xatto/dist/src/Observable.d.ts

xatto is View Layer Library based on Function and Context using VirtualDOM. This is developed by forking from jorgebucaran/superfine.

import { Subscription } from './Subscription';
export interface Observable<T> {
    subscribe: (next: (value: T) => void, fail?: (err: Error) => void, comp?: () => void) => Subscription;
}