log error as warn

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

@@ -142,7 +142,7 @@ export function hydrate(component, options) {
 		}
 		if (error !== HYDRATION_ERROR) {
 			// eslint-disable-next-line no-console
-			console.error('Failed to hydrate: ', error);
+			console.warn('Failed to hydrate: ', error);
 		}
 
 		if (options.recover === false) {

packages/svelte/tests/hydration/samples/whitespace-at-block-start/_config.js

@@ -1,21 +1,8 @@
 import { test } from '../../test';
 
-/** @type {string[]} */
-let logs = [];
-/** @type {typeof console['error']} */
-let console_error;
-
 export default test({
-	before_test() {
+	errors: [
-		console_error = console.error;
+		'Failed to hydrate: ',
-		console.error = (...args) => logs.push(args.join(''));
+		new DOMException("Node can't be inserted in a #text parent.", 'HierarchyRequestError')
-	},
+	]
-	after_test() {
-		console.error = console_error;
-	},
-	test({ deepEqual }) {
-		deepEqual(logs, [
-			"Failed to hydrate: HierarchyRequestError: Node can't be inserted in a #text parent."
-		]);
-	}
 });