Expanding the Mui Typescript breakpoints within a TypeScript environment

Encountering a typescript error when attempting to utilize custom names for breakpoint values:

Type '{ mobile: number; tablet: number; desktop: number;}' is not compatible with type '{ xs: number; sm: number; md: number; lg: number; xl: number; }'.
  Object literal can only define known properties, and 'mobile' is not present in the type '{ xs: number; sm: number; md: number; lg: number; xl: number; }'.

Below is my ThemProvider implementation:

import { ThemeProvider, createTheme } from "@mui/material/styles";

<ThemeProvider
  theme={createTheme({
    breakpoints: {
      values: {
        mobile: 480,
        tablet: 750,
        desktop: 1076,
      },
    },
  })}

Attempts were made to include a declaration file, which resulted in an import error stating: Module '"@mui/material/styles"' does not have any exported member 'ThemeProvider'. Module '"@mui/material/styles"' does not have any exported member 'createTheme'.

declare module "@mui/material/styles" {
  interface BreakpointOverrides {
    xs: false; // removes the `xs` breakpoint
    sm: false;
    md: false;
    lg: false;
    xl: false;
    mobile: true; // adds the `mobile` breakpoint
    tablet: true;
    laptop: true;
    desktop: true;
  }
}
typescriptmaterial-ui

Answer №1

It's been a while since we last discussed this, but it seems like the solution is in this provided answer. However, we need to make adjustments for the updated mui folder structure.

import { CustomBreakpoints } from '@mui/system/createTheme/createBreakpoints';

declare module '@mui/system/createTheme/createBreakpoints' {
  interface CustomBreakpoints {
    xs: false;
    sm: false;
    md: false;
    lg: false;
    xl: false;
    mobile: true;
    tablet: true;
    laptop: true;
    desktop: true;
    desktopApp: true;
    largeDesktop: true;
  }
}

declare module '@mui/material/styles/createTheme' {
  interface ThemeOptions {
    breakpoints?: CustomBreakpoints;
  }
}

// ...

const customTheme = {
  // ...
  breakpoints: {
    values: {
      desktopApp: 1024,
      mobile: 0,
      tablet: 481,
      laptop: 768,
      desktop: 1024,
      largeDesktop: 1200,
    },
  },
  // ...
};

Answer №2

Enclose 

declare module "@mui/material/styles"
within declare global

declare global {
  declare module '@mui/material/styles' {
    interface BreakpointOverrides {
      xs: false; // eliminates the `xs` breakpoint
      sm: false;
      md: false;
      lg: false;
      xl: false;
      mobile: true; // introduces the `mobile` breakpoint
      tablet: true;
      laptop: true;
      desktop: true;
    }
  }
}

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