Error: 'Operator "delay" requires asynchronous pipeline'
when used inside a synchronous pipeline.
Delays each value by the specified timeout (as returned from the callback). When the timeout is a negative number, it is not added.
Note that it doesn't support return of Promise<number>
on purpose, to avoid
confusion with what operator throttle does.
Error: 'Operator "delay" requires asynchronous pipeline'
when used inside a synchronous pipeline.
Delays each value by the specified timeout. When the timeout is a negative number, no delay added.