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diff --git a/src/use-interval.js b/src/use-interval.js
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+// lifted from here:
+// https://overreacted.io/making-setinterval-declarative-with-react-hooks/
+import React, { useState, useEffect, useRef } from 'react'
+
+export const useInterval = (callback, delay) => {
+  const savedCallback = useRef()
+
+  // Remember the latest callback.
+  useEffect(
+    () => {
+      savedCallback.current = callback
+    },
+    [callback]
+  )
+
+  // Set up the interval.
+  useEffect(
+    () => {
+      function tick() {
+        savedCallback.current()
+      }
+      if (delay !== null) {
+        let id = setInterval(tick, delay)
+        return () => clearInterval(id)
+      }
+    },
+    [delay]
+  )
+}