Type Alias StreamChunk

StreamChunk:
    | { text: string; type: "text" }
    | { signature?: string; text: string; type: "thinking" }
    | { toolCall: ToolCall; type: "tool_call" }
    | { result: PromptResult; type: "done" }
    | { error: string; type: "error" }
    | { error: string; type: "timeout" }