Fastest and smallest once wrapper in js

lazy.ts

const unit = <T>(value: T) => () => value;
const lazy = <T>(fn: () => T) => {
  let f = (): T => (f = unit(fn()))();
  return () => f();
};

const lazyWithReset = <T>(fn: () => T) => {
  let f: () => T;
  const reset = () => {
    f = () => (f = unit(fn()))();
  }
  reset();
  return Object.assign(() => f(), { reset });
};