webpack/lib/prefetch/ChunkPrefetchPreloadPlugin.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
	Author Tobias Koppers @sokra
*/

"use strict";

const RuntimeGlobals = require("../RuntimeGlobals");
const ChunkPrefetchFunctionRuntimeModule = require("./ChunkPrefetchFunctionRuntimeModule");
const ChunkPrefetchStartupRuntimeModule = require("./ChunkPrefetchStartupRuntimeModule");
const ChunkPrefetchTriggerRuntimeModule = require("./ChunkPrefetchTriggerRuntimeModule");

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

class ChunkPrefetchPreloadPlugin {
	/**
	 * @param {Compiler} compiler the compiler
	 * @returns {void}
	 */
	apply(compiler) {
		compiler.hooks.compilation.tap(
			"ChunkPrefetchPreloadPlugin",
			compilation => {
				compilation.hooks.additionalChunkRuntimeRequirements.tap(
					"ChunkPrefetchPreloadPlugin",
					(chunk, set) => {
						const { chunkGraph } = compilation;
						if (chunkGraph.getNumberOfEntryModules(chunk) === 0) return;
						const startupChildChunks = chunk.getChildIdsByOrders(chunkGraph);
						if (startupChildChunks.prefetch) {
							set.add(RuntimeGlobals.prefetchChunk);
							set.add(RuntimeGlobals.startup);
							compilation.addRuntimeModule(
								chunk,
								new ChunkPrefetchStartupRuntimeModule(
									"prefetch",
									RuntimeGlobals.prefetchChunk,
									startupChildChunks.prefetch
								)
							);
						}
					}
				);
				compilation.hooks.additionalTreeRuntimeRequirements.tap(
					"ChunkPrefetchPreloadPlugin",
					(chunk, set) => {
						const { chunkGraph } = compilation;
						const chunkMap = chunk.getChildIdsByOrdersMap(chunkGraph, false);

						if (chunkMap.prefetch) {
							set.add(RuntimeGlobals.prefetchChunk);
							compilation.addRuntimeModule(
								chunk,
								new ChunkPrefetchTriggerRuntimeModule(
									"prefetch",
									RuntimeGlobals.prefetchChunk,
									chunkMap.prefetch,
									true
								)
							);
						}
						if (chunkMap.preload) {
							set.add(RuntimeGlobals.preloadChunk);
							compilation.addRuntimeModule(
								chunk,
								new ChunkPrefetchTriggerRuntimeModule(
									"preload",
									RuntimeGlobals.preloadChunk,
									chunkMap.preload,
									false
								)
							);
						}
					}
				);
				compilation.hooks.runtimeRequirementInTree
					.for(RuntimeGlobals.prefetchChunk)
					.tap("ChunkPrefetchPreloadPlugin", (chunk, set) => {
						compilation.addRuntimeModule(
							chunk,
							new ChunkPrefetchFunctionRuntimeModule(
								"prefetch",
								RuntimeGlobals.prefetchChunk,
								RuntimeGlobals.prefetchChunkHandlers
							)
						);
						set.add(RuntimeGlobals.prefetchChunkHandlers);
					});
				compilation.hooks.runtimeRequirementInTree
					.for(RuntimeGlobals.preloadChunk)
					.tap("ChunkPrefetchPreloadPlugin", (chunk, set) => {
						compilation.addRuntimeModule(
							chunk,
							new ChunkPrefetchFunctionRuntimeModule(
								"preload",
								RuntimeGlobals.preloadChunk,
								RuntimeGlobals.preloadChunkHandlers
							)
						);
						set.add(RuntimeGlobals.preloadChunkHandlers);
					});
			}
		);
	}
}

module.exports = ChunkPrefetchPreloadPlugin;