vue-codemirror6

A component for using CodeMirror6 with Vue. This component works in both Vue2 and Vue3.

• CHANGELOG

Usage

yarn add vue-codemirror6 codemirror

For Vue 2.7 or below, @vue/composition-api is required separately.

yarn add vue-codemirror6 @vue/composition-api

This component can handle bidirectional binding by v-model like a general Vue component.

Props

Props	Type	Information
model-value	string | Text	Text value. (Not value)
basic	boolean	Use basicSetup.
minimal	boolean	Use miniSetup. If a basic prop is also specified, that setting will take precedence.
dark	boolean	Toggle Darkmode.
placeholder	string	Add placeholder text (or HTML DOM) when blank
wrap	boolean	Line text wrapping. see lineWrapping.
tab	boolean	Enables tab indentation.
allow-multiple-selections	boolean	Allow Multiple Selection. See allowMultipleSelections
tab-size	number	Configures the tab size to use in this state.
line-separator	string	Set line break (separetor) char. (Default is \n.)
theme	{ [selector: string]: StyleSpec }	Specify the theme. For example, if you use @codemirror/theme-one-dark, import oneDark and put it in this prop.
readonly	boolean	Makes the cursor visible or you can drag the text but not edit the value.
disabled	boolean	This is the reversed value of the CodeMirror editable. Similar to readonly, but setting this value to true disables dragging.
lang	LanguageSupport	The language you want to have syntax highlighting. see https://codemirror.net/6/#languages
phrases	Record<string, string>	Specify here if you want to make the displayed character string multilingual. see https://codemirror.net/6/examples/translate/
extensions	Extension[]	Includes enhancements to extend CodeMirror.
linter	LintSource	Set Linter. Enter a linter (eg esLint([arbitrary rule]) function for @codemirror/lang-javascript, jsonParseLinter()function for@codemirror/json). See the sources for various language libraries for more information.
linterConfig	Object	see https://codemirror.net/docs/ref/#lint.linter^config
forceLinting	boolean	see https://codemirror.net/docs/ref/#lint.forceLinting
gutter	boolean	Display 🔴 on the line where there was an error when linter was specified. It will not work if linter is not specified.
gutterConfig	Object	see https://codemirror.net/docs/ref/#lint.lintGutter^config
tag	string	HTML tags used in the component. (Default is div tag.)
scrollIntoView	boolean	Allows an external update to scroll the form. (Default is true)
keymap	KeyBinding[]	Key bindings associate key names with command-style functions. See https://codemirror.net/docs/ref/#view.KeyBinding

⚠ Notice: lang and linter can also be set together in extensions. These are separated for compatibility with previous versions of CodeMirror settings and for typing props.

Supported Languages

Official

• @codemirror/lang-angular
• @codemirror/lang-cpp
• @codemirror/lang-css
• @codemirror/lang-html
• @codemirror/lang-java
• @codemirror/lang-javascript
• @codemirror/lang-json
• @codemirror/lang-lezer
• @codemirror/lang-markdown
• @codemirror/lang-php
• @codemirror/lang-python
• @codemirror/lang-rust
• @codemirror/lang-sql
• @codemirror/lang-vue
• @codemirror/lang-west
• @codemirror/lang-xml

Unofficial

• @phoenix-plugin-registry/petetnt.brackets-codemirror-fortran
• @phoenix-plugin-registry/petetnt.brackets-codemirror-go
• @acarl005/lang-sql
• @ark-us/codemirror-lang-taylor
• @formulavize/lang-fiz
• @gravitywiz/codemirror-lang-gfcalc
• @nextjournal/lang-clojure
• @plutojl/lang-julia
• @polybase/codemirror-lang-javascript -@replit/codemirror-lang-nix
• @replit/codemirror-lang-csharp
• @replit/codemirror-lang-solidity
• @replit/codemirror-lang-svelte
• @zhijiu/lang-sql
• codemirror-lang-bool
• codemirror-lang-brainfuck
• codemirror-lang-cherry
• codemirror-lang-chordpro
• codemirror-lang-circom
• codemirror-lang-edn
• codemirror-lang-ejs
• codemirror-lang-fsl
• codemirror-lang-gml
• codemirror-lang-golfscript
• codemirror-lang-homescript
• codemirror-lang-html-n8n
• codemirror-lang-inform7
• codemirror-lang-j
• codemirror-lang-janet
• codemirror-lang-k
• codemirror-lang-karol
• codemirror-lang-mermaid
• codemirror-lang-n8n-expression
• codemirror-lang-prolog
• codemirror-lang-qpen
• codemirror-lang-qtam
• codemirror-lang-r
• codemirror-lang-rome-ast
• codemirror-lang-rome
• codemirror-lang-rush
• codemirror-lang-scopescript
• codemirror-lang-statement
• gcode-lang-codemirror
• gmail-lang
• lang-bqn
• lang-clojure
• lang-d
• lang-feel
• lang-firestore

