rn-product-card/src/hooks/useProduct.ts

Este es un paquete de pruebas de despliegue en NPM

import { useEffect, useRef, useState } from 'react';
import { onChangeArgs, Product, InitialValues } from '../interfaces/interfaces';

interface useProductArgs {
    product: Product;
    onChange?: ( args: onChangeArgs ) => void;
    value?: number;
    initialValues?: InitialValues;
}

export const useProduct = ({ onChange, product, value = 0, initialValues }: useProductArgs ) => {
    const [ counter, setCounter ] = useState( initialValues?.count || value );
    const isMounted = useRef(false);

    const increaseBy = ( value: number ) => {

        let newValue = Math.max(counter + value, 0);
        if ( initialValues?.maxCount ) {
            newValue = Math.min( newValue, initialValues.maxCount );
        }
        setCounter( newValue );
        onChange && onChange({ count: newValue, product });
    }

    const reset = () => {
        setCounter( initialValues?.count || value );
    }

    useEffect(() => {
        if ( !isMounted.current ) return;
        setCounter( value );
    }, [ value ]);

/*    useEffect(() => {
        isMounted.current = true;
    }, []);*/

    return {
        counter,
        isMaxCountReached: !!initialValues?.count && initialValues.maxCount === counter,
        maxCount: initialValues?.maxCount,

        increaseBy,
        reset,
    }
}