Declare fonts for theming

fonts.jsx

const Fonts = {
    fontFamily: 'your fonts name',
    fontSize: {
        12: '12px',
        14: '14px',
        16: '16px',
        20: '20px',
        24: '24px',
        32: '32px',
        48: '48px',
    },
    lineHeight: {
        12: '19.416px',
        14: '22.652px',
        16: '25.888px',
        20: '32.360px',
        24: '38.832px',
        32: '51.776px',
        48: '77.664px',
    },
}

export default Fonts