idle-tracker/src/supportPassiveEvent.ts

Tiny pure Javascript library to track browser inactivity

let passiveSupported = false; // eslint-disable-line  import/no-mutable-exports

if (typeof window !== 'undefined') {
  try {
    const options = Object.defineProperty({}, 'passive', {
      get() {
        passiveSupported = true;
        return false;
      },
    });
    const func = () => undefined;

    window.addEventListener('test', func, options);
    window.removeEventListener('test', func, options);
  } catch (err) {
    passiveSupported = false;
  }
}

export default passiveSupported;