import { Op } from "../op/op.js";
import { Signal } from "./signal.js";
export declare class OpSignal<V> extends Signal<Op.For<V>> {
    #private;
    constructor(op: Op.For<V>);
    load(fn: () => Promise<V>): Promise<V>;
    setLoading(): void;
    setError(reason: string): void;
    setReady(payload: V): void;
    isLoading(): this is Signal<Op.Loading>;
    isError(): this is Signal<Op.Error>;
    isReady(): this is Signal<Op.Ready<V>>;
    get payload(): (this extends Signal<Op.Ready<V>> ? V : this extends Signal<Op.Loading> ? undefined : this extends Signal<Op.Error> ? undefined : V | undefined);
    select<R>(choices: Op.Choices<V, R>): R;
}