1 files changed, 112 insertions, 0 deletions
diff --git a/node_modules/enhanced-resolve/lib/UnsafeCachePlugin.js b/node_modules/enhanced-resolve/lib/UnsafeCachePlugin.js
new file mode 100644
index 00000000..e6c01498
--- /dev/null
+++ b/node_modules/enhanced-resolve/lib/UnsafeCachePlugin.js
@@ -0,0 +1,112 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+/** @typedef {import("./Resolver")} Resolver */
+/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
+/** @typedef {import("./Resolver").ResolveStepHook} ResolveStepHook */
+/** @typedef {import("./Resolver").ResolveContextYield} ResolveContextYield */
+/** @typedef {{[k: string]: ResolveRequest | ResolveRequest[] | undefined}} Cache */
+
+/**
+ * @param {string} type type of cache
+ * @param {ResolveRequest} request request
+ * @param {boolean} withContext cache with context?
+ * @returns {string} cache id
+ */
+function getCacheId(type, request, withContext) {
+	return JSON.stringify({
+		type,
+		context: withContext ? request.context : "",
+		path: request.path,
+		query: request.query,
+		fragment: request.fragment,
+		request: request.request
+	});
+}
+
+module.exports = class UnsafeCachePlugin {
+	/**
+	 * @param {string | ResolveStepHook} source source
+	 * @param {function(ResolveRequest): boolean} filterPredicate filterPredicate
+	 * @param {Cache} cache cache
+	 * @param {boolean} withContext withContext
+	 * @param {string | ResolveStepHook} target target
+	 */
+	constructor(source, filterPredicate, cache, withContext, target) {
+		this.source = source;
+		this.filterPredicate = filterPredicate;
+		this.withContext = withContext;
+		this.cache = cache;
+		this.target = target;
+	}
+
+	/**
+	 * @param {Resolver} resolver the resolver
+	 * @returns {void}
+	 */
+	apply(resolver) {
+		const target = resolver.ensureHook(this.target);
+		resolver
+			.getHook(this.source)
+			.tapAsync("UnsafeCachePlugin", (request, resolveContext, callback) => {
+				if (!this.filterPredicate(request)) return callback();
+				const isYield = typeof resolveContext.yield === "function";
+				const cacheId = getCacheId(
+					isYield ? "yield" : "default",
+					request,
+					this.withContext
+				);
+				const cacheEntry = this.cache[cacheId];
+				if (cacheEntry) {
+					if (isYield) {
+						const yield_ = /** @type {Function} */ (resolveContext.yield);
+						if (Array.isArray(cacheEntry)) {
+							for (const result of cacheEntry) yield_(result);
+						} else {
+							yield_(cacheEntry);
+						}
+						return callback(null, null);
+					}
+					return callback(null, /** @type {ResolveRequest} */ (cacheEntry));
+				}
+
+				/** @type {ResolveContextYield|undefined} */
+				let yieldFn;
+				/** @type {ResolveContextYield|undefined} */
+				let yield_;
+				/** @type {ResolveRequest[]} */
+				const yieldResult = [];
+				if (isYield) {
+					yieldFn = resolveContext.yield;
+					yield_ = result => {
+						yieldResult.push(result);
+					};
+				}
+
+				resolver.doResolve(
+					target,
+					request,
+					null,
+					yield_ ? { ...resolveContext, yield: yield_ } : resolveContext,
+					(err, result) => {
+						if (err) return callback(err);
+						if (isYield) {
+							if (result) yieldResult.push(result);
+							for (const result of yieldResult) {
+								/** @type {ResolveContextYield} */
+								(yieldFn)(result);
+							}
+							this.cache[cacheId] = yieldResult;
+							return callback(null, null);
+						}
+						if (result) return callback(null, (this.cache[cacheId] = result));
+						callback();
+					}
+				);
+			});
+	}
+};