AutomaticPrefetchPlugin.js
No OneTemporary
Actions

Subscribers

None

File Metadata

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

	"use strict";

	const asyncLib = require("neo-async");
	const NormalModule = require("./NormalModule");
	const PrefetchDependency = require("./dependencies/PrefetchDependency");

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

	class AutomaticPrefetchPlugin {
	/**
	* Apply the plugin
	* @param {Compiler} compiler the compiler instance
	* @returns {void}
	*/
	apply(compiler) {
	compiler.hooks.compilation.tap(
	"AutomaticPrefetchPlugin",
	(compilation, { normalModuleFactory }) => {
	compilation.dependencyFactories.set(
	PrefetchDependency,
	normalModuleFactory
	);
	}
	);
	let lastModules = null;
	compiler.hooks.afterCompile.tap("AutomaticPrefetchPlugin", compilation => {
	lastModules = Array.from(compilation.modules)
	.filter(m => m instanceof NormalModule)
	.map((/** @type {NormalModule} */ m) => ({
	context: m.context,
	request: m.request
	}));
	});
	compiler.hooks.make.tapAsync(
	"AutomaticPrefetchPlugin",
	(compilation, callback) => {
	if (!lastModules) return callback();
	asyncLib.forEach(
	lastModules,
	(m, callback) => {
	compilation.addModuleChain(
	m.context \|\| compiler.context,
	new PrefetchDependency(m.request),
	callback
	);
	},
	callback
	);
	}
	);
	}
	}
	module.exports = AutomaticPrefetchPlugin;