fix: allow second argument to be `undefined`

fix: update types for ignored option

chore: run npm audit fix

fix: remove jsdoc types and improve internal types

Removes `fsevents` from the current documentation and the JSDoc/types.

Updates the `close` method to always return a `Promise` rather than
having a mixed return type.

We do not need to check `closed` since we only care if the close
logic/promise has already started, so switching the condition should be
enough.

fix: remove fsevents from docs and JSDoc

* improve internal types a little bit

* more type improvements

* improve map and set types

* fmt

* type timeouts

* improve `setFsWatchFileListener` arg types