Rapid-Development-Timer-Assistant/timer-worker.js at main · bobvasic/Rapid-Development-Timer-Assistant · GitHub

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// Web Worker for accurate background timer
let timerInterval;
let remainingSeconds;

self.onmessage = function(e) {
  const { action, seconds } = e.data;

  if (action === 'start') {
    remainingSeconds = seconds;

    // Clear any existing interval
    if (timerInterval) {
      clearInterval(timerInterval);
    }

    // High-precision timer that works in background
    timerInterval = setInterval(() => {
      remainingSeconds--;

      // Send update back to main thread
      self.postMessage({
        type: 'tick',
        seconds: remainingSeconds
      });

      if (remainingSeconds <= 0) {
        clearInterval(timerInterval);
        self.postMessage({
          type: 'complete'
        });
      }
    }, 1000);
  }

  if (action === 'stop') {
    if (timerInterval) {
      clearInterval(timerInterval);
      timerInterval = null;
    }
  }

  if (action === 'getRemaining') {
    self.postMessage({
      type: 'remaining',
      seconds: remainingSeconds
    });
  }
};