test: Add script for performance measurements for metadata gen

scripts/_testPerformance/metadataExtendsResolver.ts

@@ -0,0 +1,32 @@
+/* eslint-disable no-console */
+import {loadApiExtract, ApiExtract} from "../../src/utils/ApiExtract.js";
+
+const main = async () => {
+	try {
+		const apiExtract = await loadApiExtract();
+
+		// Test Case 1: Check if option "backgroundColor" in "sap.m.App" exists
+		// (DON'T check borrowed ones):
+		// TODO:
+
+		// Test Case 2: Check if option "pages" in "sap.m.App" exists
+		// (check borrowed ones):
+		// TODO:
+
+		// Test Case 3: Collect all properties of "sap.m.App"
+		// (DON'T collect borrowed ones):
+		// TODO:
+
+		// Test Case 4: Collect defaultAggregation of "sap.m.App"
+		// (collect borrowed ones):
+		const defaultAggregation = apiExtract.getDefaultAggregation("sap.m.App");
+		console.log(defaultAggregation);
+
+		// TODO: add performance measurements
+	} catch (error) {
+		console.log(error);
+		process.exit(1);
+	}
+};
+
+await main();

src/utils/ApiExtract.ts

@@ -31,10 +31,37 @@ class ApiExtractImpl implements ApiExtract {
 		this.data = data;
 	}
 
-	getDefaultAggregation(className: string): string {
-		// return this.data.defaultAggregations[className];
-		// TODO: Implement this method
-		return "";
+	/**
+	 * Returns the key of a given value in a given Record.
+	 * @example _getKeyByValue({a: "b", c: "d"}, "d") // returns "c"
+	 */
+	_getKeyByValue(record: Record<string, string>, value: string): string | undefined {
+		return Object.keys(record).find((key) => record[key] === value);
+	}
+
+	// TODO: Outsource to separate function to reuse it for other options
+	// e.g. aggregation, association, event, method, property
+	getDefaultAggregation(symbolName: string): string | undefined {
+		// TODO: TEST !!!!!!!
+		let defaultAggregation: string | undefined;
+		const foundSymbolRecord = this.data.metadata[symbolName];
+		if (foundSymbolRecord) {
+			defaultAggregation = this._getKeyByValue(foundSymbolRecord, "defaultAggregation");
+			if (defaultAggregation) {
+				return defaultAggregation;
+			} else {
+				// Resolve borrowed aggregation with "extends":
+				while (foundSymbolRecord.extends) {
+					const extendsSymbolRecord = this.data.metadata[foundSymbolRecord.extends];
+					defaultAggregation = this._getKeyByValue(extendsSymbolRecord, "defaultAggregation");
+					if (defaultAggregation) {
+						return defaultAggregation;
+					}
+				}
+			}
+		}
+
+		return undefined;
 	}
 
 	getDeprecationInfo(symbolName: string): DeprecationInfo | undefined {