Guide to managing MUI's theme typography font weight choices with TypeScript

I am interested in learning how to incorporate a new font weight into my theme, for example, fontWeightSemiBold, and disable the existing fontWeightLight and fontWeightMedium. I believe this can be achieved through module augmentation. For reference, there is an example of customizing Typography's variants available here. Ideally, I would like to specify this in my theme configuration.

export const theme = createTheme({
  typography: {
    fontWeightSemiBold: 600,
  },
});

Furthermore, I want to use this new font weight in JSX without encountering any issues with TypeScript.

<Typography sx={{ fontWeight: 'fontWeightSemiBold' }}>Hello</Typography>
typescriptmaterial-ui

Answer №1

To enhance the functionality, utilize module augmentation and modify the createTypography module.

declare module '@mui/material/styles/createTypography' {
  interface TypographyOptions {
    letterSpacingLarge?: number
  }

  interface Typography {
    letterSpacingMedium: number
  }
}

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