once is a function wrapper that wraps another function. The wrapped function will only be executed exactly once, no matter what arguments are passed in subsequent calls.

once.ts

type AnyFunc = (...args: any) => any;

export function once(func: AnyFunc): AnyFunc {
  let alreadyCalled = false;
  return (...args: any[]): any => {
    if (alreadyCalled) {
      return undefined;
    }

    alreadyCalled = true;
    return func(args);
  };
}

useOnce.ts

import { once } from './once';

function logSomething() {
  console.log('something');
}

const logSomethingOnce = once(logSomething);

logSomethingOnce();
logSomethingOnce();