[FEATURE] Enable creating a CPU profile

Author: matz3

bin/ui5.js

@@ -38,7 +38,7 @@ if (
 		console.log("=====================================================================");
 	}
 	// Timeout is required to log info when importing from local installation
-	setTimeout(() => {
+	setTimeout(async () => {
 		if (!process.env.UI5_CLI_NO_LOCAL) {
 			const importLocal = require("import-local");
 			// Prefer a local installation of @ui5/cli.
@@ -57,6 +57,10 @@ if (
 			}
 		}
 
+		if (process.env.UI5_CLI_PROFILE) {
+			await (require("../lib/utils/profile").start());
+		}
+
 		const updateNotifier = require("update-notifier");
 		updateNotifier({
 			pkg,

lib/cli/commands/base.js

@@ -69,4 +69,8 @@ cli.usage("Usage: ui5 <command> [options]")
 			console.log(chalk.dim(`See 'ui5 --help' or 'ui5 build --help' for help`));
 		}
 		process.exit(1);
+	}).onFinishCommand(async () => {
+		if (process.env.UI5_CLI_PROFILE) {
+			await (require("../../utils/profile").stop());
+		}
 	});

lib/utils/profile.js

@@ -0,0 +1,31 @@
+let session;
+const profile = {
+	start() {
+		return new Promise((resolve) => {
+			if (session) {
+				resolve();
+				return;
+			}
+			const inspector = require("inspector");
+			session = new inspector.Session();
+			session.connect();
+			session.post("Profiler.enable", () => {
+				session.post("Profiler.start", () => {
+					resolve();
+				});
+			});
+		});
+	},
+	stop() {
+		if (!session) {
+			return;
+		}
+		session.post("Profiler.stop", (err, {profile}) => {
+			if (!err) {
+				require("fs").writeFileSync(`./ui5_${Date.now().toString(36)}.cpuprofile`, JSON.stringify(profile));
+			}
+		});
+	}
+};
+
+module.exports = profile;