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sample/dev/talk/bundle/awesome-notifications-3.1.1/timer.js

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+export default class {
+  constructor(callback, delay) {
+    this.callback = callback
+    this.remaining = delay
+    this.resume()
+  }
+  pause() {
+    this.paused = true
+    window.clearTimeout(this.timerId)
+    this.remaining -= new Date() - this.start
+  }
+  resume() {
+    this.paused = false
+    this.start = new Date()
+    window.clearTimeout(this.timerId)
+    this.timerId = window.setTimeout(() => {
+      window.clearTimeout(this.timerId)
+      this.callback()
+    }, this.remaining)
+  }
+  toggle() {
+    if (this.paused) this.resume()
+    else this.pause()
+  }
+}