Diffusion Ant (master) Code

ant/tests/test_stream_transform_async_callback.cjs
201d063fe28amaster

test_stream_transform_async_callback.cjs
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			const { Transform } = require('node:stream');

			async function main() {
			let output = '';

			const tr = new Transform({
			transform(chunk, encoding, cb) {
			Promise.resolve().then(() => {
			cb(null, chunk.toString('utf8').toUpperCase());
			});
			},
			});

			tr.on('data', (chunk) => {
			output += chunk.toString('utf8');
			});

			const finished = new Promise((resolve, reject) => {
			tr.on('finish', resolve);
			tr.on('error', reject);
			});

			tr.write('abc');
			tr.end();
			await finished;

			if (output !== 'ABC') {
			throw new Error(`expected "ABC", got ${JSON.stringify(output)}`);
			}

			console.log('stream Transform async callback preserves receiver state');
			}

			main().catch((err) => {
			console.error(err && err.stack ? err.stack : String(err));
			process.exit(1);
			});

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