I've created a stand-alone React component that uses the Material UI (4.8.3) library and published this to a private NPM package in order that it can be used in a range of apps.
The stand-alone component project works fine (I'm using Storybook to test the component), but when I publish and then import the component into a new React project (created using create-react-app) I get the warning:
It looks like there are several instances of `@material-ui/styles` initialized in this application. This may cause theme propagation issues, broken class names, specificity issues, and makes your application bigger without a good reason.
The component renders on the page as seen below, but without any theming applied:
When it is clicked, any theming on the main React App is removed (note the dark blue bar in the background behind the menu has lost its color):
I'm using the Material UI withStyles
functionality to theme my component, which I guess is the problem as my main React app is also using this, but this is the recommended way to apply to style. Does it feel like I need to somehow inherit an instance of the theme from the main host App?
My component project was created using create-react-library and so is using Rollup (0.64.1) and babel (6.26.3).
Here is the component:
import React, {Component} from 'react'
import { withStyles } from '@material-ui/core/styles'
const styles = theme => ({
root: {
fontSize: '14px',
}
})
// --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
class MyComponent extends Component {
render() {
const { classes } = this.props
return (
<div className={classes.root}>Hello world</div>
)
}
}
export default withStyles(styles)(MyComponent)
Which is published to an NPM package and then imported into the main app using:
import React, { Component } from 'react'
import { MyComponent } from '@xxx/mycomponent'
const styles = theme => ({
root: {
display: "flex",
flexGrow: 1
}
});
// --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
// Class
// --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
class App extends Component {
//
// --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
render() {
//
const { classes } = this.props;
return (
<div className={classes.root}>
<MyComponent />
</div>
);
}
}
export default withRouter(withStyles(styles)(App))
I have an almost identical setup and ran into this exact issue when importing the components into a different project. I should mention that we're using webpack to build the app that's consuming the component. It was suggested to me to try the following in my webpackconfig:
module.exports = {
...
resolve: {
alias: {
"@material-ui/styles": require.resolve("@material-ui/styles")
}
}
}
This worked great for my case.
For reference: https://webpack.js.org/configuration/resolve/
你应该在你的故事书中链接 @material-ui/styles 所以首先需要在你的故事书中而不是在你的应用程序中npm link @material-ui/styles
I had the same issue, but I do not use StoryBook. This is the first link in Google, so I post my case here, as it might help.
This is the link on how to fix the alert , but it does not work for me. npm dedupe
does nothing and I am unable to change config since I am using create-react-app.
So I did following:
npm i
import styles from '@material-ui/styles'
to import styles from '@material-ui/core/styles'
Please try to install the below package. This helped resolve my issue.
npm i @mui/material
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