* Convert a Node.js Readable stream to the new Stream API. * * Features: * - Proper backpressure handling * - Error propagation from Node.js stream to new Stream * - Cleanup on cancel (destroys the Node.js stream)
(readable: Readable)
| 31 | * - Cleanup on cancel (destroys the Node.js stream) |
| 32 | */ |
| 33 | function fromNodeReadable(readable: Readable) { |
| 34 | return Stream.from( |
| 35 | (async function* () { |
| 36 | // Track if we need to destroy the readable on cleanup |
| 37 | const destroyed = false; |
| 38 | |
| 39 | try { |
| 40 | // Use async iteration (Node.js 10+) |
| 41 | for await (const chunk of readable) { |
| 42 | // Node.js streams can emit strings or Buffers |
| 43 | if (typeof chunk === 'string') { |
| 44 | yield chunk; |
| 45 | } else if (Buffer.isBuffer(chunk)) { |
| 46 | // Convert Buffer to Uint8Array (zero-copy view) |
| 47 | yield new Uint8Array(chunk.buffer, chunk.byteOffset, chunk.byteLength); |
| 48 | } else if (chunk instanceof Uint8Array) { |
| 49 | yield chunk; |
| 50 | } else { |
| 51 | throw new Error(`Unexpected chunk type: ${typeof chunk}`); |
| 52 | } |
| 53 | } |
| 54 | } finally { |
| 55 | // Cleanup: destroy the readable if not already destroyed |
| 56 | if (!destroyed && !readable.destroyed) { |
| 57 | readable.destroy(); |
| 58 | } |
| 59 | } |
| 60 | })() |
| 61 | ); |
| 62 | } |
| 63 | |
| 64 | // ============================================================================ |
| 65 | // Adapter: Create Writer that writes to Node.js Writable |