TypeError: color.charAt is not a function

[rofiuddin15]

I have some warning like this:

TypeError: color.charAt is not a function

decomposeColor
node_modules/@material-ui/core/esm/styles/colorManipulator.js:125

  122 |   return color;
  123 | }
  124 | 
> 125 | if (color.charAt(0) === '#') {
  126 |   return decomposeColor(hexToRgb(color));
  127 | }
  128 | 

lighten
node_modules/@material-ui/core/esm/styles/colorManipulator.js:270

Array.onUpdate
node_modules/jss-plugin-rule-value-function/dist/jss-plugin-rule-value-function.esm.js:46

[joshwooding]

Please provide a reproducible example. I would also check your imports and make sure they are less than 2 path levels.

[KitsonBroadhurst]

For anyone else with this issue, I'd just done something dumb and assigned a primary text color like this:
text: { primary: { 500: '#467fcf' }, ... }
rather than this:
text: { primary: '#467fcf', ... }

[oliviertassinari]

Thanks for the feedback. It sounds like we should be able to improve the error message :). The current one is cryptic.

[mugungalabz]

The comments marked off-topic are what I used to solve this same issue.

[oliviertassinari]

@Mugungaman Do you have a reproduction for the error? How can we reproduce it?

[mugungalabz]

This recreates, where 'content' is a style applied to a component...

App.js:

const theme = createMuiTheme({
 ...,
  content: {
    padding: 25,
    objectFit: "cover"
  }
});

Child component:

const styles = theme => ({
  ...theme
});

<CardContent className={classes.content}>

...and this fixes it, wrapping the style name 'content' in a spreadIt object:

App.Js:

const theme = createMuiTheme({
...,
  spreadIt: {
    content: {
      padding: 25,
      objectFit: "cover"
    }
  }
});

Child component:

const styles = theme => ({
  ...theme.spreadIt
});

<CardContent className={classes.content}>

[oliviertassinari]

I have no idea how developers are creating this issue. Let's close until we have a full reproduction.

[vishal-vp]

@oliviertassinari I have reproduced this. Please check this sandbox https://codesandbox.io/s/material-uiissues16341-7mfwk

[vishal-vp]

I have figured it out. The problem was due to using the colors wrongly in theme. The following code causes the error.

const theme = createMuiTheme({
  palette: {
    primary: {
      main: purple,
    },
    secondary: {
      main: green,
    },
  },
  status: {
    danger: "orange"
  }
});

The correct way to use colors in theme is as follows: (Notice that value of primary should be the color and not the main key of primary object).

const theme = createMuiTheme({
  palette: {
    primary: purple,
    secondary: green,
  },
  status: {
    danger: "orange"
  }
});

To be honest the official documentation does not consolidate all the aspects of customizing theme. It is broken down into different pages. I guess it causes some confusion.

After getting familiar with the material-ui, I was able to spot this mistake.

[gota1993]

"@material-ui/core": "^4.9.5",

I have same issue.

In App.js I have

const theme = createMuiTheme({
  palette: {
    primary: { main: '#3f50b5' },
    secondary: { main: '#f44336' },
  },
  customError: { color: 'red' }
});

In child component, I have

const styles = theme => ({ ...theme });
export default withStyles(styles)(Login);

and here is error

[gota1993]

I have figured it out. The problem was due to using the colors wrongly in theme. The following code causes the error.

const theme = createMuiTheme({
  palette: {
    primary: {
      main: purple,
    },
    secondary: {
      main: green,
    },
  },
  status: {
    danger: "orange"
  }
});

The correct way to use colors in theme is as follows: (Notice that value of primary should be the color and not the main key of primary object).

const theme = createMuiTheme({
  palette: {
    primary: purple,
    secondary: green,
  },
  status: {
    danger: "orange"
  }
});

To be honest the official documentation does not consolidate all the aspects of customizing theme. It is broken down into different pages. I guess it causes some confusion.

