/* IMPORT */

import makeNakedPromise from '../promise-make-naked/index.js';
import type {Callback} from './types.js';

/* MAIN */

const isFunction = ( value: unknown ): value is Function => {

  return ( typeof value === 'function' );

};

const makeCounterPromise = (): { promise: Promise<void>, increment: Callback, decrement: Callback } => {

  const {promise, resolve} = makeNakedPromise<void> ();

  let counter = 0;

  const increment = (): void => {

    counter += 1;

  };

  const decrement = (): void => {

    counter -= 1;

    if ( counter ) return;

    resolve ();

  };

  return { promise, increment, decrement };

};

/* EXPORT */

export {isFunction, makeCounterPromise};