader'"
									},
									{
										loader: "'sass-loader'"
									}
								);
							}
							break;
						case "LESS":
							regExpForStyles = `${new RegExp(/\.(less|css)$/)}`;
							this.dependencies.push("less-loader", "less", "style-loader", "css-loader");
							if (this.isProd) {
								ExtractUseProps.push(
									{
										loader: "'css-loader'",
										options: {
											sourceMap: true
										}
									},
									{
										loader: "'less-loader'",
										options: {
											sourceMap: true
										}
									}
								);
							} else {
								ExtractUseProps.push(
									{
										loader: "'css-loader'",
										options: {
											sourceMap: true
										}
									},
									{
										loader: "'less-loader'",
										options: {
											sourceMap: true
										}
									}
								);
							}
							break;
						case "PostCSS":
							this.configuration.config.topScope.push(
								tooltip.postcss(),
								"const autoprefixer = require('autoprefixer');",
								"const precss = require('precss');",
								"\n"
							);
							this.dependencies.push(
								"style-loader",
								"css-loader",
								"postcss-loader",
								"precss",
								"autoprefixer"
							);
							regExpForStyles = `${new RegExp(/\.css$/)}`;
							if (this.isProd) {
								ExtractUseProps.push(
									{
										loader: "'css-loader'",
										options: {
											importLoaders: 1,
											sourceMap: true
										}
									},
									{
										loader: "'postcss-loader'",
										options: {
											plugins: `function () {
											return [
												precss,
												autoprefixer
											];
										}`
										}
									}
								);
							} else {
								ExtractUseProps.push(
									{
										loader: "'style-loader'"
									},
									{
										loader: "'css-loader'",
										options: {
											importLoaders: 1,
											sourceMap: true
										}
									},
									{
										loader: "'postcss-loader'",
										options: {
											plugins: `function () {
											return [
												precss,
												autoprefixer
											];
										}`
										}
									}
								);
							}
							break;
						case "CSS":
							this.dependencies.push("style-loader", "css-loader");
							regExpForStyles = `${new RegExp(/\.css$/)}`;
							if (this.isProd) {
								ExtractUseProps.push({
									loader: "'css-loader'",
									options: {
										sourceMap: true
									}
								});
							} else {
								ExtractUseProps.push(
									{
										loader: "'style-loader'",
										options: {
											sourceMap: true
										}
									},
									{
										loader: "'css-loader'"
									}
								);
							}
							break;
						default:
							regExpForStyles = null;
					}
				}
			)
			.then(
				(): Promise<Inquirer.Answers> => {
					if (this.isProd) {
						// Ask if the user wants to use extractPlugin
						return this.prompt([
							Input(
								"extractPlugin",
								"If you want to bundle your CSS files, what will you name the bundle? (press enter to skip)"
							)
						]);
					}
				}
			)
			.then(
				(extractPluginAnswer: { extractPlugin: string }): void => {
					if (regExpForStyles) {
						if (this.isProd) {
							const cssBundleName: string = extractPluginAnswer.extractPlugin;
							this.configuration.config.topScope.push(tooltip.cssPlugin());
							this.dependencies.push("mini-css-extract-plugin");

							if (cssBundleName.length !== 0) {
								(this.configuration.config.webpackOptions.plugins as string[]).push(
									// TODO: use [contenthash] after it is supported
									`new MiniCssExtractPlugin({ filename:'${cssBundleName}.[chunkhash].css' })`
								);
							} else {
								(this.configuration.config.webpackOptions.plugins as string[]).push(
									"new MiniCssExtractPlugin({ filename:'style.css' })"
								);
							}

							ExtractUseProps.unshift({
								loader: "MiniCssExtractPlugin.loader"
							});

							const moduleRulesObj = {
								test: regExpForStyles,
								use: ExtractUseProps
							};

							this.configuration.config.webpackOptions.module.rules.push(moduleRulesObj);
							this.configuration.config.topScope.push(
								"const MiniCssExtractPlugin = require('mini-css-extract-plugin');",
								"\n"
							);
						} else {
							const moduleRulesObj: {
								test: string;
								use: object[];
							} = {
								test: regExpForStyles,
								use: ExtractUseProps
							};

							this.configuration.config.webpackOptions.module.rules.push(moduleRulesObj);
						}
					}
					// add splitChunks options for transparency
					// defaults coming from: https://webpack.js.org/plugins/split-chunks-plugin/#optimization-splitchunks
					this.configuration.config.topScope.push(tooltip.splitChunks());
					this.configuration.config.webpackOptions.optimization = {
						splitChunks: {
							cacheGroups: {
								vendors: {
									priority: -10,
									test: "/[\\\\/]node_modules[\\\\/]/"
								}
							},
							chunks: "'async'",
							minChunks: 1,
							minSize: 30000,
							// for production name is recommended to be off
							name: !this.isProd
						}
					};
					done();
				}
			);
	}
	public installPlugins(): void {
		if (this.isProd) {
			this.dependencies = this.dependencies.filter((p: string): boolean => p !== "terser-webpack-plugin");
		} else {
			this.configuration.config.topScope.push(
				tooltip.terser(),
				"const TerserPlugin = require('terser-webpack-plugin');",
				"\n"
			);
		}
		const packager = getPackageManager();
		const opts: {
			dev?: boolean;
			"save-dev"?: boolean;
		} = packager === "yarn" ? { dev: true } : { "save-dev": true };
		this.scheduleInstallTask(packager, this.dependencies, opts);
	}

	public writing(): void {
		this.config.set("configuration", this.configuration);
	}
}