feat(core): Add traceLifecycle option and beforeSendSpan compatibility utilities
#19120
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Adds support for span streaming configuration:
- Add `traceLifecycle` option to ClientOptions ('static' | 'stream')
- Add `BeforeSendSpanCallback` type with optional `_streamed` marker
- Add `withStreamedSpan()` utility to wrap callbacks for streamed spans
- Add `isStreamedBeforeSendSpanCallback()` type guard utility
This is part of the span streaming feature that allows spans to be sent
incrementally rather than waiting for the full trace to complete.
Co-authored-by: Cursor <cursoragent@cursor.com>
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Lms24
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traceLifecycle option and beforeSendSpan compatibility utilities
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s1gr1d
reviewed
Feb 3, 2026
| * When true, indicates this callback is designed to handle the {@link StreamedSpanJSON} format | ||
| * used with `traceLifecycle: 'stream'`. Set this by wrapping your callback with `withStreamedSpan`. | ||
| */ | ||
| _streamed?: true; |
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M: As only true is allowed here, we might need to set this type to true | undefined in case someone enabled exactOptionalPropertyTypes.
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Summary
This PR adds the foundation for span streaming configuration:
traceLifecycleoption: New option inClientOptionsthat controls whether spans are sent statically (when the entire local span tree is complete) or streamed (in batches following interval- and action-based triggers).Because the span JSON will look different for streamed spans vs. static spans (i.e. our current ones, we also need some helpers for
beforeSendSpanwhere users consume and interact withStreamedSpanJSON:withStreamedSpan()utility: Wrapper function that marks abeforeSendSpancallback as compatible with the streamed span format (StreamedSpanJSON)isStreamedBeforeSendSpanCallback()type guard: Internal utility to check if a callback was wrapped withwithStreamedSpanUsage Example
ref #17836