After getting familiar with the material-ui, I was able to spot this mistake.

this doesn't fix issue for me

[vishal-vp]

@gota1993 Try to reproduce it at https://codesandbox.io/ and share it so that others can debug it.

[NelsonZeng25]

Top voted answer for this question fixed it for me.
https://stackoverflow.com/questions/56897838/getting-a-error-typeerror-color-charat-is-not-a-function-in-c-node-modul

[Taraass]

i just run npm install @material-ui/[email protected] and problem was solved

[bengbengku]

This recreates, where 'content' is a style applied to a component...

App.js:

const theme = createMuiTheme({
 ...,
  content: {
    padding: 25,
    objectFit: "cover"
  }
});

Child component:

const styles = theme => ({
  ...theme
});

<CardContent className={classes.content}>

...and this fixes it, wrapping the style name 'content' in a spreadIt object:

App.Js:

const theme = createMuiTheme({
...,
  spreadIt: {
    content: {
      padding: 25,
      objectFit: "cover"
    }
  }
});

Child component:

const styles = theme => ({
  ...theme.spreadIt
});

<CardContent className={classes.content}>

Thank you, its work!

[MOIN-AKHTAR]

I was also facing this problem but problem solved when i put my custom styling in an object and other MUIStyling in a separate object such as palete and much more I have a login and signup form for which i have made styling and this styling is inside loginSignupStyle Object look at this example

{
    palette:{
      primary:{
         light:"#33C9DC",
         main:"#00BCD4",
         dark:"#008394",
         contrastText:"#fff"
      },
      secondary:{
        light:"#FF6333",
        main:"#FF3D00",
        dark:"#B22A00",
        contrastText:"#fff"
      }
    },
    loginSignupStyle:{
    image:{
        margin:"10px auto"
    },
   form:{
       textAlign:"center"
   },
   textFeild:{
       margin:"10px auto"
   },
   loginBtn:{
       marginTop:10,
       position:"relative"
   },
   errorText:{
       color:"red",
       fontSize:"0.8rem",
       display:"block",
       margin:"10px auto"
   },
   account:{
       display:"block",
       marginTop:10
   },
   loading:{
       position:"absolute"
   }
   }
}

It worked for me

[spacejamjim]

So after reading all of this it seems there is no way to have nested objects inside of a palette?

i.e. the following is impossible:

palette: {
  notifications: {
    error: {
      main: '#C42014',
      dark: '#CC4137',
      light: '#DB7A73',
    },
    success: {
      main: '#111',
      dark: '#222',
      light: '#333',
    },
  },
}

so I have to do the following ?

palette: {
    notificationError: {
        main: '#C42014',
        dark: '#CC4137',
        light: '#DB7A73',
    },
    notificationSuccess: {
        main: '#111',
        dark: '#222',
        light: '#333',
    },
}

[Janitha133]

I was also facing this problem but problem solved when i put my custom styling in an object and other MUIStyling in a separate object such as palete and much more I have a login and signup form for which i have made styling and this styling is inside loginSignupStyle Object look at this example

{
    palette:{
      primary:{
         light:"#33C9DC",
         main:"#00BCD4",
         dark:"#008394",
         contrastText:"#fff"
      },
      secondary:{
        light:"#FF6333",
        main:"#FF3D00",
        dark:"#B22A00",
        contrastText:"#fff"
      }
    },
    loginSignupStyle:{
    image:{
        margin:"10px auto"
    },
   form:{
       textAlign:"center"
   },
   textFeild:{
       margin:"10px auto"
   },
   loginBtn:{
       marginTop:10,
       position:"relative"
   },
   errorText:{
       color:"red",
       fontSize:"0.8rem",
       display:"block",
       margin:"10px auto"
   },
   account:{
       display:"block",
       marginTop:10
   },
   loading:{
       position:"absolute"
   }
   }
}

It worked for me

After that, get it in child component like this way

const styles = (theme) => ({
  ...theme.loginSignupStyle,
});

It worked for me