CodeHighlight

Highlight code with highlight.js

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Docs

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Package

@mantine/code-highlight

License

MIT

Installation

yarn add @mantine/code-highlight

After installation import package styles at the root of your application:

import '@mantine/code-highlight/styles.css';

Example

CodeHighlight component is used to display code snippets with syntax highlighting. It provides a flexible adapter system that allows using any code highlighting library of your choice.

Example of code highlighting with shiki:

type FilterPropsRes<T extends Record<string, any>> = {
  [Key in keyof T]-?: T[Key] extends undefined ? never : T[Key];
};

export function filterProps<T extends Record<string, any>>(props: T) {
  return Object.keys(props).reduce<FilterPropsRes<T>>((acc, key: keyof T) => {
    if (props[key] !== undefined) {
      acc[key] = props[key];
    }
    return acc;
  }, {} as FilterPropsRes<T>);
}

import { CodeHighlight } from '@mantine/code-highlight';

const exampleCode = `
type FilterPropsRes<T extends Record<string, any>> = {
  [Key in keyof T]-?: T[Key] extends undefined ? never : T[Key];
};

export function filterProps<T extends Record<string, any>>(props: T) {
  return Object.keys(props).reduce<FilterPropsRes<T>>((acc, key: keyof T) => {
    if (props[key] !== undefined) {
      acc[key] = props[key];
    }
    return acc;
  }, {} as FilterPropsRes<T>);
}
`;

function Demo() {
  return <CodeHighlight code={exampleCode} language="tsx" radius="md" />;
}

Adapters

@mantine/code-highlight package does not depend on any specific code highlighting library. You can choose one of the default adapters provided by the package or create your own.

Default adapters:

createShikiAdapter – creates shiki adapter
createHighlightJsAdapter – creates highlight.js adapter
plainTextAdapter – does not highlight code, just displays it as plain text (used by default if no adapter provided)

Shiki library provides the most advanced syntax highlighting for TypeScript and CSS/Sass code. It uses textmate grammars to highlight code (same as in VSCode). Shiki adapter is recommended if you need to highlight advanced TypeScript (generics, jsx nested in props) or CSS code (custom syntaxes, newest features). Shiki adapter is used for all code highlighting in Mantine documentation.

To use shiki adapter you need to install shiki package:

yarn add shiki

Then wrap your app with CodeHighlightAdapterProvider and provide createShikiAdapter as adapter prop:

import { MantineProvider } from '@mantine/core';
import { CodeHighlightAdapterProvider, createShikiAdapter } from '@mantine/code-highlight';

// Shiki requires async code to load the highlighter
async function loadShiki() {
  const { createHighlighter } = await import('shiki');
  const shiki = await createHighlighter({
    langs: ['tsx', 'scss', 'html', 'bash', 'json'],
    themes: [],
  });

  return shiki;
}

const shikiAdapter = createShikiAdapter(loadShiki);

function App() {
  return (
    <MantineProvider>
      <CodeHighlightAdapterProvider adapter={shikiAdapter}>
        {/* Your app here */}
      </CodeHighlightAdapterProvider>
    </MantineProvider>
  );
}

After that, you can use CodeHighlight component in your application:

type FilterPropsRes<T extends Record<string, any>> = {
  [Key in keyof T]-?: T[Key] extends undefined ? never : T[Key];
};

export function filterProps<T extends Record<string, any>>(props: T) {
  return Object.keys(props).reduce<FilterPropsRes<T>>((acc, key: keyof T) => {
    if (props[key] !== undefined) {
      acc[key] = props[key];
    }
    return acc;
  }, {} as FilterPropsRes<T>);
}

import { CodeHighlight } from '@mantine/code-highlight';

const exampleCode = `
type FilterPropsRes<T extends Record<string, any>> = {
  [Key in keyof T]-?: T[Key] extends undefined ? never : T[Key];
};

export function filterProps<T extends Record<string, any>>(props: T) {
  return Object.keys(props).reduce<FilterPropsRes<T>>((acc, key: keyof T) => {
    if (props[key] !== undefined) {
      acc[key] = props[key];
    }
    return acc;
  }, {} as FilterPropsRes<T>);
}
`;

function Demo() {
  return <CodeHighlight code={exampleCode} language="tsx" radius="md" />;
}

All further code highlighting examples on this page are using shiki adapter.

Usage with highlight.js

Highlight.js provides less accurate highlighting compared to shiki, but it has smaller bundle size and better performance. Choose highlight.js adapter if you need to highlight basic JavaScript, HTML, and CSS code.

