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

Defined in: [src/sandbox/types.ts:11](https://github.com/strands-agents/harness-sdk/blob/57d070582e9bd93afb549b4d2f976ce0dbaf03b6/strands-ts/src/sandbox/types.ts#L11)

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