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Malte UblandClaude Opus 5.5
20f15f89fd
A JavaScript function specialized per call site takes its declared
return type from JSDoc. bcryptjs's `hash` and `compare` document
`@returns {!Promise}` but return nothing when a callback is passed, so
their instances ended with the "the checker proved every path returns"
trap and every callback-style call aborted with SC9002. Non-generic
JavaScript functions already widen such a return with an undefined arm;
implicit instances now do the same.
The widened `Promise<unknown> | undefined` result is then awaited by
TypeScript callers, which was refused: an await of a promise-of-dynamic
or unit union now goes through the dynamic await, which adopts the
promise or hops once for the unit, as Node does.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>