You can kinda define generators with an arrow function, kinda:

   const foo = (function*() {
      yield 1;
   })();
   console.log(foo.next().value);

I've only written one generator in "real life" and ended up replacing it anyway:

  // A generator function that returns a rotating vector
   function* circlePath(stepsPerRotation = 60, theta = 0) {
     while (true) {
       theta += 2 * Math.PI / stepsPerRotation;
       yield [Math.cos(theta), Math.sin(theta)];
     }
   }