@codingame/monaco-vscode-api ·

This NPM module allows to integrate full VSCode functionality into your monaco-editor.

For more information, please checkout the project's wiki.

Installation

1npm install vscode@npm:@codingame/monaco-vscode-api
2npm install monaco-editor@npm:@codingame/monaco-vscode-editor-api
3npm install -D @types/vscode

@codingame/monaco-vscode-api is installed as an alias to vscode to be able to run import * as vscode from 'vscode', similar to what is done inside a VSCode extension

@codingame/monaco-vscode-editor-api is installed as an alias to monaco-editor because it provides the same api as the official monaco-editor

Usage

If you are just starting with monaco-editor and monaco-vscode-api you may find helpful the Getting Started Guide in the wiki.

Monaco service override

Most of VSCode functionality implemented as "services", e.g.

• theme service, providing support for VSCode themes
• languages service, providing support for different language features.

By default, Monaco uses a simplified versions of the VSCode services, called standalone services. This package allows to

1. override them with fully-functional alternatives from VSCode
2. add new services that were not included in Monaco

Here is an example usage that overrides Monaco default configuration with VSCode json-based settings:

1// default monaco-editor imports
2import * as monaco from 'monaco-editor';
3import editorWorker from 'monaco-editor/esm/vs/editor/editor.worker?worker';
4
5// utilities to override Monaco services
6import { initialize } from 'vscode/services'
7import getConfigurationServiceOverride, { updateUserConfiguration } from '@codingame/monaco-vscode-configuration-service-override'
8
9window.MonacoEnvironment = {
10  getWorker: (_moduleId, _label) => new editorWorker()
11}
12
13// overriding Monaco service with VSCode
14await initialize({
15    ...getConfigurationServiceOverride(),
16});
17
18// json config like in vscode settings.json
19updateUserConfiguration(`{
20    "editor.fontSize": 30,
21    "editor.lineHeight": 30,
22    "editor.fontFamily": "monospace",
23    "editor.fontWeight": "bold",
24    "editor.letterSpacing": 0,
25}`)
26
27// creating an editor with VSCode configuration
28monaco.editor.create(document.getElementById('editor')!, {
29    value: "Editor with VSCode config and large bold fonts",
30});

[!NOTE] initialize can only be called once (and it should be called BEFORE creating your first editor).

Each get<service-name>ServiceOverride contains the service and some glue to make VSCode service work with Monaco.

List of service overrides

Some basic service overrides are coming with this package as dependencies:

• Base: @codingame/monaco-vscode-base-service-override
  • Contains some general-use services that are mandatory to most of the other features
• Host: @codingame/monaco-vscode-host-service-override
  • Interaction with the host/browser (shutdown veto, focus/active management, window opening, fullscreen...)
• Extensions: @codingame/monaco-vscode-extensions-service-override
  • Support for VSCode extensions.
  • A worker configuration can be provided to it:
    • Then, the webworker extension host will be available, allowing to run extensions in a worker which runs in an iframe
• Files: @codingame/monaco-vscode-files-service-override
  • It adds the overlay filesystem for file:// files, but also adds the support for lazy loaded extension files. It adds separate memory user files (e.g. config, keybindings), cache files and log files
  • It supports adding overlay filesystems for file:// files
• QuickAccess: @codingame/monaco-vscode-quickaccess-service-override
  • Enables the quickaccess menu in the editor (press F1 or ctrl+shift+p)

However, most of the services are separated into different modules, so they can be imported as required. You can find a full list of services in the corresponding wiki page.

Default vscode extensions

VSCode uses a bunch of default extensions. Most of them are used to load the default languages and grammars (see https://github.com/microsoft/vscode/tree/main/extensions).

This library bundles and publishes them as separate packages, which allows to use the ones you want. To use an extension, just install the corresponding package and import it in the beginning of the file:

1import '@codingame/monaco-vscode-javascript-default-extension'
2import '@codingame/monaco-vscode-json-default-extension'
3...

Here is an example of usage of default VSCode theme extension with theme service override:

1// importing default VSCode theme extension
2import "@codingame/monaco-vscode-theme-defaults-default-extension";	
3
4// default monaco-editor imports
5import * as monaco from 'monaco-editor';
6import editorWorker from 'monaco-editor/esm/vs/editor/editor.worker?worker';
7
8// utilities to override Monaco services
9import { initialize } from 'vscode/services'
10import getThemeServiceOverride from "@codingame/monaco-vscode-theme-service-override";
11
12window.MonacoEnvironment = {
13  getWorker: function (_moduleId, _label) {
14	return new editorWorker();
15  }
16}
17
18// overriding Monaco service with VSCode
19await initialize({
20    ...getThemeServiceOverride(),
21});
22
23// creating an editor with VSCode theme
24monaco.editor.create(document.getElementById('editor')!, {
25    value: "Editor with VSCode Theme Support",
26});

See the full list of ported default extensions

Loading vsix file

VSCode extensions are bundled as vsix files. This library publishes a rollup plugin (vite-compatible) that allows to load a vsix file.

• rollup/vite config:

1import vsixPlugin from '@codingame/monaco-vscode-rollup-vsix-plugin'
2...
3plugins: [
4  ...,
5  vsixPlugin()
6]

• code:

1import './extension.vsix'

Localization

This library also offers the possibility to localize vscode and the extensions in the supported languages. To do so, import one of the following packages before anything else:

• @codingame/monaco-vscode-language-pack-cs
• @codingame/monaco-vscode-language-pack-de
• @codingame/monaco-vscode-language-pack-es
• @codingame/monaco-vscode-language-pack-fr
• @codingame/monaco-vscode-language-pack-it
• @codingame/monaco-vscode-language-pack-ja
• @codingame/monaco-vscode-language-pack-ko
• @codingame/monaco-vscode-language-pack-pl
• @codingame/monaco-vscode-language-pack-pt-br
• @codingame/monaco-vscode-language-pack-qps-ploc
• @codingame/monaco-vscode-language-pack-ru
• @codingame/monaco-vscode-language-pack-tr
• @codingame/monaco-vscode-language-pack-zh-hans
• @codingame/monaco-vscode-language-pack-zh-hant

⚠️ The language pack should be imported and loaded BEFORE anything else from this library is loaded. Otherwise, some translations would be missing and an error would be displayed in the console. ⚠️

Model creation

The official monaco-editor package provides a function to create models: monaco.editor.createModel.

