WIP - add extractor, generate snippet_data

node_modules/enhanced-resolve/lib/UnsafeCachePlugin.js

@@ -0,0 +1,41 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+"use strict";
+
+function getCacheId(request, withContext) {
+	return JSON.stringify({
+		context: withContext ? request.context : "",
+		path: request.path,
+		query: request.query,
+		request: request.request
+	});
+}
+
+module.exports = class UnsafeCachePlugin {
+	constructor(source, filterPredicate, cache, withContext, target) {
+		this.source = source;
+		this.filterPredicate = filterPredicate;
+		this.withContext = withContext;
+		this.cache = cache || {};
+		this.target = target;
+	}
+
+	apply(resolver) {
+		const target = resolver.ensureHook(this.target);
+		resolver.getHook(this.source).tapAsync("UnsafeCachePlugin", (request, resolveContext, callback) => {
+			if(!this.filterPredicate(request)) return callback();
+			const cacheId = getCacheId(request, this.withContext);
+			const cacheEntry = this.cache[cacheId];
+			if(cacheEntry) {
+				return callback(null, cacheEntry);
+			}
+			resolver.doResolve(target, request, null, resolveContext, (err, result) => {
+				if(err) return callback(err);
+				if(result) return callback(null, this.cache[cacheId] = result);
+				callback();
+			});
+		});
+	}
+};