nj10-product-card/src/hooks/useProduct.ts

Este es un paquete de pruebas de despliegue en NPM

import { useEffect, useRef, useState } from 'react'
import { InitialValues, onChangeArgs, Product } 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<number>( initialValues?.count || value );
    const isMounted = useRef(false);

    console.log(initialValues?.count);

    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]);

    return {
        //*Properties
        counter,
        isMaxCountReached: !!initialValues?.count && initialValues.maxCount === counter,
        maxCount: initialValues?.maxCount,
        //*Methods
        increaseBy,
        reset
    }
}