Supported Themes

• @codemirror/theme-one-dark
• upleveled/theme-vs-code-dark-plus
• codemirror6-bootstrap-theme

Example

Mark up as follows to make it work at a minimum.

<template>
  <code-mirror v-model="value" />
</template>

<script>
import { ref, defineComponent } from 'vue';

import CodeMirror from 'vue-codemirror6';

export default defineComponent({
  components: {
    CodeMirror,
  },
  setup() {
    const value = ref('Cozy lummox gives smart squid who asks for job pen.');

    return { value };
  },
});
</script>

Example using Slots

The contents of the slot will overwrite the existing v-model. For this reason, it is recommended to use it when simply displaying with a readonly prop without using v-model.

Also, insert a <pre> tag to prevent the text in the slot from being automatically formatted.

<template>
  <code-mirror :lang="lang" :linter="linter">
    <pre>
{
  "key": "value"
}</pre
    >
  </code-mirror>
</template>

<script>
import { ref, defineComponent } from 'vue';

import { json, jsonParseLinter } from '@codemirror/lang-json';

import CodeMirror from 'vue-codemirror6';

export default defineComponent({
  components: {
    CodeMirror,
  },
  setup() {
    const lang = json();
    const linter = jsonParseLinter();
    return { lang, linter };
  },
});
</script>

Using with SSR (Nuxt.js, etc.)

This component is now SSR-compatible. CodeMirror will only be initialized on the client side, and the component will safely render without errors during server-side rendering.

If you're using Nuxt 3, you can use the component directly:

<template>
  <code-mirror v-model="value" :lang="lang" />
</template>

<script setup lang="ts">
import { ref } from 'vue';
import CodeMirror from 'vue-codemirror6';
import { javascript } from '@codemirror/lang-javascript';

const value = ref('console.log("Hello, World!");');
const lang = javascript();
</script>

For Nuxt 2 or if you encounter any issues, you can wrap the component with <ClientOnly>:

<template>
  <client-only>
    <code-mirror v-model="value" :lang="lang" />
  </client-only>
</template>

Full Example

When using as a Markdown editor on vite-vue3-ts-starter.

<script lang="ts" setup>
import { ref, defineComponent, type Ref } from 'vue';

// Load component
import CodeMirror from 'vue-codemirror6';

// CodeMirror extensions
import { markdown as md } from '@codemirror/lang-markdown';
import type { LanguageSupport } from '@codemirror/language';
import type { Extension } from '@codemirror/state';
import type { ViewUpdate } from '@codemirror/view';

/** text */
const value: Ref<string> = ref('');

/** Dark mode **/
const dark: Ref<boolean> = ref(
  window.matchMedia('(prefers-color-scheme: dark)').matches
);

/**
 * CodeMirror Language
 *
 * @see {@link https://codemirror.net/6/docs/ref/#language | @codemirror/language}
 */
const lang: LanguageSupport = md();

