/** Cleanup logic callback. */
type Invalidator<T> = (value?: T) => void;
/** Callback to inform of a value updates. */
type Subscriber<T> = (value: T) => void;
/** Unsubscribes from value updates. */
type Unsubscriber = () => void;
/** Callback to update a value. */
type Updater<T> = (value: T) => T;
/**
 * Start and stop notification callbacks.
 * This function is called when the first subscriber subscribes.
 *
 * @param set - Function that sets the value of the store.
 * @param update - Function that sets the value of the store after passing thecurrent value to the
 * update function.
 * @returns Optionally, a cleanup function that is called when the last remaining subscriber
 * unsubscribes.
 */
type StartStopNotifier<T> = (set: (value: T) => void, update: (fn: Updater<T>) => void) => void | (() => void);
/** Readable interface for subscribing. */
export interface Readable<T> {
    /**
     * Subscribe on value changes.
     * @param run subscription callback
     * @param invalidate cleanup callback
     */
    subscribe(this: void, run: Subscriber<T>, invalidate?: Invalidator<T>): Unsubscriber;
}
/** Writable interface for both updating and subscribing. */
export interface Writable<T> extends Readable<T> {
    /**
     * Set value and inform subscribers.
     * @param value to set
     */
    set(this: void, value: T): void;
    /**
     * Update value using callback and inform subscribers.
     * @param updater callback
     */
    update(this: void, updater: Updater<T>): void;
}
/**
 * Creates a `Readable` store that allows reading by subscription.
 *
 * https://svelte.dev/docs/svelte-store#readable
 */
export declare function readable<T>(value: T, start: StartStopNotifier<T>): Readable<T>;
/**
 * Create a `Writable` store that allows both updating and reading by subscription.
 *
 * https://svelte.dev/docs/svelte-store#writable
 * @param value - initial value
 */
export declare function writable<T>(value: T, start?: StartStopNotifier<T>): Writable<T>;
/**
 * Get the current value from a store by subscribing and immediately unsubscribing.
 *
 * https://svelte.dev/docs/svelte-store#get
 * @template T
 * @param {Readable<T>} store
 * @returns {T}
 */
export declare function get<T>(store: Readable<T>): T;
export {};