Monaco GraphQL

GraphQL language plugin for the Monaco Editor. You can use it to build vscode/codespaces-like web or desktop IDEs using whatever frontend javascript libraries or frameworks you want, or none!

webpack example using plain javascript
live demo of the monaco webpack example (prompts for github access token!)

NOTE: This is in pre-release state as we build towards GraphiQL 2.0.x. codemirror-graphql has more features (such as JSON variables validation) and is more stable.

Features

It provides the following features while editing GraphQL files:

Configurable multi-model, multi-schema language worker with fileMatch expressions
Code completion (schema driven) for Operation and SDL types
- Automatic expansion & completion on leaf type completion
Hover (schema driven) with markdown support
Validation (schema driven)
JSON Variables validation and language features (schema driven)
Formatting - using prettier
Syntax Highlighting & Basic Languages provided by monaco-editor basic languages support
Configurable formatting options
Providing external fragments
create custom workers for custom language service options - parser, validation rules, schemaBuilder, etc

Usage

For now, we use language id of graphql until we can ensure we can dovetail nicely with the official graphql language ID.

To use with webpack, here is an example to get you started:

yarn add monaco-graphql

Sync Example

import * as monaco from 'monaco-editor/esm/vs/editor/editor.api';

import { initializeMode } from 'monaco-graphql/esm/initializeMode';

// you can also configure these using the webpack or vite plugins for `monaco-editor`
import EditorWorker from 'worker-loader!monaco-editor/esm/vs/editor/editor.worker';
import GraphQLWorker from 'worker-loader!monaco-graphql/esm/graphql.worker';

// instantiates the worker & language features with the schema!
const MonacoGraphQLAPI = initializeMode({
  schemas: [
    {
      schema: myGraphqlSchema as GraphQLSchema,
      // anything that monaco.URI.from() is compatible with
      uri: 'https://myschema.com',
      uri: '/myschema.graphql',
      // match the monaco file uris for this schema.
      // accepts specific uris and anything `picomatch` supports.
      // (everything except bracket regular expressions)
      fileMatch: ['**/*.graphql'],
      // note: not sure if ^ works if the graphql model is using urls for uris?
    },
  ],
});

window.MonacoEnvironment = {
  getWorker(_workerId: string, label: string) {
    if (label === 'graphql') {
      return new GraphQLWorker();
    }
    return new EditorWorker();
  },
};
monaco.editor.create(document.getElementById('someElementId'), {
  value: 'query { }',
  language: 'graphql',
  formatOnPaste: true,
});

Lazy Example

The existing API works as before in terms of instantiating the schema

import * as monaco from 'monaco-editor/esm/vs/editor/editor.api';

// enables our language workern right away, despite no schema
import 'monaco-graphql';

// you can also configure these using the webpack or vite plugins for `monaco-editor`
import EditorWorker from 'worker-loader!monaco-editor/esm/vs/editor/editor.worker';
import GraphQLWorker from 'worker-loader!monaco-graphql/esm/graphql.worker';

// lazily invoke the api config methods whenever we want!
monaco.languages.graphql.setSchemaConfig([
  {
    schema: myGraphqlSchema as GraphQLSchema,
    // anything that monaco.URI.from() is compatible with
    uri: 'https://myschema.com',
    uri: '/myschema.graphql',
    // match the monaco file uris for this schema.
    // accepts specific uris and anything `picomatch` supports.
    // (everything except bracket regular expressions)
    fileMatch: ['**/*.graphql'],
    // note: not sure if ^ works if the graphql model is using urls for uris?
  },
]);

window.MonacoEnvironment = {
  getWorker(_workerId: string, label: string) {
    if (label === 'graphql') {
      return new GraphQLWorker();
    }
    return new EditorWorker();
  },
};
monaco.editor.create(document.getElementById('someElementId'), {
  value: 'query { }',
  language: 'graphql',
  formatOnPaste: true,
});

This will cover the basics, making an HTTP POST with the default introspectionQuery() operation. To customize the entire fetcher, see advanced customization below. For more customization options, see the Monaco Editor API Docs

Advanced Usage

Variables JSON Support!

