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once-promised

| Create a promise for an event, once

usage

import oncePromised from 'once-promised'
const emitter = new EventEmitter()
 
const promise = oncePromised(emitter, 'test')
 
promise.then(arg => {
  console.log('The event fired!')
  console.log('the argument was:', arg)
  // => the argument was an argument
})
 
emitter.emit('test', 'an argument')

It is also possible to pass an alternative promise implementation in as a third argument it will be called with new