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1 files changed, 81 insertions, 0 deletions

diff --git a/node_modules/enhanced-resolve/lib/MainFieldPlugin.js b/node_modules/enhanced-resolve/lib/MainFieldPlugin.js
new file mode 100644
index 0000000..5534618
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+++ b/node_modules/enhanced-resolve/lib/MainFieldPlugin.js
@@ -0,0 +1,81 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const path = require("path");
+const DescriptionFileUtils = require("./DescriptionFileUtils");
+
+/** @typedef {import("./Resolver")} Resolver */
+/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
+/** @typedef {{name: string|Array<string>, forceRelative: boolean}} MainFieldOptions */
+
+const alreadyTriedMainField = Symbol("alreadyTriedMainField");
+
+module.exports = class MainFieldPlugin {
+	/**
+	 * @param {string | ResolveStepHook} source source
+	 * @param {MainFieldOptions} options options
+	 * @param {string | ResolveStepHook} target target
+	 */
+	constructor(source, options, target) {
+		this.source = source;
+		this.options = options;
+		this.target = target;
+	}
+
+	/**
+	 * @param {Resolver} resolver the resolver
+	 * @returns {void}
+	 */
+	apply(resolver) {
+		const target = resolver.ensureHook(this.target);
+		resolver
+			.getHook(this.source)
+			.tapAsync("MainFieldPlugin", (request, resolveContext, callback) => {
+				if (
+					request.path !== request.descriptionFileRoot ||
+					request[alreadyTriedMainField] === request.descriptionFilePath ||
+					!request.descriptionFilePath
+				)
+					return callback();
+				const filename = path.basename(request.descriptionFilePath);
+				let mainModule = DescriptionFileUtils.getField(
+					request.descriptionFileData,
+					this.options.name
+				);
+
+				if (
+					!mainModule ||
+					typeof mainModule !== "string" ||
+					mainModule === "." ||
+					mainModule === "./"
+				) {
+					return callback();
+				}
+				if (this.options.forceRelative && !/^\.\.?\//.test(mainModule))
+					mainModule = "./" + mainModule;
+				const obj = {
+					...request,
+					request: mainModule,
+					module: false,
+					directory: mainModule.endsWith("/"),
+					[alreadyTriedMainField]: request.descriptionFilePath
+				};
+				return resolver.doResolve(
+					target,
+					obj,
+					"use " +
+						mainModule +
+						" from " +
+						this.options.name +
+						" in " +
+						filename,
+					resolveContext,
+					callback
+				);
+			});
+	}
+};