MUI - makeStyles - 无法读取未定义的属性

Question

I'm studying MUI, and in the course, the instructor asks me to style just one component and not the entire theme.

For that, it uses the makeStyles function and spreads the theme.mixins.toolbar . The problem is when I do this, I have the following error:

TypeError: Cannot read properties of undefined (reading 'toolbar')

This course is apparently in version 4, and I am using version 5. Despite this, my code appears to follow the changes that the documentations asks for. So what could be causing this error?

app.js

import "./App.css";
import Header from "./components/ui/Header";
import { ThemeProvider } from "@material-ui/core/styles";
import theme from "./components/ui/Theme";

function App() {
    return (
        <ThemeProvider theme={theme}>
            <Header />
        </ThemeProvider>
    );
}

export default App;

Theme.js

import { createTheme } from "@material-ui/core/styles";

const arcBlue = "#0B72B9";
const arcOrange = "#FFBA60";

export default createTheme({
    typography: {
        h3: {
            fontWeight: 100,
        },
    },
    palette: {
        common: {
            blue: `${arcBlue}`,
            orange: `${arcOrange}`,
        },
        primary: {
            main: `${arcBlue}`,
        },
        secondary: {
            main: `${arcOrange}`,
        },
    },
});

header/index.jsx

import React from "react";
import AppBar from "@mui/material/AppBar";
import Toolbar from "@mui/material/Toolbar";
import useScrollTrigger from "@mui/material/useScrollTrigger";
import Typography from "@mui/material/Typography";
import { makeStyles } from "@material-ui/styles";

function ElevationScroll(props) {
    const { children, window } = props;
    const trigger = useScrollTrigger({
        disableHysteresis: true,
        threshold: 0,
        target: window ? window() : undefined,
    });

    return React.cloneElement(children, {
        elevation: trigger ? 10 : 0,
    });
}

const useStyles = makeStyles((theme) => ({
    toolbarMargin: { ...theme.mixins.toolbar },
}));

function Header() {
    const classes = useStyles();
    return (
        <React.Fragment>
            <ElevationScroll>
                <AppBar color="primary">
                    <Toolbar>
                        <Typography variant="h3" component="h3">
                            Nome de teste
                        </Typography>
                    </Toolbar>
                </AppBar>
            </ElevationScroll>
            <div className={classes.toolBarMargin} />
        </React.Fragment>
    );
}

export default Header;

Answer 1

I created a project on CodeSandbox and it doesn't seem the problem in code. I guess you need to check the version of package you installed in package.json file.

Here is the link to the CodeSandbox project and you can see the console.log message on console tab.

https://codesandbox.io/s/check-makestyle-eq67m?file=/src/components/ui/Header/index.js

Answer 2

Since you're using v5, change your ThemeProvider , createTheme and makeStyles import path from:

import { ThemeProvider, createTheme, makeStyles } from "@material-ui/core/styles";

To:

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

@material-ui/core is v4 package and @mui/material is the v5 equivalent. The API from the 2 versions are not compatible. In v5, makeStyles is also moved to a legacy package called @mui/styles , if you are using MUI v5 in a new project, you should switch completely to styled / sx API as recommended by the MUI team.

Related answers

• Difference between @mui/material/styles and @mui/styles?
• Cannot use palette colors from MUI theme
• MUI createTheme is not properly passing theme to MUI components

Answer 3

Solution

Install @mui/styles

npm install @mui/styles

Change

import { ThemeProvider, createTheme } from "@material-ui/core/styles";

To

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

And

import { makeStyles } from "@material-ui/styles";

To

import { makeStyles } from "@mui/styles";

And

<div className={classes.toolBarMargin} />

To

<div className={classes.toolbarMargin} />

Answer 4

I faced similar issue with Can not read properties of undefined, reading refs thrown by makeStyles . In my case it was mui v5 and the issue occurred after upgrading to React 18.

In my case it turned out I had some legacy makeStyles(()=>createStyles) wrapped in a manner:

const useStyles = (minWidth: number) =>
  makeStyles((theme: Theme) => ...

I had to change it to:

const useStyles =
  makeStyles((theme: Theme) => ...

Perhaps it will be useful for somebody else facing the issue.