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node_modules/enhanced-resolve/lib/SymlinkPlugin.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const forEachBail = require("./forEachBail");
+const getPaths = require("./getPaths");
+const { getType, PathType } = require("./util/path");
+
+/** @typedef {import("./Resolver")} Resolver */
+/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
+
+module.exports = class SymlinkPlugin {
+	/**
+	 * @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("SymlinkPlugin", (request, resolveContext, callback) => {
+				if (request.ignoreSymlinks) return callback();
+				const pathsResult = getPaths(request.path);
+				const pathSegments = pathsResult.segments;
+				const paths = pathsResult.paths;
+
+				let containsSymlink = false;
+				let idx = -1;
+				forEachBail(
+					paths,
+					(path, callback) => {
+						idx++;
+						if (resolveContext.fileDependencies)
+							resolveContext.fileDependencies.add(path);
+						fs.readlink(path, (err, result) => {
+							if (!err && result) {
+								pathSegments[idx] = result;
+								containsSymlink = true;
+								// Shortcut when absolute symlink found
+								const resultType = getType(result.toString());
+								if (
+									resultType === PathType.AbsoluteWin ||
+									resultType === PathType.AbsolutePosix
+								) {
+									return callback(null, idx);
+								}
+							}
+							callback();
+						});
+					},
+					(err, idx) => {
+						if (!containsSymlink) return callback();
+						const resultSegments =
+							typeof idx === "number"
+								? pathSegments.slice(0, idx + 1)
+								: pathSegments.slice();
+						const result = resultSegments.reduceRight((a, b) => {
+							return resolver.join(a, b);
+						});
+						const obj = {
+							...request,
+							path: result
+						};
+						resolver.doResolve(
+							target,
+							obj,
+							"resolved symlink to " + result,
+							resolveContext,
+							callback
+						);
+					}
+				);
+			});
+	}
+};