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Step 1: Install Required Packages

You need to install the necessary packages:

npm install gatsby-plugin-theme-ui theme-ui prism-react-renderer

Step 2: Create a gatsby-plugin-theme-ui Configuration

In your Gatsby project's root directory, create a gatsby-plugin-theme-ui configuration file. You can create a theme.js file for this purpose.

// src/gatsby-plugin-theme-ui/theme.js

import prism from '@theme-ui/prism/presets/theme-ui';

const theme = {
  // Your other theme settings here...

  // Extend the base theme with Prism theme settings
  styles: {
    ...prism,
  },
};

export default theme;

In this example, we're importing the Prism theme settings from @theme-ui/prism/presets/theme-ui and extending the base theme with these settings.

Step 3: Configure the gatsby-config.js File

In your gatsby-config.js file, add the gatsby-plugin-theme-ui plugin to your plugins array. Make sure it's placed before other plugins, especially those that modify the Markdown rendering pipeline.

// gatsby-config.js

module.exports = {
  plugins: [
    // Other plugins...

    'gatsby-plugin-theme-ui', // Add this line
  ],
};

Step 4: Use Prism for Syntax Highlighting

In your Markdown or MDX files, you can now use triple backticks (```) to create code blocks, and Prism will be applied automatically with the theme you defined.

```jsx
import React from 'react';

const MyComponent = () => {
  return <div>Hello, World!</div>;
};

export default MyComponent;
```


The code block above will be syntax-highlighted using Prism with the theme you configured in `gatsby-plugin-theme-ui`.

**Step 5: Customize the Prism Theme (Optional)**

If you want to customize the Prism theme, you can do so by overriding the `prism` object in your `theme.js` file (created in Step 2). Modify the colors, fonts, or any other Prism-specific settings to match your project's design.

With these steps, you'll have integrated Prism for syntax highlighting into your Gatsby project using the `gatsby-plugin-theme-ui` package and can easily customize its appearance to fit your project's theme.

gah-code/gatsby-mdx-project-01

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