useEffect which runs after component is mounted

useMountedEffect.tsx

import { useRef, useEffect } from 'preact/hooks';

export function useMountedEffect(cb: () => void, deps?: ReadonlyArray<unknown>): void {
  const didMount = useRef(false);

  useEffect(() => {
    if (didMount.current) cb();
    else didMount.current = true;
  }, deps);
}