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app_vue/node_modules/enhanced-resolve/lib/AliasFieldPlugin.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const DescriptionFileUtils = require("./DescriptionFileUtils");
+const getInnerRequest = require("./getInnerRequest");
+
+/** @typedef {import("./Resolver")} Resolver */
+/** @typedef {import("./Resolver").JsonPrimitive} JsonPrimitive */
+/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
+/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
+
+module.exports = class AliasFieldPlugin {
+	/**
+	 * @param {string | ResolveStepHook} source source
+	 * @param {string | Array<string>} field field
+	 * @param {string | ResolveStepHook} target target
+	 */
+	constructor(source, field, target) {
+		this.source = source;
+		this.field = field;
+		this.target = target;
+	}
+
+	/**
+	 * @param {Resolver} resolver the resolver
+	 * @returns {void}
+	 */
+	apply(resolver) {
+		const target = resolver.ensureHook(this.target);
+		resolver
+			.getHook(this.source)
+			.tapAsync("AliasFieldPlugin", (request, resolveContext, callback) => {
+				if (!request.descriptionFileData) return callback();
+				const innerRequest = getInnerRequest(resolver, request);
+				if (!innerRequest) return callback();
+				const fieldData = DescriptionFileUtils.getField(
+					request.descriptionFileData,
+					this.field
+				);
+				if (fieldData === null || typeof fieldData !== "object") {
+					if (resolveContext.log)
+						resolveContext.log(
+							"Field '" +
+								this.field +
+								"' doesn't contain a valid alias configuration"
+						);
+					return callback();
+				}
+				/** @type {JsonPrimitive | undefined} */
+				const data = Object.prototype.hasOwnProperty.call(
+					fieldData,
+					innerRequest
+				)
+					? /** @type {{[Key in string]: JsonPrimitive}} */ (fieldData)[
+							innerRequest
+					  ]
+					: innerRequest.startsWith("./")
+					? /** @type {{[Key in string]: JsonPrimitive}} */ (fieldData)[
+							innerRequest.slice(2)
+					  ]
+					: undefined;
+				if (data === innerRequest) return callback();
+				if (data === undefined) return callback();
+				if (data === false) {
+					/** @type {ResolveRequest} */
+					const ignoreObj = {
+						...request,
+						path: false
+					};
+					if (typeof resolveContext.yield === "function") {
+						resolveContext.yield(ignoreObj);
+						return callback(null, null);
+					}
+					return callback(null, ignoreObj);
+				}
+				/** @type {ResolveRequest} */
+				const obj = {
+					...request,
+					path: /** @type {string} */ (request.descriptionFileRoot),
+					request: /** @type {string} */ (data),
+					fullySpecified: false
+				};
+				resolver.doResolve(
+					target,
+					obj,
+					"aliased from description file " +
+						request.descriptionFilePath +
+						" with mapping '" +
+						innerRequest +
+						"' to '" +
+						/** @type {string} */ (data) +
+						"'",
+					resolveContext,
+					(err, result) => {
+						if (err) return callback(err);
+
+						// Don't allow other aliasing or raw request
+						if (result === undefined) return callback(null, null);
+						callback(null, result);
+					}
+				);
+			});
+	}
+};