What could be the root of this Typescript error related to the SX prop?

I found this code snippet on https://mui.com/system/the-sx-prop/ and tried implementing it, but encountered a TypeScript error.

sx={(theme: Theme): SxProps<Theme> | undefined => ({
  ...theme.typography.body,
  color: theme.palette.primary.main,
})}

Type '(theme: Theme) => SxProps<Theme> | undefined' is not compatible with type 'SxProps<Theme> | undefined'.
  Type '(theme: Theme) => SxProps<Theme> | undefined' is not assignable to type 'CSSSelectorObject<Theme>'.
    Index signature for type 'string' is missing in type '(theme: Theme) => SxProps<Theme> | undefined'.ts(2322)
StatusBar.component.tsx(46, 12): Did you mean to call this expression?
typescriptmaterial-uisx

Answer №1

You don't need to specify the Type when writing code.

  <Box
     sx={(theme) => ({
       ...theme.typography.body1,
       color: theme.palette.primary.main,
     })}>
            <h1>Something</h1>
   </Box>

If you wrap your App component with ThemeProvider, this code will work perfectly fine even for Typescript.

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