feat: add universal IDs to client nodes

Author: elliott-with-the-longest-name-on-github

packages/kit/src/core/sync/write_client_manifest.js

@@ -29,6 +29,11 @@ export function write_client_manifest(kit, manifest_data, output, metadata) {
 			);
 		}
 
+		if (kit.tracing === 'client' || kit.tracing === true) {
+			// we don't need to include these if tracing is disabled -- they make the manifest bigger
+			declarations.push(`export const universal_id = ${s(node.universal)};`);
+		}
+
 		if (node.component) {
 			declarations.push(
 				`export { default as component } from ${s(

packages/kit/src/types/internal.d.ts

@@ -111,6 +111,7 @@ export interface CSRPageNode {
 		load?: Load;
 		trailingSlash?: TrailingSlash;
 	};
+	universal_id?: string;
 }
 
 export type CSRPageNodeLoader = () => Promise<CSRPageNode>;