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

	"use strict";

	const PrefetchDependency = require("./dependencies/PrefetchDependency");

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

	class PrefetchPlugin {
	constructor(context, request) {
	if (request) {
	this.context = context;
	this.request = request;
	} else {
	this.context = null;
	this.request = context;
	}
	}

	/**
	* Apply the plugin
	* @param {Compiler} compiler the compiler instance
	* @returns {void}
	*/
	apply(compiler) {
	compiler.hooks.compilation.tap(
	"PrefetchPlugin",
	(compilation, { normalModuleFactory }) => {
	compilation.dependencyFactories.set(
	PrefetchDependency,
	normalModuleFactory
	);
	}
	);
	compiler.hooks.make.tapAsync("PrefetchPlugin", (compilation, callback) => {
	compilation.addModuleChain(
	this.context \|\| compiler.context,
	new PrefetchDependency(this.request),
	err => {
	callback(err);
	}
	);
	});
	}
	}

	module.exports = PrefetchPlugin;