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Get the first event in a set of event emitters and event pairs, then clean up after itself.
$ npm install ee-first
var first = require('ee-first')
Invoke listener
on the first event from the list specified in arr
. arr
is
an array of arrays, with each array in the format [ee, ...event]
. listener
will be called only once, the first time any of the given events are emitted. If
error
is one of the listened events, then if that fires first, the listener
will be given the err
argument.
The listener
is invoked as listener(err, ee, event, args)
, where err
is the
first argument emitted from an error
event, if applicable; ee
is the event
emitter that fired; event
is the string event name that fired; and args
is an
array of the arguments that were emitted on the event.
var ee1 = new EventEmitter()
var ee2 = new EventEmitter()
first([
[ee1, 'close', 'end', 'error'],
[ee2, 'error']
], function (err, ee, event, args) {
// listener invoked
})
The group of listeners can be cancelled before being invoked and have all the event listeners removed from the underlying event emitters.
var thunk = first([
[ee1, 'close', 'end', 'error'],
[ee2, 'error']
], function (err, ee, event, args) {
// listener invoked
})
// cancel and clean up
thunk.cancel()