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

	"use strict";

	const CachedInputFileSystem = require("enhanced-resolve/lib/CachedInputFileSystem");
	const fs = require("graceful-fs");
	const createConsoleLogger = require("../logging/createConsoleLogger");
	const NodeWatchFileSystem = require("./NodeWatchFileSystem");
	const nodeConsole = require("./nodeConsole");

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

	class NodeEnvironmentPlugin {
	constructor(options) {
	this.options = options \|\| {};
	}

	/**
	* Apply the plugin
	* @param {Compiler} compiler the compiler instance
	* @returns {void}
	*/
	apply(compiler) {
	compiler.infrastructureLogger = createConsoleLogger(
	Object.assign(
	{
	level: "info",
	debug: false,
	console: nodeConsole
	},
	this.options.infrastructureLogging
	)
	);
	compiler.inputFileSystem = new CachedInputFileSystem(fs, 60000);
	const inputFileSystem = compiler.inputFileSystem;
	compiler.outputFileSystem = fs;
	compiler.intermediateFileSystem = fs;
	compiler.watchFileSystem = new NodeWatchFileSystem(
	compiler.inputFileSystem
	);
	compiler.hooks.beforeRun.tap("NodeEnvironmentPlugin", compiler => {
	if (compiler.inputFileSystem === inputFileSystem) {
	inputFileSystem.purge();
	}
	});
	}
	}

	module.exports = NodeEnvironmentPlugin;