StreamEvent - Photon

Duck-typed stream event compatible with AI SDK’s fullStream and with AG-UI protocol streams such as TanStack AI’s chat().

text-delta (AI SDK) and TEXT_MESSAGE_CONTENT (AG-UI) events are extracted as text output.
finish-step (AI SDK) and TEXT_MESSAGE_END (AG-UI) events trigger paragraph separators between steps.
All other event types (tool calls, tool results, run lifecycle, reasoning, etc.) are silently skipped.

type StreamEvent = { textDelta: string; type: "text-delta" } | { text: string; type: "text-delta" } | { type: "finish-step" } | { delta: string; messageId: string; type: "TEXT_MESSAGE_CONTENT" } | { messageId: string; type: "TEXT_MESSAGE_END" } | { type: string }

⌘I