File size: 1,569 Bytes
bc20498 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 |
import { Invalidator } from './private.js';
/** Callback to inform of a value updates. */
export type Subscriber<T> = (value: T) => void;
/** Unsubscribes from value updates. */
export type Unsubscriber = () => void;
/** Callback to update a value. */
export type Updater<T> = (value: T) => T;
/**
* Start and stop notification callbacks.
* This function is called when the first subscriber subscribes.
*
* @param {(value: T) => void} set Function that sets the value of the store.
* @param {(value: Updater<T>) => void} update Function that sets the value of the store after passing the current value to the update function.
* @returns {void | (() => void)} Optionally, a cleanup function that is called when the last remaining
* subscriber unsubscribes.
*/
export 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;
}
export * from './index.js';
|