import type { Mutator } from './types/outputs/Mutator.js';
/**
 * Builds a {@link Mutator} object around fn. If "mutate" is called while a previous mutation is still running,
 * two cases will be handled :
 * 1. the second call uses the same `arg` => the call is deduplicated and will subscribe to the running call results.
 * 2. the second call uses another `arg` => the previous call will be canceled in favor of the new one
 *
 * @param fn
 *
 * @since 1.0.0
 */
export declare function mutable$<A, D>(fn: MutableCallback<A, D>): Mutator<A, D>;
export type MutableCallback<in A = unknown, out D = unknown> = (arg: A, signal: AbortSignal) => D;