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1 files changed, 52 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 00000000..3bcd36ce
--- /dev/null
+++ b/node_modules/enhanced-resolve/lib/MainFieldPlugin.js
@@ -0,0 +1,52 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+const path = require("path");
+
+module.exports = class MainFieldPlugin {
+	constructor(source, options, target) {
+		this.source = source;
+		this.options = options;
+		this.target = target;
+	}
+
+	apply(resolver) {
+		const target = resolver.ensureHook(this.target);
+		resolver.getHook(this.source).tapAsync("MainFieldPlugin", (request, resolveContext, callback) => {
+			if(request.path !== request.descriptionFileRoot) return callback();
+			if(request.alreadyTriedMainField === request.descriptionFilePath) return callback();
+			const content = request.descriptionFileData;
+			const filename = path.basename(request.descriptionFilePath);
+			let mainModule;
+			const field = this.options.name;
+			if(Array.isArray(field)) {
+				let current = content;
+				for(let j = 0; j < field.length; j++) {
+					if(current === null || typeof current !== "object") {
+						current = null;
+						break;
+					}
+					current = current[field[j]];
+				}
+				if(typeof current === "string") {
+					mainModule = current;
+				}
+			} else {
+				if(typeof content[field] === "string") {
+					mainModule = content[field];
+				}
+			}
+			if(!mainModule) return callback();
+			if(this.options.forceRelative && !/^\.\.?\//.test(mainModule))
+				mainModule = "./" + mainModule;
+			const obj = Object.assign({}, request, {
+				request: mainModule,
+				alreadyTriedMainField: request.descriptionFilePath
+			});
+			return resolver.doResolve(target, obj, "use " + mainModule + " from " + this.options.name + " in " + filename, resolveContext, callback);
+		});
+	}
+};