This method creates a standalone model that cannot be found or used by any VSCode services.

The recommended way is to used the createModelReference method instead (added on top of the official monaco-editor api) which returns instead a reference to a model.

It has some pros:

• The model reference can be used by VSCode services, allowing for instance following links between files (ctrl+click)
• The returned model is bound to a filesystem file, and you have access to methods allowing to control the file lifecycle (saving the file, accessing the dirty state...)
• It is possible to call the method multiple times on the same file to get multiple references. The model is disposed when there is no reference left

To work, it needs the file to exist on the virtual filesystem. It can be achieved either by:

• using the registerFileSystemOverlay from the files service override, which can be cleaned when not needed anymore (recommended)
• by using the second argument of the createModelReference function, which writes the file content to the virtual filesystem before creating the model

before:

1import * as monaco from 'monaco-editor'
2const model = monaco.editor.createModel(...)
3const editor = monaco.editor.create({ model, ... })
4
5...
6
7model.dispose()
8editor.dispose()
9

after:

1import * as monaco from 'monaco-editor'
2import { RegisteredFileSystemProvider, RegisteredMemoryFile, registerFileSystemOverlay } from '@codingame/monaco-vscode-files-service-override'
3
4const fileUri = monaco.Uri.file(<file uri>);
5
6const fileSystemProvider = new RegisteredFileSystemProvider(false)
7fileSystemProvider.registerFile(new RegisteredMemoryFile(fileUri, <file content>))
8const overlayDisposable = registerFileSystemOverlay(1, fileSystemProvider)
9
10const modelRef = await monaco.editor.createModelReference(fileUri)
11
12const editor = monaco.editor.create({ model: modelRef.object.textEditorModel })
13
14...
15
16await modelRef.object.save()
17
18...
19
20modelRef.dispose()
21editor.dispose()
22overlayDisposable.dispose()
23

createModelReference return a reference to a model. The value is fetched from the memory filesystem. The reference can then be disposed, the model will only be disposed if there is no remaining references.

VSCode api usage

To be able to use the VSCode api directly from your code, you need to import vscode/localExtensionHost and wait for the services to be initialized.

You will then be able to import it as if you were in a VSCode extension:

1import * as vscode from 'vscode'
2import 'vscode/localExtensionHost'
3
4const range = new vscode.Range(...)
5vscode.languages.registerCompletionItemProvider(...)

You can also register a new extension from its manifest:

1import { registerExtension, initialize, ExtensionHostKind } from 'vscode/extensions'
2
3await initialize()
4
5const { registerFileUrl, getApi } = registerExtension({
6  name: 'my-extension',
7  publisher: 'someone',
8  version: '1.0.0',
9  engines: {
10      vscode: '*'
11  },
12  contributes: {
13  }
14}, ExtensionHostKind.LocalProcess)
15
16registerFileUrl('/file-extension-path.json', new URL('./file-real-path.json', import.meta.url).toString())
17
18const vscode = await getApi()
19
20vscode.languages.registerCompletionItemProvider(...)
21

Demo

Try it out on https://monaco-vscode-api.netlify.app/

There is a demo that showcases the service-override features. It includes:

• Languages
• VSCode themes
• Textmate grammars (requires VSCode themes)
• Notifications/Dialogs
• Model/Editor services
• Configuration service, with user configuration editor
• Keybinding service, with user keybindings editor
• Debuggers
• Remote agent
• and much more

From CLI run:

1# build monaco-vscode-api (the demo use it as a local dependency)
2npm ci
3npm run build
4# start demo
5cd demo
6npm ci
7npm start
8# OR: for vite debug output
9npm run start:debug

For the debug feature, also run:

1npm run start:debugServer

⚠️ Building monaco-vscode-api is only supported on Linux or Mac. It you use Windows, have a look at WSL ⚠️

Remote agent

See the VSCode Server wiki page.

Troubleshooting

If something doesn't work, make sure to check out the Troubleshooting wiki page.

History

This project was mainly created to make the implementation of monaco-languageclient more robust and maintainable.

monaco-languageclient uses vscode-languageclient which was built to run inside a VSCode extension. VSCode extensions communicate with the editor via an API they can import into their code.

The VSCode api exports:

• Some functions to interact with the IDE (language feature registrations, command execution...)
• A lot of utility classes (Range, Position...)

The first implementations of monaco-languageclient were using a fake VSCode api implementation. The vscode-languageclient was hacked so the VSCode<->protocol object converters were mainly bypassed, so the fake VSCode api was receiving Language Server Protocol objects. Then the objects were transformed using custom transformers into Monaco objects to communicate with the monaco api.

This approach has some disadvantages:

• There is a lot of code to transform LSP objects into Monaco objects
• It's hard to follow the updates of VSCode and the language server protocol
• It doesn't behave exactly the same as in VSCode

With this library, it would be possible to plug vscode-languageclient directly on top of monaco, monaco-languageclient still helps to do so by:

• Adding some tweaks to the VSCode LanguageClient (Removing unsupported features...)
• Providing some examples on how to build an app using it
• Adding some tools (DisposableCollection)