fix: regression when serializing server data (#13709)

* fix: regression when serializing server data

* fix

---------

Co-authored-by: Rich Harris <[email protected]>

Author: Conduitry

.changeset/chilly-dancers-deliver.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: regression when serializing server data

packages/kit/src/runtime/server/data/index.js

@@ -253,7 +253,7 @@ export function get_data_json(event, options, nodes) {
 				return JSON.stringify(node);
 			}
 
-			return `{"type":"data","data":${devalue.stringify(node.data, reducers)},${JSON.stringify(
+			return `{"type":"data","data":${devalue.stringify(node.data, reducers)},"uses":${JSON.stringify(
 				serialize_uses(node)
 			)}${node.slash ? `,"slash":${JSON.stringify(node.slash)}` : ''}}`;
 		});
@@ -263,6 +263,8 @@ export function get_data_json(event, options, nodes) {
 			chunks: count > 0 ? iterator : null
 		};
 	} catch (e) {
+		// @ts-expect-error
+		e.path = 'data' + e.path;
 		throw new Error(clarify_devalue_error(event, /** @type {any} */ (e)));
 	}
 }

packages/kit/src/runtime/server/page/render.js

@@ -658,6 +658,8 @@ function get_data(event, options, nodes, csp, global) {
 			chunks: count > 0 ? iterator : null
 		};
 	} catch (e) {
+		// @ts-expect-error
+		e.path = e.path.slice(1);
 		throw new Error(clarify_devalue_error(event, /** @type {any} */ (e)));
 	}
 }

packages/kit/src/runtime/server/utils.js

@@ -133,7 +133,7 @@ export function redirect_response(status, location) {
  */
 export function clarify_devalue_error(event, error) {
 	if (error.path) {
-		return `Data returned from \`load\` while rendering ${event.route.id} is not serializable: ${error.message} (data${error.path})`;
+		return `Data returned from \`load\` while rendering ${event.route.id} is not serializable: ${error.message} (${error.path})`;
 	}
 
 	if (error.path === '') {