todo_rsc_form_action_markup.mjs
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todo_rsc_form_action_markup.mjs
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	function assert(cond, msg) {
	if (!cond) throw new Error(msg);
	}

	async function readUntil(response, marker, limit = 32768) {
	const stream = response.body;
	assert(stream, 'expected response body stream');

	const reader = stream.getReader();
	const decoder = new TextDecoder();
	let text = '';

	while (text.length < limit) {
	const chunk = await reader.read();
	if (chunk.done) break;
	text += decoder.decode(chunk.value, { stream: true });
	if (text.includes(marker)) break;
	}

	text += decoder.decode();
	return text;
	}

	const mod = await import('../todo/rsc/dist/rsc/index.js');
	const handler = mod.default;

	assert(handler && typeof handler.fetch === 'function', 'expected todo/rsc handler.fetch');

	const response = await handler.fetch(new Request('http://localhost/'));
	assert(response.status === 200, `expected status 200, got ${response.status}`);

	const html = await readUntil(response, '</form>');
	const formStart = html.indexOf('<form');
	assert(formStart !== -1, 'expected rendered form');

	const formEnd = html.indexOf('</form>', formStart);
	assert(formEnd !== -1, 'expected form closing tag');

	const snippet = html.slice(formStart, formEnd + 7);
	console.log(snippet);

	assert(
	snippet.includes('$ACTION_') \|\|
	snippet.includes('javascript:throw new Error') \|\|
	snippet.includes('formAction'),
	'expected server action metadata or replay marker in form markup',
	);

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