Support for after

[haejunejung]

As I mentioned in #153, I will proceed with the after :) @raon0211!

[raon0211]

Sure!

[haejunejung]

I've implemented this :)

export const after = <P, F extends (...args: any[]) => P>(n: number, func: F): F => {
  if (!Number.isInteger(n) || n < 1) {
    throw new Error(`n must be an integer greater than or equal to one.`);
  }

  let counter = 1;
  return ((...args: Parameters<F>) => {
    if (counter >= n) {
      return func(...args);
    }
    counter++;
  }) as F;
};

If it looks good, I proceed with enhancing the documentation and test and then I submit a pull request!