To use highlight.js adapter you need to install highlight.js package:

yarn add highlight.js

Then wrap your app with CodeHighlightAdapterProvider and provide createHighlightJsAdapter as adapter prop:

import { MantineProvider } from '@mantine/core';
import { CodeHighlightAdapterProvider, createHighlightJsAdapter } from '@mantine/code-highlight';
import hljs from 'highlight.js/lib/core';
import tsLang from 'highlight.js/lib/languages/typescript';

hljs.registerLanguage('typescript', tsLang);

const highlightJsAdapter = createHighlightJsAdapter(hljs);

function App() {
  return (
    <MantineProvider>
      <CodeHighlightAdapterProvider adapter={highlightJsAdapter}>
        {/* Your app here */}
      </CodeHighlightAdapterProvider>
    </MantineProvider>
  );
}

Then you need to add styles of one of the highlight.js themes to your application. You can do that by importing css file from highlight.js package or adding it via CDN link to the head of your application:

<link
  rel="stylesheet"
  href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/atom-one-dark.min.css"
/>

After that, you can use CodeHighlight component in your application.

Create custom adapter

You can create a custom adapter if you want to enhance the default behavior of the code highlighting or use a different library.

Example of creating a custom shiki adapter with custom themes and logic:

import type { CodeHighlightAdapter, stripShikiCodeBlocks } from '@mantine/code-highlight';

// Shiki transformers can be used to highlight diffs and other notations
// https://shiki.style/packages/transformers
import { transformerNotationDiff, transformerNotationHighlight } from '@shikijs/transformers'

// Shiki themes as objects, you can use any VSCode themes
import { darkTheme, lightTheme } from './shiki-themes';

async function loadShiki() {
  const { createHighlighter } = await import('shiki');
  const shiki = await createHighlighter({
    langs: ['tsx', 'scss', 'html', 'bash', 'json'],
    themes: [],
  });

  return shiki;
}

// Pass this adapter to CodeHighlightAdapterProvider component
export const customShikiAdapter: CodeHighlightAdapter = {
  // loadContext is called on client side to load shiki highlighter
  // It is required to be used if your library requires async initialization
  // The value returned from loadContext is passed to createHighlighter as ctx argument
  loadContext: loadShiki,

  // ctx is the value returned from loadContext
  // or null if loadContext is not used or has not resolved yet
  createHighlighter: (ctx) => {
    if (!ctx) {
      return ({ code }) => ({ highlightedCode: code, isHighlighted: false });
    }

    return ({ code, language, colorScheme }) => ({
      isHighlighted: true,
      // stripShikiCodeBlocks removes <pre> and <code> tags from highlighted code
      highlightedCode: stripShikiCodeBlocks(
        ctx.codeToHtml(code, {
          lang: language,
          theme: (colorScheme === 'light' ? lightTheme : darkTheme) as any,
          transformers: [transformerNotationDiff(), transformerNotationHighlight()],
        })
      ),
    });
  },
};

Copy button

You can customize copy button labels with copyLabel and copiedLabel props. In case you need to remove the copy button, set withCopyButton={false}.

// Custom copy label
function Button() {
  return <button>Click me</button>;
}

// Without copy button
function Button() {
  return <button>Click me</button>;
}

import { CodeHighlight } from '@mantine/code-highlight';

const exampleCode = `
function Button() {
  return <button>Click me</button>;
}
`;

function Demo() {
  return (
    <>
      <CodeHighlight
        code={`// Custom copy label${exampleCode}`}
        language="tsx"
        copyLabel="Copy button code"
        copiedLabel="Copied!"
        radius="md"
      />
      <CodeHighlight
        code={`// Without copy button${exampleCode}`}
        language="tsx"
        withCopyButton={false}
        mt="md"
        radius="md"
      />
    </>
  );
}

With tabs

CodeHighlightTabs component allows organizing multiple code blocks into tabs:

import { Group, Button, MantineProvider, createTheme } from '@mantine/core';
import classes from './Demo.module.css';

const theme = createTheme({
  components: {
    Button: Button.extend({
      classNames: classes,
    }),
  },
});

function Demo() {
  return (
    <MantineProvider theme={theme}>
      <Group>
        <Button variant="danger">Danger variant</Button>
        <Button variant="primary">Primary variant</Button>
      </Group>
    </MantineProvider>
  );
}

import { CodeHighlightTabs } from '@mantine/code-highlight';
import { tsxCode, cssCode } from './code';

function Demo() {
  return (
    <CodeHighlightTabs
      radius="md"
      code={[
        { fileName: 'Demo.tsx', code: tsxCode, language: 'tsx' },
        { fileName: 'Demo.module.css', code: cssCode, language: 'scss' },
      ]}
    />
  );
}

