Initial commit

1 files changed, 149 insertions, 0 deletions

diff --git a/node_modules/enhanced-resolve/lib/ExportsFieldPlugin.js b/node_modules/enhanced-resolve/lib/ExportsFieldPlugin.js
new file mode 100644
index 0000000..2730753
--- /dev/null
+++ b/node_modules/enhanced-resolve/lib/ExportsFieldPlugin.js
@@ -0,0 +1,149 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Ivan Kopeykin @vankop
+*/
+
+"use strict";
+
+const path = require("path");
+const DescriptionFileUtils = require("./DescriptionFileUtils");
+const forEachBail = require("./forEachBail");
+const { processExportsField } = require("./util/entrypoints");
+const { parseIdentifier } = require("./util/identifier");
+const { checkExportsFieldTarget } = require("./util/path");
+
+/** @typedef {import("./Resolver")} Resolver */
+/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
+/** @typedef {import("./util/entrypoints").ExportsField} ExportsField */
+/** @typedef {import("./util/entrypoints").FieldProcessor} FieldProcessor */
+
+module.exports = class ExportsFieldPlugin {
+	/**
+	 * @param {string | ResolveStepHook} source source
+	 * @param {Set<string>} conditionNames condition names
+	 * @param {string | string[]} fieldNamePath name path
+	 * @param {string | ResolveStepHook} target target
+	 */
+	constructor(source, conditionNames, fieldNamePath, target) {
+		this.source = source;
+		this.target = target;
+		this.conditionNames = conditionNames;
+		this.fieldName = fieldNamePath;
+		/** @type {WeakMap<any, FieldProcessor>} */
+		this.fieldProcessorCache = new WeakMap();
+	}
+
+	/**
+	 * @param {Resolver} resolver the resolver
+	 * @returns {void}
+	 */
+	apply(resolver) {
+		const target = resolver.ensureHook(this.target);
+		resolver
+			.getHook(this.source)
+			.tapAsync("ExportsFieldPlugin", (request, resolveContext, callback) => {
+				// When there is no description file, abort
+				if (!request.descriptionFilePath) return callback();
+				if (
+					// When the description file is inherited from parent, abort
+					// (There is no description file inside of this package)
+					request.relativePath !== "." ||
+					request.request === undefined
+				)
+					return callback();
+
+				const remainingRequest =
+					request.query || request.fragment
+						? (request.request === "." ? "./" : request.request) +
+						  request.query +
+						  request.fragment
+						: request.request;
+				/** @type {ExportsField|null} */
+				const exportsField = DescriptionFileUtils.getField(
+					request.descriptionFileData,
+					this.fieldName
+				);
+				if (!exportsField) return callback();
+
+				if (request.directory) {
+					return callback(
+						new Error(
+							`Resolving to directories is not possible with the exports field (request was ${remainingRequest}/)`
+						)
+					);
+				}
+
+				let paths;
+
+				try {
+					// We attach the cache to the description file instead of the exportsField value
+					// because we use a WeakMap and the exportsField could be a string too.
+					// Description file is always an object when exports field can be accessed.
+					let fieldProcessor = this.fieldProcessorCache.get(
+						request.descriptionFileData
+					);
+					if (fieldProcessor === undefined) {
+						fieldProcessor = processExportsField(exportsField);
+						this.fieldProcessorCache.set(
+							request.descriptionFileData,
+							fieldProcessor
+						);
+					}
+					paths = fieldProcessor(remainingRequest, this.conditionNames);
+				} catch (err) {
+					if (resolveContext.log) {
+						resolveContext.log(
+							`Exports field in ${request.descriptionFilePath} can't be processed: ${err}`
+						);
+					}
+					return callback(err);
+				}
+
+				if (paths.length === 0) {
+					return callback(
+						new Error(
+							`Package path ${remainingRequest} is not exported from package ${request.descriptionFileRoot} (see exports field in ${request.descriptionFilePath})`
+						)
+					);
+				}
+
+				forEachBail(
+					paths,
+					(p, callback) => {
+						const parsedIdentifier = parseIdentifier(p);
+
+						if (!parsedIdentifier) return callback();
+
+						const [relativePath, query, fragment] = parsedIdentifier;
+
+						const error = checkExportsFieldTarget(relativePath);
+
+						if (error) {
+							return callback(error);
+						}
+
+						const obj = {
+							...request,
+							request: undefined,
+							path: path.join(
+								/** @type {string} */ (request.descriptionFileRoot),
+								relativePath
+							),
+							relativePath,
+							query,
+							fragment
+						};
+
+						resolver.doResolve(
+							target,
+							obj,
+							"using exports field: " + p,
+							resolveContext,
+							callback
+						);
+					},
+					(err, result) => callback(err, result || null)
+				);
+			});
+	}
+};