await-first

Wait the first event in a set of event pairs, then clean up after itself.

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[![Test coverage][codecov-image]][codecov-url]
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[![Known Vulnerabilities][snyk-image]][snyk-url]
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[npm-image]: https://img.shields.io/npm/v/await-first.svg?style=flat-square
[npm-url]: https://npmjs.org/package/await-first
[travis-image]: https://img.shields.io/travis/node-modules/await-first.svg?style=flat-square
[travis-url]: https://travis-ci.org/node-modules/await-first
[codecov-image]: https://codecov.io/gh/node-modules/await-first/branch/master/graph/badge.svg
[codecov-url]: https://codecov.io/gh/node-modules/await-first
[david-image]: https://img.shields.io/david/node-modules/await-first.svg?style=flat-square
[david-url]: https://david-dm.org/node-modules/await-first
[snyk-image]: https://snyk.io/test/npm/await-first/badge.svg?style=flat-square
[snyk-url]: https://snyk.io/test/npm/await-first
[download-image]: https://img.shields.io/npm/dm/await-first.svg?style=flat-square
[download-url]: https://npmjs.org/package/await-first

Install

``$ npm install await-first --save`

`Example`

- awaitFirst(ee, events)

`js const EventEmitter = require('events'); const awaitFirst = require('await-first');

async function waitMessageOrClose(ee) { const o = await awaitFirst(ee, [ 'message', 'close' ]);

switch (o.event) { case 'message': const msg = o.args[0]; // [ 'hello world' ] console.log('new message =>', msg); break; case 'close': console.log('closed'); break; } }

const ee = new EventEmitter(); waitMessageOrClose(ee);

setTimeout(() => { ee.emit('message', 'hello world'); }, 1000);`

- obj.awaitFirst(events)

`js const net = require('net'); const awaitFirst = require('await-first');

async function connect() { const socket = net.connect(8080, '127.0.0.1'); socket.awaitFirst = awaitFirst;

try { // waitconnect or errorevent await socket.awaitFirst([ 'connect', 'error' ]); } catch (err) { console.log(err); } // ... }

connect();``

await-first

Example

- awaitFirst(ee, events)

js
const EventEmitter = require('events');
const awaitFirst = require('await-first');

async function waitMessageOrClose(ee) {
  const o = await awaitFirst(ee, [ 'message', 'close' ]);

  switch (o.event) {
    case 'message':
      const msg = o.args[0]; // [ 'hello world' ]
      console.log('new message =>', msg);
      break;
    case 'close':
      console.log('closed');
      break;
  }
}

const ee = new EventEmitter();
waitMessageOrClose(ee);

setTimeout(() => {
  ee.emit('message', 'hello world');
}, 1000);

- obj.awaitFirst(events)

js
const net = require('net');
const awaitFirst = require('await-first');

async function connect() {
  const socket = net.connect(8080, '127.0.0.1');
  socket.awaitFirst = awaitFirst;

  try {
    // wait

connect or error

 event
    await socket.awaitFirst([ 'connect', 'error' ]);
  } catch (err) {
    console.log(err);
  }
  // ...
}

connect();