In monaco-graphql@0.5.0 we introduced a method getVariablesJSONSchema that allows you to retrive a JSONSchema description for the declared variables for any given set of operations

Full Sync Demo with Variables JSON

import * as monaco from 'monaco-editor/esm/vs/editor/editor.api';

import { initializeMode } from 'monaco-graphql/esm/initializeMode';

import EditorWorker from 'worker-loader!monaco-editor/esm/vs/editor/editor.worker';
import GraphQLWorker from 'worker-loader!monaco-graphql/esm/graphql.worker';

window.MonacoEnvironment = {
  getWorker(_workerId: string, label: string) {
    if (label === 'graphql') {
      return new GraphQLWorker();
    }
    return new EditorWorker();
  },
};

// the language service will be instantiated once the schema is available
  const MonacoGraphQLAPI = initializeMode({
    schemas: [{
      // anything that monaco.URI.from() is compatible with
      uri: 'https://myschema.com',
      // match the monaco file uris for this schema.
      // accepts specific filenames and anything `picomatch` supports.
      fileMatch: ["**/*.graphql"],
      schema: myGraphqlSchema as GraphQLSchema
    }],
  })


const operationModel  = monaco.editor.createModel(
  'query {}',
  'graphql',
  '/operation.graphql',
);

const operationEditor = monaco.editor.create(
  document.getElementById('someElementId'),
  {
    model: operationModel,
    language: 'graphql',
    formatOnPaste: true,
  },
);

const variablesSchemaUri = monaco.editor.URI.file('/variables-schema.json');

const variablesModel = monaco.editor.createModel(
  '{}',
  'json',
  '/variables.json',
);

const variablesEditor = monaco.editor.create(
  document.getElementById('someElementId'),
  {
    model: variablesModel,
    language: 'graphql',
    formatOnPaste: true,
  },
);

  // high-level method for configuring json variables validation
  MonacoGraphQLAPI.setDiagnosticSettings({
    validateVariablesJson: {
      // Urls, uris, anything that monaco.URI.from() is compatible with.
      // Match operation model to variables editor,
      // and the language service will automatically listen for changes,
      // and compute the json schema using the GraphQLWorker.
      // This is in the main process is applied to the global monaco json settings
      // for validation, completion and more using monaco-json's built-in JSON Schema support.
      [operationModel.uri.toString()]: [variablesModel.uri.toString()]
    },
    jsonDiagnosticSettings: {
      allowComments: true, // allow json, parse with a jsonc parser to make requests
    }
  })
  // TODO: document manual alternative approach
})();

You can also experiment with the built-in I think jsonc? (MSFT json5-ish syntax, for tsconfig.json etc) and the 3rd party monaco-yaml language modes for completion of other types of variable input. you can also experiment with editor methods to parse detected input into different formats, etc (yaml pastes as json, etc)

You could of course prefer to generate a jsonschema form for variables input using a framework of your choice, instead of an editor. Enjoy!

`MonacoGraphQLAPI` (typedoc)

If you call any of these API methods to modify the language service configuration at any point at runtime, the webworker will reload relevant language features.

If you import 'monaco-graphql' synchronously, you can access the api via monaco.languages.graphql.api.

import 'monaco-graphql';
// now the api will be available on the `monaco.languages` global
monaco.languages.graphql.api;

import 'monaco-graphql';

// also this
import { languges } from 'monaco-editor';
// now the api will be available on the `monaco.languages` global
languages.graphql.api;

Otherwise, you can, like in the sync demo above:

import { initializeMode } from 'monaco-graphql/esm/initializeMode';
const api = intializeMode(config);

`monaco.languages.graphql.api.setSchemaConfig([SchemaConfig])`

same as the above, except it overwrites the entire schema config.

you can provide multiple, and use fileMatch to map to various uri "directory" globs or specific files. uri can be a url or file path, anything parsable

// you can load it lazily
import 'monaco-graphql';
monaco.languages.graphql.api.setSchemaConfig([
  {
    schema: GraphQLSchema,
    fileMatch: ['**/*.graphql'],
    uri: 'myschema.graphql',
  },
]);

or you can load the language features only when you have your schema

import { initializeMode } from 'monaco-graphql/esm/initializeMode';

const schemas  = [
  {
    schema: GraphQLSchema,
    fileMatch: ['operations/*.graphql'],
    uri: 'myschema.graphql',
  },
]
const api = intializeMode({ schemas });

