Function until

until<T>(source: UntilMethod<T> | Stream<T> | (() => T)): Yielding<T>
Wait for and return the next truthy value (or error) from a data source (when processed with yield * within a Job).

This differs from next() in that it waits for the next "truthy" value (i.e., not null, false, zero, empty string, etc.), and when used with signals or a signal-using function, it can resume immediately if the result is already truthy. (It also supports zero-argument signal-using functions, automatically wrapping them with cached(), as the common use case for until() is to wait for an arbitrary condition to be satisfied.)
Type Parameters
- T
Parameters
- source: UntilMethod<T> | Stream<T> | (() => T)
  The source to wait on, which can be:
  - An object with an "uneventful.until" method returning a Yielding (in which case the result will be the the result of calling that method)
  - A Signal, or a zero-argument function returning a value based on signals (in which case the job resumes as soon as the result is truthy, perhaps immediately)
  - A Source (in which case the job resumes on the next truthy value it produces
  (Note: if the supplied source is a function with a non-zero .length, it is assumed to be a Source.)
Returns Yielding<T>
a Yieldable that when processed with yield * in a job, will return the triggered event, or signal value. An error is thrown if event stream throws or closes early, or the signal throws.
- Defined in src/signals.ts:343