eventuate-once

Act once upon the next occurrence of an eventuate. Optionally act upon only the next matching occurrence.

example

var eventuate = require('eventuate'),
    once      = require('eventuate-once')

var request = eventuate()

// once cb
once(request, function (req) {
    console.log(req)
})
request.produce({ url: '/index.html' })

// once promise
once(request).then(console.log)
request.produce({ url: '/README.md' })

// will result in no actions because consumers are gone
// (use "requireConsumers" to make this an error condition)
request.produce({ url: '/LICENSE' })

api

var once = require('eventuate-once')

once(eventuate [, cb])

Execute the optional cb (if provided) one time on the next data payload from the eventuate. This is like eventuate(cb) except that it only happens once. In addition, returns a Promise that resolves to the eventuate data payload.

once.match(eventuate, filter [, cb])

Execute the optional cb (if provided) one time on the next data payload from the eventuate, for which a truthy value is returned from the filter function. In addition, returns a Promise that resolves to the matched eventuate data payload.

The filter argument should be a function with signature function (data). It will be passed all events produced by the eventuate, and it should return a falsey value or truthy value. Upon returning a truthy value, no more events will be provided, and the callbacks/promise will be resolved.

testing

npm test [--dot | --spec] [--grep=pattern]

Specifying --dot or --spec will change the output from the default TAP style. Specifying --grep will only run the test files that match the given pattern.

coverage

npm run coverage [--html]

This will output a textual coverage report. Including --html will also open an HTML coverage report in the default browser.