Import
import { isNone } from "@typed/fx/RefOption";Signatures
export declare const isNone: <A, E, R>(ref: RefOption<A, E, R>) => RefSubject.Computed<boolean, E, R>;Why
Exposes whether the current Option is None as Computed state, without caching a second boolean beside the source Option.
Ownership and lifetime
The is none view retains no independent state. An Effect read samples the source once; Fx observation follows later pushes and its observing Scope owns subscription cleanup.
Other public imports
These import paths expose the same declaration. Each page retains its own public name and signature.