const arr2 = this.state.arr.slice()
const arr3 = [...this.state.arr]
const arr2 = this.state.arr.concat()
const arr2 = this.state.arr //можно же просто так написать
const arr1 = JSON.parse(JSON.stringify(this.state.arr))
const arr1 = this.state.arr
export {
ThemeContext,
ThemeProvider,
ThemeConsumer,
withTheme,
useTheme,
defaultTheme
} from './theme'