Type Alias Carrier<T>

Carrier: T extends object
? T & { baggage?: string; traceparent?: string; tracestate?: string }
: T

Type helper that adds W3C trace propagation fields to an object type.

If T extends object, the result is T & { traceparent: string; tracestate?: string; baggage?: string }.
Otherwise, T is returned as-is.

Useful for typing workflow params or message payloads that carry trace context.

Type Parameters

T

Example

interface MyParams { userId: string }

// { userId: string; traceparent: string; tracestate?: string; baggage?: string }
type MyCarrier = Carrier<MyParams>;

// Non-object types pass through unchanged
type Str = Carrier<string>; // string