What causes the discrepancy in CSS display between production and development environments in Material-UI?

Using material UI (verison: ^4.12.3) Select, with a customized input has led to an unexpected issue in the production environment. The Select input in prod has a black background and a :before element with a white background that I didn't intend to have.

I'm unsure where this styling is coming from, as it's not present in my development environment. Upon comparing the CSS & HTML of both environments' Select elements, I noticed that there is a ::before element added in the prod version but not in dev.

Additionally, the background color differs between the two versions. In prod, there is a supplementary class applied to the InputBase element which adds a black background color:

Edit 1

It appears that MUI injects <style>. In the production HTML code, I can see the unwanted styles such as background-color: black and the ::before element. Despite my attempts to apply inline styles to override these injected styles, I've faced difficulty especially with the ::before element. Is there a way to disable these injected styles or find a workaround?

This is image illustrating the injected bad css:

cssreactjsmaterial-uidevelopment-environmentproduction-environment

Answer №1

To find the solution to this issue, check out this thread. It was resolved by user Mordechai.

There seems to be a conflict between webpack and MUI's JSS rules... Adding an index of one to MUI's methods could resolve this problem.

//Hook
const useStyles = makeStyles({
    // your styles here
}, {index: 1})

// HOC 
MyComponent = withStyles({
    // your styles here
}, {index: 1})(MyComponent)

Answer №2

After encountering conflicts with classNames in Material-UI due to using micro-frontend infrastructure, we resolved the issue by adding a <StylesProvider /> wrapper to the app that had the conflicting makeStyles.

Within the root component <App/>:

import {
  StylesProvider,
  createGenerateClassName
} from '@material-ui/core/styles';

const generateClassName = createGenerateClassName({
  seed: 'app1'
});

const App = () => {
 return (
    <StylesProvider generateClassName={generateClassName}>
       <OtherAppComponents />
    </StylesProvider>
)
}

To avoid conflicts, ensure each component has its own provider and generator by using different seeds for each.

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