import { ReadableSignal } from './ReadableSignal.js';
import { Signal } from './Signal.js';
import { Subscriber } from './Subscriber.js';
export declare class Supply<T> implements ReadableSignal<T> {
    protected readonly signal: Signal<T>;
    constructor(signal: Signal<T>);
    get(): T;
    subscribe(subscriber: Subscriber<T>): () => void;
    subscribeDeferred(subscriber: Subscriber<T>): () => void;
    notify(): void;
    derive<U>(callback: (value: T) => U): Supply<U>;
}