message: refactor(util): upFirst and downFirst
diff: @@ -2,11 +2,11 @@ import { noCase } from 'no-case'
  import { StyliPlugin, PluginCategory } from '@styli/types'
  export function upFirst(s: string = '') {
  - return s.charAt(0).toUpperCase() + s.slice(1)
  + return s.replace(/^[a-z]/, (g) => g.toUpperCase())
  }
  export function downFirst(s: string = '') {
  - return s.charAt(0).toLowerCase() + s.slice(1)
  + return s.replace(/^[A-Z]/, (g) => g.toLowerCase())
  }
  export function kebab(s: string) {
  