Import
import { mapKeys } from "@typed/fx/RefRecord";Signatures
export declare const mapKeys: {
<K extends string, K2 extends string>(f: (key: K) => K2): <V, E, R>(ref: RefRecord<K, V, E, R>) => RefSubject.Computed<Record.ReadonlyRecord<K2, V>, E, R>;
<K extends string, V, E, R, K2 extends string>(ref: RefRecord<K, V, E, R>, f: (key: K) => K2): RefSubject.Computed<Record.ReadonlyRecord<K2, V>, E, R>;
};Why
Projects record state with map keys for both current reads and future pushes, avoiding a second mutable cache of the derived value.
Ownership and lifetime
The map keys 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.