Convert 3 digits color to 6 digits color

const toFullHexColor = (color) =>
    `#${(color.startsWith('#') ? color.slice(1) : color)
        .split('')
        .map((c) => `${c}${c}`)
        .join('')}`;

const toFullHexColor = (color: string): string =>
    `#${(color.startsWith('#') ? color.slice(1) : color)
        .split('')
        .map((c) => `${c}${c}`)
        .join('')}`;

toFullHexColor('123'); // '#112233'
toFullHexColor('#123'); // '#112233'
toFullHexColor('#abc'); // '#aabbcc'