PSR for async libraries

[Italo Baeza Cabrera]

Hi.

Following the auge of async libraries and introduction of Fiber at the end of the year, its very weird no PSR regarding async implementation has been actively discussed.

In my humble opinion, a PSR-21 for async libraries, specifically the Event Loop and Promises, would allow async libraries interoperability regardless of how these handle the asynchronous execution internally themselves. For example, a library asking for PSR-21 would allow the project using that library to swap Amp, ReactPHP, Swoole, or anything else.

Using the same Event Loop, packages would not conflict over the Loop execution, while a common Promise interface wouldn't lock the API inside async contexts.