@sanity/code-input

This is a Sanity Studio v3 plugin. For the v2 version, please refer to the v2-branch.

What is it?

Code input for Sanity.

A subset of languages and features are exposed by default. More can be added via the plugin options.

Click the line numbers to toggle line highlighting.

Installation

npm install @sanity/code-input

Usage

Add it as a plugin in sanity.config.ts (or .js):

import {codeInput} from '@sanity/code-input'

export default defineConfig({
  // ...
  plugins: [codeInput()],
})

Now you can use the code type in your schema types:

import {defineType, defineField} from 'sanity'

defineType({
  // [...]
  fields: [
    defineField({
      type: 'code',
      name: 'myCodeField',
      title: 'My code field',
    }),
  ],
})

Options

• language - Default language for this code field.
• languageAlternatives - Array of languages that should be available (se its format in the example below)
• withFilename - Boolean option to display input field for filename

//...fields,
defineField({
  type: 'code',
  name: 'myCodeField',
  title: 'Code with all options',
  options: {
    language: 'javascript',
    languageAlternatives: [
      {title: 'Javascript', value: 'javascript'},
      {title: 'HTML', value: 'html'},
      {title: 'CSS', value: 'css'},
    ],
    withFilename: true,
  },
})

Add support for more languages

Only a subset of languages are have syntax highlighting support by default (see full list here).

Mode: Reuse an existing language

Some languages are similar enough, that reusing one of the default highlighters will be "good enough". To reuse an existing language, specify mode for a value in languageAlternatives:

//...fields,
defineField({
  name: 'zhOnly',
  type: 'code',
  options: {
    language: 'zh',
    languageAlternatives: [
      //Adds support for zh language, using sh syntax highlighting
      {title: 'ZH', value: 'zh', mode: 'sh'},
    ],
  },
})

Add more languages

You can add support for additional languages, or override existing ones, by providing a codeModes array to the plugin. codeModes should be an array where each value is an object with a name and a loader function. The loader function should return a codemirror Extension or a Promise that resolves to Extension.

The loader function will be invoked when the language is selected.

For a full list of officialy code-mirror languages, see:

Example: Add support for CodeMirror 6 language (Angular)

We can add support for a CodeMirror 6 lang package:

// sanity.config.js

// ... in the plugins array of defineConfig, where we add the codeInput plugin
codeInput({
  codeModes: [
    {
      name: 'angular',
      // dynamic import the angular package, and initialize the plugin after it is loaded
      // This way, the language is only when it is selected
      loader: () => import('@codemirror/lang-angular').then(({angular}) => angular()),
    },
  ],
})

// in a code field, you can now use rust as a language as a value, or mode
defineField({
  name: 'exampleRust',
  title: 'Example usage',
  type: 'code',
  options: {
    languageAlternatives: [
      {title: 'Javascript', value: 'javascript'},
      {title: 'Angular', value: 'angular'},
      {title: 'Angular-like', value: 'angular-like', mode: 'angular'}, // uses angular highlighter
    ],
  },
})

For this to work, you will have to run npm i @codemirror/lang-angular as this package is not included by @sanity/code-input.

Example: Add support for CodeMirror 5 legacy language (Rust)

We can add support for any CodeMirror 5 legacy language using CodeMirror 6 StreamLanguage.

// sanity.config.js
import {StreamLanguage} from '@codemirror/language'

// ... in the plugins array of defineConfig, where we add the codeInput plugin
codeInput({
  codeModes: [
    {
      name: 'rust',
      // dynamic import so the language is only be loaded on demand
      loader: () =>
        import('@codemirror/legacy-modes/mode/rust').then(({rust}) => StreamLanguage.define(rust)),
    },
  ],
})

// in a code field, you can now use rust as a language as a value, or mode
defineField({
  name: 'exampleRust',
  title: 'Example usage',
  type: 'code',
  options: {
    languageAlternatives: [
      {title: 'Javascript', value: 'javascript'},
      {title: 'Rust', value: 'rust'},
      {title: 'Rust-like', value: 'rust-like', mode: 'rust'}, // uses rust highlighter
    ],
  },
})

Note: @sanity/code-input already includes the @codemirror/legacy-modes and @codemirror/language dependencies, so no need to install them explicitly.

Data model

{
  _type: 'code',
  language: 'js',
  highlightedLines: [1, 2],
  code: 'const foo = "bar"\nconsole.log(foo.toUpperCase())\n// BAR',
  filename: 'available when enabled'
}

Example usage in frontend (React)

You can use any syntax highlighter you want - but not all of them might support highlighted lines or the syntax you've defined.

As outlined above, the actual code is stored in a code property, so if your schema has a field called codeExample of type code, the property you'd want to pass to the highlighter would be codeExample.code.

Here's an example using react-refractor:

import React from 'react'
import Refractor from 'react-refractor'
import js from 'refractor/lang/javascript'

Refractor.registerLanguage(js)

export function Code(props) {
  return (
    <Refractor
      // In this example, `props` is the value of a `code` field
      language={props.language}
      value={props.code}
      markers={props.highlightedLines}
    />
  )
}

Other syntax highlighters include:

• react-lowlight
• react-syntax-highlighter
• highlight.js
• prism

License

MIT-licensed. See LICENSE.

Develop & test

This plugin uses @sanity/plugin-kit with default configuration for build & watch scripts.

See Testing a plugin in Sanity Studio on how to run this plugin with hotreload in the studio.

UI Workshop

Run workshop dev

To test the CodeMirror lazy component.

Release new version

Run "CI & Release" workflow. Make sure to select the main branch and check "Release new version".

Semantic release will only release on configured branches, so it is safe to run release on any branch.