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

Defined in: [src/sandbox/types.ts:11](https://github.com/strands-agents/harness-sdk/blob/14f0b3355dd082f937ecaea538a370cab71ad4f8/strands-ts/src/sandbox/types.ts#L11)

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