StructuredOutputStartEvent

Defined in: packages/ai/src/types.ts:1792

Emitted at the start of a streaming structured-output run, before the JSON deltas. Tells consumers that the upcoming TEXT_MESSAGE_CONTENT deltas belong to a structured response so they can route those bytes into a StructuredOutputPart instead of building a TextPart. Carries the messageId the deltas will be tagged with so the routing decision can be made per-message rather than globally.

Extends#

• CustomEvent

Properties#

metadata?#

optional metadata?: Record<string, any>;

Defined in: packages/ai/src/types.ts:1756

Extra information attached to this event.

Inherited from#

CustomEvent.metadata

name#

name: "structured-output.start";

Defined in: packages/ai/src/types.ts:1793

What this custom event is. Required: without it a consumer cannot route the value.

Overrides#

CustomEvent.name

type#

type: "CUSTOM";

Defined in: packages/ai/src/types.ts:1755

Inherited from#

CustomEvent.type

value#

value: object;

Defined in: packages/ai/src/types.ts:1794

The payload. Any JSON value, and required.

messageId#

messageId: string;

Overrides#

CustomEvent.value