[styled-components]theme

App.tsx

import styled, { ThemeProvider } from 'styled-components'

const Button = styled.button`
  color: ${p => p.theme.color}; // ← green
`
export const App = () => {
  return (
    <ThemeProvider theme={{ color: 'green' }}>
      <Button>Themed</Button>
    </ThemeProvider>
  )
}