# MUI Global styleOverrides

TSS Support [MUI Global style overrides from `createTheme`](https://mui.com/customization/theme-components/%23global-style-overrides)  out of the box.  Previously in material-ui v4 it was: [global theme overrides](https://v4.mui.com/customization/components/#global-theme-override).

By default, however, only the `theme` object is passed to the callbacks, if you want to pass the correct `props`, and a specific `ownerState` have a look at the following example:  

{% tabs %}
{% tab title="Modern API" %}
{% code title="MyComponent.tsx" %}

```tsx
import { tss } from "tss-react/mui";

export type Props = {
    className?: string;
    classes?: Partial<ReturnType<typeof useStyles>["classes"]>;
    lightBulbBorderColor: string;
}

function MyComponent(props: Props) {

    const { className } = props;

    const [isOn, toggleIsOn] = useReducer(isOn => !isOn, false);

    const { classes, cx } = useStyles({ 
        muiStyleOverridesParams: { 
            props, 
            "ownerState": { isOn } 
        }
    });

    return (
        <div className={cx(classes.root, className)} >
            <div className={classes.lightBulb}></div>
            <button onClick={toggleIsOn}>{`Turn ${isOn?"off":"on"}`}</button>
            <p>Div should have a border, background should be white</p>
            <p>Light bulb should have black border, it should be yellow when turned on.</p>
        </div>
    );

}

const useStyles = tss
    .withName("MyComponent")
    .create({
        root: {
            border: "1px solid black",
            width: 500,
            height: 200,
            position: "relative",
            color: "black"
        },
        lightBulb: {
            position: "absolute",
            width: 50,
            height: 50,
            top: 120,
            left: 500/2 - 50,
            borderRadius: "50%"
        }
    });
```

{% endcode %}
{% endtab %}

{% tab title="makeStyles API" %}

```tsx
export type Props = {
    className?: string;
    classes?: Partial<ReturnType<typeof useStyles>["classes"]>;
    lightBulbBorderColor: string;
}

function MyComponent(props: Props) {

    const { className } = props;

    const [isOn, toggleIsOn] = useReducer(isOn => !isOn, false);

    const { classes, cx } = useStyles(undefined, { props, "ownerState": { isOn } });

    return (
        <div className={cx(classes.root, className)} >
            <div className={classes.lightBulb}></div>
            <button onClick={toggleIsOn}>{`Turn ${isOn?"off":"on"}`}</button>
            <p>Div should have a border, background should be white</p>
            <p>Light bulb should have black border, it should be yellow when turned on.</p>
        </div>
    );

}

const useStyles = makeStyles({ name: "MyComponent" })({
    "root": {
        "border": "1px solid black",
        "width": 500,
        "height": 200,
        "position": "relative",
        "color": "black"
    },
    "lightBulb": {
        "position": "absolute",
        "width": 50,
        "height": 50,
        "top": 120,
        "left": 500/2 - 50,
        "borderRadius": "50%"
    }
});
```

{% endtab %}
{% endtabs %}

Declaration of the theme: &#x20;

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

const theme = createTheme({
    components: {
        //@ts-ignore: It's up to you to define the types for your library
        MyComponent: {
            styleOverrides: {
                lightBulb: ({ theme, ownerState: { isOn }, lightBulbBorderColor })=>({
                    border: `1px solid ${lightBulbBorderColor}`,
		    backgroundColor: isOn ? theme.palette.info.main : "grey"
                })
            }		
        }
    }
});

render(
    <MuiThemeProvider theme={theme}>
    {/*...*/}
    </MuiThemeProvider>
);
```

Usage of the component: &#x20;

```tsx

import { useStyles } from "tss-react/mui";

function App(){
    const { css } = useStyles();
    return (
        <MyComponent 
            className={css({ "backgroundColor": "white" })}
            classes={{
                root: css({
                    backgroundColor: "red",
                    border: "1px solid black"
                })
            }}
            lightBulbBorderColor="black"
        />
    );
}
```

Result: &#x20;

![](https://user-images.githubusercontent.com/6702424/159143760-85f2c42d-602d-4aad-a3f0-9338ff6e8c76.gif)

You can see the code [here](https://github.com/garronej/tss-react/tree/main/src/test/apps/spa) and it's live [here](https://www.tss-react.dev/test/) (near the bottom of the page). &#x20;


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