It does not work

import {BreakpointsOverride} from '@mui/material/styles
declare module '@mui/material/styles' {
interface BreakpointsOverride {
    xs: true
    sm: true
    mobileL: true
    md: true
    lg: true
    xl: true
  }
}

Without import import {BreakpointsOverride} from '@mui/material/styles', it works but, after when i try to import something from @mui/material/styles its contains only BreakpointsOverride