mirror: Blazing fast w3c Trace Contexts for any JS runtime
chore: whoops docblock comments broken
Marais Rossouw
(Jun 26, 2026, 1:15 PM +1000)
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lib/tracestate.ts
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lib/tracestate.ts
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* A simple implementation of the {@link https://www.w3.org/TR/trace-context-2/|W3C Trace Context specification level 2}.
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*
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* This module provides a simple API for creating, parsing, and manipulating tracestate headers. You will probably also
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* be relying on the {@link {import('./traceparent.ts')}} module to create and parse traceparent headers.
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* be relying on the {@link import('./traceparent.ts')} module to create and parse traceparent headers.
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*
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* Tracestates are effectivly a ring buffer of 32 key-value pairs, where the key is a string of up to 256 characters and
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* the value is a string of up to 256 characters. The key must be unique within the tracestate.
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*
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* Updateing the tracestate is done by calling the {@link {Tracestate.set}} method, which will update the value of the
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* Updateing the tracestate is done by calling the {@link Tracestate.set} method, which will update the value of the
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* key if it exists (and move it to the front), or prepend a new key-value pair to the front of the tracestate. If the
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* tracestate is full, the oldest key-value pair will be removed.
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*
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* let traceparent, tracestate, tmp;
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* tmp = req.headers.get('traceparent');
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* if (tmp) traceparent = ts.parse(tmp);
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*
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* tmp = req.headers.get('tracestate');
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* // only parse the tracestate, if we have a valid parsed traceparent, as per spec
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* if (traceparent && tmp) tracestate = ts.parse(tmp);