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import curryN from './curryN';

import { Func } from '../typings/types';

interface DebounceFunc<T extends () => any> {

(...args: Parameters<T>): void;

cancel: Function;

}

interface Debounce {

<F extends Func>(wait: number, fn: F): DebounceFunc<F>;

(wait: number): <F extends Func>(fn: F) => DebounceFunc<F>;

}

/**

* Creates a debounced function that delays invoking `func` until after `wait`

* milliseconds have elapsed since the last time the debounced function was

* invoked. Delayed function invocation might be cancelled by calling cancel method.

* @param {number} wait The number of milliseconds to delay.

* @param {Function} fn The function to debounce.

* @returns {Function} Returns the new debounced function.

export default curryN(

<F extends Func>(wait: number, fn: F): DebounceFunc<F> => {

let timeout;

function f() {

let args = arguments;

clearTimeout(timeout);

timeout = setTimeout(

() => fn.apply(this, args), // eslint-disable-line prefer-rest-params

wait

);

}

f.cancel = () => clearTimeout(timeout);

return f;

}

) as Debounce;