Awesome
modify-event
Modify the value of the specific object's event
const {EventEmitter} = require('events');
const modifyEvent = require('modify-event');
const emitter = new EventEmitter();
modifyEvent(emitter, 'foo', val => val * 2);
emitter.on('foo', data => {
data; //=> 2
});
emitter.emit('foo', 1);
Installation
npm install modify-event
API
const modifyEvent = require('modify-event');
modifyEvent(eventEmitter, eventName, modifier)
eventEmitter: EventEmitter
eventName: string
symbol
(event name)
modifier: Function
Return: EventEmitter
(a reference to the first argument)
It changes the first argument of the event listeners for a given event, in response to the return value of the modifier function.
const {EventEmitter} = require('events');
const modifyEvent = require('modify-event');
const emitter = new EventEmitter();
const eventName = Symbol('custom event name');
modifyEvent(emitter, eventName, val => `${val}b`);
modifyEvent(emitter, eventName, val => `${val}c`);
emitter
.on(eventName, listener)
.emit(eventName, 'a');
function listener(data) {
data; //=> 'abc'
}
License
Copyright (c) 2015 - 2019 Shinnosuke Watanabe
Licensed under the MIT License.