No way to unsubscribe from once

[futpib]

once returns a promise and nothing else, so if you do a once and it never gets emitted it's leaked forever.

[sindresorhus]

Any suggestions on how we could solve this?

One idea is to add a special symbol to the returned promise and add a .offOnce() method to Emittery that checks for the special symbol and unsubscribes.

[futpib]

Maybe extend the returned promise with an unsubscribe or off method?

[sindresorhus]

Yeah, that may be more discoverable.