main-site/styled.d.ts

import 'styled-components'

declare module 'styled-components' {
  export interface DefaultTheme {
    themeName: string,
    themeId: number,
    colors: {
      background: string,
      primary: string,
      secondary: string,
      online: string,
      loading: string,
      offline: string,
    }
  }
}