Struggling with TypeScript Errors while Extending Theme Colors in Material UI React using TypeScript

Just started with typescript and feeling a bit lost, can someone offer some guidance? I'm working on a React project using material-ui with typescript. To add a new color the correct way, it needs to be added to a theme:

const theme = createMuiTheme({
  palette: {
    primary: {
      main: blue[400]
    },
    secondary: {
      main: green[500]
    },
    neutral: {
      main: "#abcdef" // <-- NEW COLOR
    }
  }
})

According to the docs, you then use this theme in your ThemeProvider wrapper component whenever needed. However, if using typescript, one has to extend the Palette interface as shown in the example from the docs:

declare module "@material-ui/core/styles/createPalette" {
  interface Palette {
    neutral: Palette["primary"]
  }
  interface PaletteOptions {
    neutral: PaletteOptions["primary"]
  }
}

This is all making sense so far! No more complaints from typescript about the new property in the palette. Now, it's time to test out the new color! But when trying to use it in a component:

<IconButton color="neutral" onClick={onClose}>
   <CloseIcon />
</IconButton>

And here's where confusion sets in. Typescript raises an issue! The 'color' prop doesn't recognize "neutral" as a valid option.

Screenshot of the error

As a newcomer, I might be overlooking something obvious.

I believe that there should be a simple solution to get colors recognized correctly without resorting to ts-ignore. Can anyone provide some insight?

{/* 
// @ts-ignore */}
<IconButton color="neutral" ...

(hoping to avoid this workaround)

I'm sure there's a straightforward fix to use colors the proper way, I just need a little guidance. Please assist!

Answer №1

Remember that when using the color prop with IconButton, you are limited to only modifying existing theme colors like primary and secondary. This restriction is hardcoded in the material-ui library and will not change in upcoming versions.

You can only override styles using className/classes, as suggested by Barryman9000.


Regarding type definitions, it's challenging to override PropTypes.Color in version 4.x. However, in version 5.x(@next), you can modify the acceptable values for the color prop by extending or restricting the IconButtonPropsColorOverrides interface:

interface IconButtonPropsColorOverrides {
  neutral: true // allow `neutral` as a color prop value
  primary: false // disallow using `primary`
}

Keep in mind that you'll need to implement the actual behavior logic for these values to work properly (as of the current state of the code in 2021).

Answer №2

Encountered this issue before. It seems that the problem lies in simply extending the theme object without considering that the <IconButton /> component's color prop expects a type of PropTypes.Color, where Color is a union type accepting only four specific values.

export namespace PropTypes {
  type Color = 'inherit' | 'primary' | 'secondary' | 'default';
}

I've experimented with various solutions to work around this limitation. One approach involves using the useTheme() hook to access the neutral color from your palette directly within the component, or creating a styled component to access the palette from there.

Example using the hook in your component:

const MyComponent = () => {
  const { palette } = useTheme();

  return (
    <IconButton
      color={palette.neutral.main}
    >...</IconButton>
  );
}

Example using a styled-component:

const MyStyledComponent = styled(IconButton)(({ theme }) => ({
  color: theme.palette.neutral.main
}));

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