Function withRequestContextStream

withRequestContextStream<TInput, TOutput>(
req: AIRequest<TInput>,
fn: (req: AIRequest<TInput>) => AsyncGenerator<AIResponseChunk<TOutput>>,
): AsyncGenerator<AIResponseChunk<TOutput>>
Wraps a streaming async provider call (AsyncIterable) with request-scoped context metadata.

This helper:
- Generates a unique requestId
- Captures start time
- Injects request context into the AIRequest
- Attaches timing and request metadata to each streamed chunk
Designed for streaming chat, image generation, or any provider API that emits incremental results.
Type Parameters
- TInput
  The input payload type sent to the provider
- TOutput
  The output payload type for each streamed chunk
Parameters
- req: AIRequest<TInput>
  Unified AI request containing input, options, and optional context
- fn: (req: AIRequest<TInput>) => AsyncGenerator<AIResponseChunk<TOutput>>
  Provider streaming execution function to wrap
Returns AsyncGenerator<AIResponseChunk<TOutput>>
An AsyncGenerator emitting AIResponseChunk objects with metadata attached
- Defined in src/core/utils/WithRequestContext.ts:72