javascript read file lines into array vanilla

// As with JSON, use the Fetch API & ES6
fetch('something.txt')
  .then(response => response.text())
  .then(data => {
  	// Do something with your data
  	console.log(data);
  });const fileUrl = '' // provide file location

fetch(fileUrl)
   .then( r => r.text() )
   .then( t => console.log(t) )
const fileList = event.target.files;
let fileContent = "";

const fr = new FileReader();
fr.onload = () => {
  fileContent = fr.result;
  console.log('Commands', fileContent);
}

fr.readAsText(fileList[0]);