timemitter

Time based event Emitter for casual use.

Internal clock is a setInterval(), so I don't reccomend this for serious use.

Install

npm install timemitter
# or
yarn add timemitter

Usage

import Timemitter from 'timemitter';

const timer = new Timemitter();
timer
  .at(0, time => console.log(`${time}: start!`))
  .at(3, time => console.log(`${time}: at 3sec`))
  .at(5, time => console.log(`${time}: at 5sec`))
  .every(2, time => console.log(`${time}: every 2sec`))
  .at(60, time => console.log(`${time}: at 1min`))
  .start();

This code logs,

0: start!
2: every 2sec
3: at 3sec
4: every 2sec
5: at 5sec
6: every 2sec
8: every 2sec

// ...

60: at 1min
60: every 2sec

API

at(time, handler)

Fire handler only once at specified time.

• time: number
• handler: (time: number) => {}

new Timemitter()
  .at(3, time => console.log(`Fired after ${time}sec`)) // 3
  .start();

If negative value passed to time, it is treated as 0.

every(time, handler)

Fire handler every time in interval.

• time: number
• handler: (time: number) => {}

new Timemitter()
  .every(3, () => console.log(`Fired after every ${time}sec`)) // 3, 6, 9, 12...
  .start();

If zero or negative value passed to time, it is treated as 1.

start(interval)

Start the timer. Default interval is 1sec = 1000.

• interval: number

new Timemitter()
  .at(2, () => console.log(`Fired after ${time} * 0.5sec`))
  .start(500);

In this case, interval is 500. So handler called in 1sec.

pause() / resume()

Pause and resume timer.

const timer = new Timemitter();

timer
  .at(0, () => console.log('fire'))
  .at(2, () => timer.pause())
  .at(3, () => console.log('will not fire');

If you resume later, timer will restart from paused time.

timer.resume();

In this case, timer restarts from 2, next fire time is 3.

reset()

Reset timer count to 0.

const timer = new Timemitter();
timer
  .at(3, () => console.log('Fired after 3sec'))
  .at(5, () => timer.reset())
  .start();

This case,

• called once after 3sec
• and reset() at 5sec
• called again at 8sec point from start

destroy()

Stop interval and remove all handlers.

const timer = new Timemitter();
timer
  .at(3, () => console.log('Fired after 3sec'))
  .start();

timer.destroy();

In this case, 3sec handler do not be called.