How do using declarations simplify Node.js resource cleanup?

using automatically closes streams, database connections, and crypto keys even if promises reject. Eliminates try/finally boilerplate across entire codebase. Nested scopes handle complex async patterns correctly. Guaranteed disposal regardless of execution path.

Example:-

Code

using db = await pg.connect(connectionString);
using stream = fs.createReadStream('large.file');
for await (const chunk of stream) {
  await db.query(chunk); // Auto cleanup guaranteed
}