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Responsive typography

See original GitHub issue

I have created a functionality in my theme file to make the typography styles responsive:

Feature description

const mediaSizes = {
  smallPhone: 320,
  bigPhone: 480,
  tablet: 600,
  bigTablet: 801,
  tabletLaptop: 1025,
  desktop: 1281
}

const makeFontSizeResponsive = fontSize => {
  const fontNumber = fontSize.slice(0, -2)
  const result = {
    [mediaQueries['smallPhone']]: { fontSize: `${fontNumber * 0.7}px` },
    [mediaQueries['bigPhone']]: { fontSize: `${fontNumber * 0.75}px` },
    [mediaQueries['tablet']]: { fontSize: `${fontNumber * 0.8}px` },
    [mediaQueries['bigTablet']]: { fontSize: `${fontNumber * 0.85}px` },
    [mediaQueries['tabletLaptop']]: { fontSize: `${fontNumber * 0.9}px` },
    [mediaQueries['desktop']]: { fontSize: `${fontNumber}px` }
  }
  return result
}
const newTheme = createTheme({
  ...,
  'typography': {
    'font100': {
      'fontFamily': 'Helvetica, Arial, sans-serif',
      'fontSize': '11px',
      'fontWeight': 'normal',
      'lineHeight': '1.45em',
      ...makeFontSizeResponsive('11px')
    },
  ...
}

However these do not work with the baseui typography classes because the fonts prop is filtered by individual keys, and I believe that the styles are also not deep merged. I could create my own custom typography components and probably will due to time, but I think it would be good to allow this. If there is a better way please advise?

See: https://github.com/uber-web/baseui/blob/master/src/block/styled-components.js#L86