Package Exports
- evnty
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Readme
Evnty
0-Deps, simple, fast, for browser and node js anonymous event library
Interface
declare type Unsubscribe = () => void;
declare type Listener = (...args: any[]) => void;
declare type Dispose = () => void;
declare type Filter = (...args: any[]) => boolean;
declare type Mapper = <T = any>(...args: any[]) => T;
declare type Reducer = <T = any>(value: any, ...args: any[]) => T;
declare class Event {
static merge(...events: Event[]): Event;
static interval(interval: number): Event;
readonly size: Number;
constructor(dispose?: Dispose);
has(listener: Listener): boolean;
off(listener: Listener): void;
on(listener: Listener): Unsubscribe;
once(listener: Listener): Unsubscribe;
clear(): void;
toPromise(): Promise<any[]>;
filter(filter: Filter): Event;
map(mapper: Mapper): Event;
reduce(reducer: Reducer, init: any): Event;
}Usage
import event from 'evnty';
function handleClick({ button }) {
console.log('Clicked button is', button);
}
const clickEvent = event();
const unsubscribe = clickEvent.on(handleClick);
const keyPressEvent = event();
function handleInput({ button, key }) {
}
const inputEvent = Event.merge(clickEvent, keyPressEvent);
inputEvent.on(handleInput);
function handleLeftClick() {
console.log('Left button is clicked');
}
const leftClickEvent = clickEvent.filter(({ button }) => button === 'left');
leftClickEvent.on(handleLeftClick);
clickEvent({ button: 'right' });
clickEvent({ button: 'left' });
clickEvent({ button: 'middle' });
keyPressEvent({ key: 'A' });
keyPressEvent({ key: 'B' });
keyPressEvent({ key: 'C' });
leftClickEvent.off(handleLeftClick);
unsubscribe();License
License The MIT License Copyright (c) 2021 Ivan Zakharchanka