Data returned from action inside / is not serializable: Cannot stringify arbitrary non-POJOs

[leobenkel]

Hello, I tried to copy what you are doing with the ReadableStream :

const example_stream_rows = [/* examples */]

const readable: ReadableStream = new ReadableStream<string>({
	async start(controller) {
		for (const row of example_stream_rows) {
			console.log("PUSHING", row);
			controller.enqueue(row);
		}
		console.log("CLOSING");
		controller.close();
	}
});

and

return new Response(readable, {
	headers: { 'Content-Type': 'text/plain' },
})

but I am getting:

Error: Data returned from action inside / is not serializable: Cannot stringify arbitrary non-POJOs
    at try_deserialize (/workspaces/app/node_modules/@sveltejs/kit/src/runtime/server/page/actions.js:286:10)
    at stringify_action_response (/workspaces/app/node_modules/@sveltejs/kit/src/runtime/server/page/actions.js:268:9)
    at Module.handle_action_json_request (/workspaces/app/node_modules/@sveltejs/kit/src/runtime/server/page/actions.js:71:11)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async resolve (/workspaces/app/node_modules/@sveltejs/kit/src/runtime/server/respond.js:409:18)
    at async Module.respond (/workspaces/app/node_modules/@sveltejs/kit/src/runtime/server/respond.js:282:20)
    at async file:///workspaces/app/node_modules/@sveltejs/kit/src/exports/vite/dev/index.js:502:22

Have you encountered something similar ?

[ConProgramming]

Are you returning the stream from an action? At the moment, SvelteKit only supports returning streams from server routes (+server.ts)

[leobenkel]

oh my god ! You saved my day ! Thank you so much, it now works ! 🎉