CoEventEmitter

API

$3

Subscribes for an event. CoEventEmitter allows to subscribe for an event only once. Throws an Error if there is already a listener for an event.

Examples:

``js
//GeneratorFunction implementation
events.on('event-name', function *() {
return 'result';
});

//Async/Await implementation
events.on('event-name', async function () {
return 'result';
});

//Thunk implementation
events.on('event-name', (cb) => {
cb(null, 'result');
});

//Promise implementation
events.on('event-name', new Promise((resolve, reject) => {
resolve('result');
}));

//Promise v2 implementation
events.on('event-name', () => {
return Promise.resolve('result');
});

events.emit('event-name', 'hello world')
.then((result) => console.log(result)); //'hello world'
`

$3

Removes a subscription for an event. Throws an error if no event listener found.

`js
events.off('event-name');
`

$3

Return true if there is a registered listener for a provided event.

`js
events.has('event-name');
`

$3

Emits an event and returns a promise. Throws an error if no event listener found.

`js
events.call('event-name')
.then((result) => { / handle result / })
.catch((err) => { / handle err / });
}
`

$3

Emits an event. Returns a boolean value indicating if listener have been found.

`js
events.emit('event-name');
``