hexToRGB.js

/**
 * Преобразовать `#FF0000` -> `rgba(255, 0, 0, 1)`
 * https://stackoverflow.com/a/28056903
 * 
 * @param {string} hex 
 * @param {number} alpha 
 */
export function hexToRGB(hex, alpha) {
    const r = parseInt(hex.slice(1, 3), 16);
    const g = parseInt(hex.slice(3, 5), 16);
    const b = parseInt(hex.slice(5, 7), 16);

    if (alpha) {
        return `rgba(${r}, ${g}, ${b}, ${alpha})`;
    }
    return `rgb(${r}, ${g}, ${b})`;
}