promised-timer

promised-timer

Promisified Javascript Timer

import Timer from 'promised-timer';

let aTimer = Timer.Seconds(5);

startButton.onClick(() => {
  aTimer.start()
    .then(() => doSomething())
    .catch((e) => log('Exception in doSomething', e))
});

cancelButton.onClick(() => aTimer.cancel());
rightNowButton.onClick(() => aTimer.trigger());

A timer can be started multiple times, canceled, paused and rewound. Paused timer can be resumed to continue up to initial time.

Static Timer.delay method serves well for simpler cases.

Stopwatch

Attach multiple promises to timeline

import { Stopwatch } from 'promised-timer';

const w = new Stopwatch();
w.at(300).then(elapsed => {
      elapsed == 300
  });

w.at(1000).then(elapsed => {
      elapsed == 1000
  });

w.start().then(() => "stopwatch stopped", () => "stopwatch cancelled");

Timer.delay(3000, w.stop());

The stopwatch can be paused and resumed.

Swapping Promise implementation

By default Timer assumes native Promise or polyfill but any Promise implementation can be used by setting Timer.Promise property.

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Development Requirements

Typescipt 2.0+

Commands

• npm run build - build a version
• npm run clean - removes dist and build folder
• npm start - starts local dev server at http://localhost:8006/
• npm run lint - lint
• npm test - runs karma tests
• npm run test:watch - watch tests