cleanup

packages/svelte/src/internal/client/runtime.js

@@ -837,7 +837,7 @@ function attach_trace(signal) {
 				// Chromium-based browsers don't do source mapping based on whether an Error object is handed to them,
 				// they purely do pattern matching on the stack trace string. This leads us to unfortunately needing to
 				// have "Error" as part of the name even if it's not really one.
-				error.stack = `ExpectedError: ($log.trace)\n${error.stack?.split('\n')?.at(3)}`;
+				error.stack = `ExpectedError: $log.trace\n${error.stack?.split('\n')?.at(3)}`;
 			} else {
 				// For once, Safari and Firefox do it better
 				error.name = '$log.trace';

packages/svelte/src/internal/client/types.d.ts

@@ -82,7 +82,7 @@ export type SourceSignal<V = unknown> = {
 
 export type SourceSignalDebug = {
 	/** debug: This is DEV only */
-	d: null | string;
+	d: null | Error;
 };
 
 export type ComputationSignal<V = unknown> = {

packages/svelte/tests/runtime-runes/samples/log-trace/_config.js

@@ -23,14 +23,18 @@ export default test({
 	after_test() {
 		console.log = original_log;
 	},
-	async test({ assert, target, component }) {
+	async test({ assert, target }) {
 		const [b1, b2] = target.querySelectorAll('button');
 		b1.click();
 		b2.click();
 		await Promise.resolve();
 
 		assert.deepEqual(log[0], 0);
-		assert.deepEqual(log[1].startsWith('$log.trace: HTMLButtonElement.on_click'), true);
+		assert.deepEqual(
+			log[1].stack.startsWith('ExpectedError: $log.trace') &&
+				log[1].stack.includes('HTMLButtonElement.on_click'),
+			true
+		);
 		assert.deepEqual(log[2], 1);
 	}
 });