/**
 * Internationalization Config.
 * In this example, the display language to Japanese.
 * Must be reactive when used in combination with vue-i18n.
 *
 * @see {@link https://codemirror.net/6/examples/translate/ | Example: Internationalization}
 */
const phrases: Record<string, string> = {
  // @codemirror/view
  'Control character': '制御文字',
  // @codemirror/commands
  'Selection deleted': '選択を削除',
  // @codemirror/language
  'Folded lines': '折り畳まれた行',
  'Unfolded lines': '折り畳める行',
  to: '行き先',
  'folded code': '折り畳まれたコード',
  unfold: '折り畳みを解除',
  'Fold line': '行を折り畳む',
  'Unfold line': '行の折り畳む解除',
  // @codemirror/search
  'Go to line': '行き先の行',
  go: 'OK',
  Find: '検索',
  Replace: '置き換え',
  next: '▼',
  previous: '▲',
  all: 'すべて',
  'match case': '一致条件',
  'by word': '全文検索',
  regexp: '正規表現',
  replace: '置き換え',
  'replace all': 'すべてを置き換え',
  close: '閉じる',
  'current match': '現在の一致',
  'replaced $ matches': '$ 件の一致を置き換え',
  'replaced match on line $': '$ 行の一致を置き換え',
  'on line': 'した行',
  // @codemirror/autocomplete
  Completions: '自動補完',
  // @codemirror/lint
  Diagnostics: 'エラー',
  'No diagnostics': 'エラーなし',
};
</script>

<template>
  <code-mirror
    v-model="value"
    basic
    :dark="dark"
    :lang="lang"
    :phrases="phrases"
  />
</template>

Events

Event	Description
ready	When CodeMirror loaded.
focus	When focus changed.
update	When CodeMirror state changed. Returns ViewUpdate object.
change	Value changed. Returns EditorState

Parameter / Function

<script setup lang="ts">
import { ref, onMounted, type Ref, type PropType } from 'vue';
import CodeMirror from 'vue-codemirror6';

const cm: Ref<InstanceType<typeof CodeMirror> | undefined> = ref();

onMounted(() => {
  console.log(cm.value?.json);
});
</script>
<template>
  <code-mirror ref="cm" />
</template>

Function / Parameter	Description
view	Get and set EditorView.
selection	Get and set the EditorSelection instance.
cursor	Get and set the cursor location.
json	Get and set state to a JSON-serializable object.
focus	Get and set focus.
lint()	Force run linter (Only if linter prop is specified)
forceReconfigure()	Re register all extensions.

CodeMirror5 backward compatible functions

The instructions below are compatible methods for those familiar with codemirror5. Since the above method is usually sufficient, its active use is not recommended.

Function	Description
getRange(from?: number, to?: number)	Get the text between the given points in the editor.
getLine(number: number)	Get the content of line.
lineCount()	Get the number of lines in the editor.
getCursor()	Retrieve one end of the primary selection.
listSelections()	Retrieves a list of all current selections.
getSelection()	Get the currently selected code.
getSelections()	The length of the given array should be the same as the number of active selections.
somethingSelected()	Return true if any text is selected.
replaceRange(replacement: string | Text, from: number, to: number)	Replace the part of the document between from and to with the given string.
replaceSelection(replacement: string | Text)	Replace the selection(s) with the given string.
setCursor(position: number)	Set the cursor position.
setSelection(anchor: number, head?: number)	Set a single selection range.
setSelections(ranges: readonly SelectionRange[], primary?: number)	Sets a new set of selections.
extendSelectionsBy(f: Function)	Applies the given function to all existing selections, and calls extendSelections on the result.

Recommendations

Since CodeMirror has a relatively large capacity, when using vite, it is recommended to set it to output as a separate file using the manualChunks option at build time as shown below.

const config: UserConfig = {
  // ...
  build: {
    rollupOptions: {
      output: {
        manualChunks: {
          // ...
          codemirror: ['vue-codemirror6'],
          'codemirror-lang': [
            // Add the following as needed.
            '@codemirror/lang-html',
            '@codemirror/lang-javascript',
            '@codemirror/lang-markdown',
          ],
          // ...
        },
      },
    },
  },
  // ...
};

Development

Testing

This project uses Vitest for unit testing.

# Run tests
pnpm test

# Run tests in watch mode
pnpm test:watch

# Run tests with UI
pnpm test:ui

# Run tests with coverage
pnpm test:coverage

The test suite includes:

• Component Tests: Testing basic rendering, props, events, and v-model binding
• SSR Tests: Ensuring proper server-side rendering compatibility for Nuxt.js and other SSR frameworks
• Method Tests: Verifying all exposed methods work correctly
• Edge Cases: Testing error handling and unusual scenarios

LICENSE

©2022-2025 by Logue. Licensed under the MIT License.