perf: cache new URL evaluate expression (webpack#19557)

Author: alexander-akait

lib/url/URLExpressionParserPlugin.js

@@ -55,21 +55,39 @@ const isMetaUrl = (parser, arg) => {
 	return true;
 };
 
+/**
+ * @type {WeakMap<NewExpressionNode, BasicEvaluatedExpression | undefined>}
+ */
+const getEvaluatedExprCache = new WeakMap();
+
 /**
  * @param {NewExpressionNode} expr expression
  * @param {Parser} parser parser parser
- * @returns {BasicEvaluatedExpression | undefined} basicEvaluatedExpression
+ * @returns {BasicEvaluatedExpression | undefined} basic evaluated expression
  */
 const getEvaluatedExpr = (expr, parser) => {
-	if (expr.arguments.length !== 2) return;
+	let result = getEvaluatedExprCache.get(expr);
+	if (result !== undefined) return result;
+
+	/**
+	 * @returns {BasicEvaluatedExpression | undefined} basic evaluated expression
+	 */
+	const evaluate = () => {
+		if (expr.arguments.length !== 2) return;
+
+		const [arg1, arg2] = expr.arguments;
 
-	const [arg1, arg2] = expr.arguments;
+		if (arg2.type !== "MemberExpression" || arg1.type === "SpreadElement")
+			return;
+		if (!isMetaUrl(parser, arg2)) return;
 
-	if (arg2.type !== "MemberExpression" || arg1.type === "SpreadElement") return;
+		return parser.evaluateExpression(arg1);
+	};
 
-	if (!isMetaUrl(parser, arg2)) return;
+	result = evaluate();
+	getEvaluatedExprCache.set(expr, result);
 
-	return parser.evaluateExpression(arg1);
+	return result;
 };
 
 class URLParserPlugin {