update

node_modules/enhanced-resolve/lib/FileExistsPlugin.js

@@ -0,0 +1,41 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+module.exports = class FileExistsPlugin {
+	constructor(source, target) {
+		this.source = source;
+		this.target = target;
+	}
+
+	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;
+				fs.stat(file, (err, stat) => {
+					if (err || !stat) {
+						if (resolveContext.missing) resolveContext.missing.add(file);
+						if (resolveContext.log) resolveContext.log(file + " doesn't exist");
+						return callback();
+					}
+					if (!stat.isFile()) {
+						if (resolveContext.missing) resolveContext.missing.add(file);
+						if (resolveContext.log) resolveContext.log(file + " is not a file");
+						return callback();
+					}
+					resolver.doResolve(
+						target,
+						request,
+						"existing file: " + file,
+						resolveContext,
+						callback
+					);
+				});
+			});
+	}
+};