webpack/lib/EntryOptionPlugin.js

Packs ECMAScript/CommonJs/AMD modules for the browser. Allows you to split your codebase into multiple bundles, which can be loaded on demand. Supports loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

/** @typedef {import("../declarations/WebpackOptions").EntryDescriptionNormalized} EntryDescription */
/** @typedef {import("../declarations/WebpackOptions").EntryNormalized} Entry */
/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("./Entrypoint").EntryOptions} EntryOptions */

class EntryOptionPlugin {
	/**
	 * @param {Compiler} compiler the compiler instance one is tapping into
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.entryOption.tap("EntryOptionPlugin", (context, entry) => {
			EntryOptionPlugin.applyEntryOption(compiler, context, entry);
			return true;
		});
	}

	/**
	 * @param {Compiler} compiler the compiler
	 * @param {string} context context directory
	 * @param {Entry} entry request
	 * @returns {void}
	 */
	static applyEntryOption(compiler, context, entry) {
		if (typeof entry === "function") {
			const DynamicEntryPlugin = require("./DynamicEntryPlugin");
			new DynamicEntryPlugin(context, entry).apply(compiler);
		} else {
			const EntryPlugin = require("./EntryPlugin");
			for (const name of Object.keys(entry)) {
				const desc = entry[name];
				const options = EntryOptionPlugin.entryDescriptionToOptions(
					compiler,
					name,
					desc
				);
				const descImport =
					/** @type {Exclude<EntryDescription["import"], undefined>} */
					(desc.import);
				for (const entry of descImport) {
					new EntryPlugin(context, entry, options).apply(compiler);
				}
			}
		}
	}

	/**
	 * @param {Compiler} compiler the compiler
	 * @param {string} name entry name
	 * @param {EntryDescription} desc entry description
	 * @returns {EntryOptions} options for the entry
	 */
	static entryDescriptionToOptions(compiler, name, desc) {
		/** @type {EntryOptions} */
		const options = {
			name,
			filename: desc.filename,
			runtime: desc.runtime,
			layer: desc.layer,
			dependOn: desc.dependOn,
			baseUri: desc.baseUri,
			publicPath: desc.publicPath,
			chunkLoading: desc.chunkLoading,
			asyncChunks: desc.asyncChunks,
			wasmLoading: desc.wasmLoading,
			library: desc.library
		};
		if (desc.layer !== undefined && !compiler.options.experiments.layers) {
			throw new Error(
				"'entryOptions.layer' is only allowed when 'experiments.layers' is enabled"
			);
		}
		if (desc.chunkLoading) {
			const EnableChunkLoadingPlugin = require("./javascript/EnableChunkLoadingPlugin");
			EnableChunkLoadingPlugin.checkEnabled(compiler, desc.chunkLoading);
		}
		if (desc.wasmLoading) {
			const EnableWasmLoadingPlugin = require("./wasm/EnableWasmLoadingPlugin");
			EnableWasmLoadingPlugin.checkEnabled(compiler, desc.wasmLoading);
		}
		if (desc.library) {
			const EnableLibraryPlugin = require("./library/EnableLibraryPlugin");
			EnableLibraryPlugin.checkEnabled(compiler, desc.library.type);
		}
		return options;
	}
}

module.exports = EntryOptionPlugin;