FileExistsPlugin.js
583449d99081issn4frontend

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

			"use strict";

			/** @typedef {import("./Resolver")} Resolver */
			/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */

			module.exports = class FileExistsPlugin {
			/**
			* @param {string \| ResolveStepHook} source source
			* @param {string \| ResolveStepHook} target target
			*/
			constructor(source, target) {
			this.source = source;
			this.target = target;
			}

			/**
			* @param {Resolver} resolver the resolver
			* @returns {void}
			*/
			apply(resolver) {
			const target = resolver.ensureHook(this.target);
			const fs = resolver.fileSystem;
			resolver
			.getHook(this.source)
			.tapAsync("FileExistsPlugin", (request, resolveContext, callback) => {
			const file = request.path;
			if (!file) return callback();
			fs.stat(file, (err, stat) => {
			if (err \|\| !stat) {
			if (resolveContext.missingDependencies)
			resolveContext.missingDependencies.add(file);
			if (resolveContext.log) resolveContext.log(file + " doesn't exist");
			return callback();
			}
			if (!stat.isFile()) {
			if (resolveContext.missingDependencies)
			resolveContext.missingDependencies.add(file);
			if (resolveContext.log) resolveContext.log(file + " is not a file");
			return callback();
			}
			if (resolveContext.fileDependencies)
			resolveContext.fileDependencies.add(file);
			resolver.doResolve(
			target,
			request,
			"existing file: " + file,
			resolveContext,
			callback
			);
			});
			});
			}
			};