```ts
type StreamType = "stdout" | "stderr";
```

Defined in: [src/sandbox/types.ts:11](https://github.com/strands-agents/harness-sdk/blob/f23d6cce5a8fae509dc0ad28ee20de4be886e7d9/strands-ts/src/sandbox/types.ts#L11)

Type of a streaming output chunk — distinguishes stdout from stderr.