webpack/lib/runtime/StartupChunkDependenciesPlugin.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support 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
*/

"use strict";

const RuntimeGlobals = require("../RuntimeGlobals");
const StartupChunkDependenciesRuntimeModule = require("./StartupChunkDependenciesRuntimeModule");
const StartupEntrypointRuntimeModule = require("./StartupEntrypointRuntimeModule");

/** @typedef {import("../Compiler")} Compiler */

class StartupChunkDependenciesPlugin {
	constructor(options) {
		this.chunkLoading = options.chunkLoading;
		this.asyncChunkLoading =
			typeof options.asyncChunkLoading === "boolean"
				? options.asyncChunkLoading
				: true;
	}

	/**
	 * Apply the plugin
	 * @param {Compiler} compiler the compiler instance
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.thisCompilation.tap(
			"StartupChunkDependenciesPlugin",
			compilation => {
				const globalChunkLoading = compilation.outputOptions.chunkLoading;
				const isEnabledForChunk = chunk => {
					const options = chunk.getEntryOptions();
					const chunkLoading =
						options && options.chunkLoading !== undefined
							? options.chunkLoading
							: globalChunkLoading;
					return chunkLoading === this.chunkLoading;
				};
				compilation.hooks.additionalTreeRuntimeRequirements.tap(
					"StartupChunkDependenciesPlugin",
					(chunk, set, { chunkGraph }) => {
						if (!isEnabledForChunk(chunk)) return;
						if (chunkGraph.hasChunkEntryDependentChunks(chunk)) {
							set.add(RuntimeGlobals.startup);
							set.add(RuntimeGlobals.ensureChunk);
							set.add(RuntimeGlobals.ensureChunkIncludeEntries);
							compilation.addRuntimeModule(
								chunk,
								new StartupChunkDependenciesRuntimeModule(
									this.asyncChunkLoading
								)
							);
						}
					}
				);
				compilation.hooks.runtimeRequirementInTree
					.for(RuntimeGlobals.startupEntrypoint)
					.tap("StartupChunkDependenciesPlugin", (chunk, set) => {
						if (!isEnabledForChunk(chunk)) return;
						set.add(RuntimeGlobals.require);
						set.add(RuntimeGlobals.ensureChunk);
						set.add(RuntimeGlobals.ensureChunkIncludeEntries);
						compilation.addRuntimeModule(
							chunk,
							new StartupEntrypointRuntimeModule(this.asyncChunkLoading)
						);
					});
			}
		);
	}
}

module.exports = StartupChunkDependenciesPlugin;