Tabs with icons

You can use any React node as tab icon. The example below uses TypeScript and CSS icons from the @mantinex/dev-icons package, but you can use any other icons library or custom icons:

function Button() {
  return <button>Click me</button>;
}

import { CodeHighlightTabs } from '@mantine/code-highlight';
import { TypeScriptIcon, CssIcon } from '@mantinex/dev-icons';

const tsxCode = `
function Button() {
  return <button>Click me</button>;
}
`;

const cssCode = `
.button {
  background-color: transparent;
  color: var(--mantine-color-blue-9);
}
`;

function Demo() {
  const tsIcon = <TypeScriptIcon size={14} />;
  const cssIcon = <CssIcon size={14} />;

  return (
    <CodeHighlightTabs
      radius="md"
      code={[
        {
          fileName: 'Button.tsx',
          code: tsxCode,
          language: 'tsx',
          icon: tsIcon,
        },
        {
          fileName: 'Button.module.css',
          code: cssCode,
          language: 'scss',
          icon: cssIcon,
        },
      ]}
    />
  );
}

Tabs icons based on file name

As an alternative to providing icons manually for each tab, you can use getFileIcon prop to assign icons based on file name. getFileIcon accepts file name and must React node or null.

function Button() {
  return <button>Click me</button>;
}

import { CodeHighlightTabs } from '@mantine/code-highlight';
import { TypeScriptIcon, CssIcon } from '@mantinex/dev-icons';

const tsxCode = `
function Button() {
  return <button>Click me</button>;
}
`;

const cssCode = `
.button {
  background-color: transparent;
  color: var(--mantine-color-blue-9);
}
`;

function getFileIcon(fileName: string) {
  if (fileName.endsWith('.ts') || fileName.endsWith('.tsx')) {
    return <TypeScriptIcon size={14} />;
  }

  if (fileName.endsWith('.css')) {
    return <CssIcon size={14} />;
  }

  return null;
}

function Demo() {
  return (
    <CodeHighlightTabs
      getFileIcon={getFileIcon}
      radius="md"
      code={[
        {
          fileName: 'Button.tsx',
          code: tsxCode,
          language: 'tsx',
        },
        {
          fileName: 'Button.module.css',
          code: cssCode,
          language: 'scss',
        },
      ]}
    />
  );
}

Expandable code

If the code snippet is too long, you can make it expandable with withExpandButton and defaultExpanded={false} props. To change label of the expand/collapse control tooltip, use expandCodeLabel and collapseCodeLabel.

import { Group, Button, MantineProvider, createTheme } from '@mantine/core';
import classes from './Demo.module.css';

const theme = createTheme({
  components: {
    Button: Button.extend({
      classNames: classes,
    }),
  },
});

function Demo() {
  return (
    <MantineProvider theme={theme}>
      <Group>
        <Button variant="danger">Danger variant</Button>
        <Button variant="primary">Primary variant</Button>
      </Group>
    </MantineProvider>
  );
}

import { CodeHighlightTabs } from '@mantine/code-highlight';
import { tsxCode, cssCode } from './code';

function Demo() {
  return (
    <CodeHighlightTabs
      withExpandButton
      defaultExpanded={false}
      expandLabel="Show full code"
      collapseLabel="Show less"
      code={[
        { fileName: 'Demo.tsx', code: tsxCode, language: 'tsx' },
        { fileName: 'Demo.module.css', code: cssCode, language: 'scss' },
      ]}
    />
  );
}

Custom controls

Use controls prop with CodeHighlightControl component to add custom controls to the code block:

function greet() {
  return 'Hello, World!';
}

import { IconBrandCodesandbox, IconMessage2 } from '@tabler/icons-react';
import { CodeHighlight, CodeHighlightControl } from '@mantine/code-highlight';

const exampleCode = `
function greet() {
  return 'Hello, World!';
}
`;

function Demo() {
  return (
    <CodeHighlight
      code={exampleCode}
      language="tsx"
      radius="md"
      controls={[
        <CodeHighlightControl
          component="a"
          href="https://codesandbox.io"
          target="_blank"
          tooltipLabel="Open on codesandbox"
          key="sandbox"
        >
          <IconBrandCodesandbox />
        </CodeHighlightControl>,
        <CodeHighlightControl tooltipLabel="Discuss with GPT" key="gpt">
          <IconMessage2 />
        </CodeHighlightControl>,
      ]}
    />
  );
}

Inline code

InlineCodeHighlight component allows highlighting inline code snippets:

You can highlight code inline: <InlineCodeHighlight code="" language="tsx" />. Is that not cool?

import { Text } from '@mantine/core';
import { InlineCodeHighlight } from '@mantine/code-highlight';

function Demo() {
  return (
    <Text>
      You can highlight code inline:{' '}
      <InlineCodeHighlight
        code='<InlineCodeHighlight code="" language="tsx" />'
        language="tsx"
        withBorder
      />
      . Is that not cool?
    </Text>
  );
}

Heatmap

Notifications system