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      • CodeBlockRuntime non-ejectable

      Warning

      This component currently does not support copying source code via the eject command. Custom Theme

      CodeBlockRuntime renders runnable code blocks at runtime.

      Usage

      index.mdx
      import { CodeBlockRuntime } from '@rspress/core/theme';

export default function Page() {
  return (
    <CodeBlockRuntime
      lang="js"
      title="index.js"
      code={`console.log('Hello World!')`}
      shikiOptions={{}}
    />
  );
}
      index.js
      console.log('Hello World!')

      Pass lang, title, and code to render the block; shikiOptions customizes highlighting and also supports transformers.

      Warning

      Use CodeBlockRuntime only when necessary. It increases runtime bundle size, especially when multiple languages are included, and cannot benefit from compile-time highlighting.

      Using shiki options

      Here is an example using a transformer for line highlighting:

      foo.mdx
      import { CodeBlockRuntime } from '@rspress/core/theme';
import { transformerNotationHighlight } from '@shikijs/transformers';

<CodeBlockRuntime
  lang="ts"
  title="highlight.ts"
  code={`console.log('Highlighted'); // [!code highlight]
// [!code highlight:1]
console.log('Highlighted');
console.log('Not highlighted');`}
  shikiOptions={{
    transformers: [transformerNotationHighlight()],
  }}
/>
      highlight.ts
      console.log('Highlighted'); // [!code highlight]
// [!code highlight:1]
console.log('Highlighted');
console.log('Not highlighted');

      Importing file content

      You can use the ?raw query to import file content as a string and pass it to the code prop. See Rsbuild - Static Assets for details.

      foo.mdx
      import { CodeBlockRuntime } from '@rspress/core/theme';
import codeContent from './example.ts?raw';

<CodeBlockRuntime lang="ts" title="example.ts" code={codeContent} />

      This approach is suitable for scenarios where you need to dynamically display external file content, such as showing example code files.

      Warning

      If you only need to reference external files as code blocks, use the static file code block syntax. It is processed at compile time, with better performance and a smaller bundle size.