window.setTimeout(checkAuth,100) code example

Example 1: javascript run something after x seconds

setTimeout(function(){
  location.reload();
}, 3000); //run this after 3 seconds

Example 2: javascipt delay

async function delay(delayInms) {
      return new Promise(resolve  => {
        setTimeout(() => {
          resolve(2);
        }, delayInms);
      });
    }
    async function sample() {
      console.log('a');
      console.log('waiting...')
      let delayres = await delay(3000);
      console.log('b');
    }
    sample();