// add another schema. this will cause language workers and features to reset
api.setSchemaConfig([
  ..schemas,
  {
    introspectionJSON: myIntrospectionJSON,
    fileMatch: ['specific/monaco/uri.graphql'],
    uri: 'another-schema.graphql',
  },
]);

or if you want, replace the entire configuration with a single schema. this will cause the worker to be entirely re-created and language services reset

api.setSchemaConfig([
  {
    introspectionJSON: myIntrospectionJSON,
    fileMatch: ['**/*.graphql'],
    uri: 'myschema.graphql',
  },
]);

`monaco.languages.graphql.api.setModeConfiguration()`

This is where you can toggle monaco language features. all are enabled by default.

monaco.languages.graphql.api.setModeConfiguration({
  documentFormattingEdits: true,
  completionItems: true,
  hovers: true,
  documentSymbols: true,
  diagnostics: true,
});

`monaco.languages.graphql.api.setFormattingOptions()`

this accepts an object { prettierConfig: prettier.Options }, which accepts any prettier option. it will not re-load the schema or language features, however the new prettier options will take effect.

this method overwrites the previous configuration, and will only accept static values that can be passed between the main/worker process boundary.

monaco.languages.graphql.api.setFormattingOptions({
  // if you wanna be like that
  prettierOptions: { tabWidth: 2, useTabs: true },
});

`monaco.languages.graphql.api.setExternalFragmentDefintions()`

Append external fragments to be used by autocomplete and other language features.

This accepts either a string that contains fragment definitions, or TypeDefinitionNode[]

`monaco.languages.graphql.api.getDiagnosticOptions`

monaco.languages.graphql.api.setDiagnosticSettings({
  validateVariablesJson: {
    // Urls, uris, anything that monaco.URI.from() is compatible with.
    // Match operation model to variables editor,
    // and the language service will automatically listen for changes,
    // and compute the json schema using the GraphQLWorker.
    // This is in the main process is applied to the global monaco json settings
    // for validation, completion and more using monaco-json's built-in JSON Schema support.
    [operationModel.uri.toString()]: [variablesModel.uri.toString()],
  },
  jsonDiagnosticSettings: {
    allowComments: true, // allow json, parse with a jsonc parser to make requests
  },
});

Bundlers

Webpack

you'll can refer to the webpack configuration in the full monaco webpack example to see how it works with webpack and the official monaco-editor-webpack-plugin. there is probably an easier way to configure webpack worker-loader for this.

Vite

You can configure vite to load monaco-editor json mode and even the language editor worker using the example for our mode

Web Frameworks

the plain javascript webpack example should give you a starting point to see how to implement it with

React

use-monaco seems to support the custom language worker configuration we want, and seems to be well built! we hope to help them build their
when loading it yourself, either dynamic import the mode and/or instantiate it yourself using useEffect on didMount to prevent breaking SSR.
it may work with other libraries by using a similar strategy to this. you can also provide MonacoEnvironment.getWorkerUrl which works better as an async import of your pre-build worker files

Custom Webworker (for passing non-static config to worker)

If you want to pass a custom parser and/or or validation rules, it is supported, however the setup is a bit more complicated.

You can add any LanguageServiceConfig (typedoc) configuration options you like here to languageConfig as below.

This is because we can't pass non-static configuration to the existing worker programatically, so you must import these and build the worker custom with those functions. Part of the (worthwile) cost of crossing runtimes!

you'll want to create your own mygraphql.worker.ts file, and add your custom config such as schemaLoader to createData:

import type { worker as WorkerNamespace } from 'monaco-editor';
// @ts-ignore
import * as worker from 'monaco-editor/esm/vs/editor/editor.worker';

import { GraphQLWorker } from 'monaco-graphql/esm/GraphQLWorker';

import { myValidationRules } from './custom';

self.onmessage = () => {
  try {
    worker.initialize(
      (
        ctx: WorkerNamespace.IWorkerContext,
        createData: monaco.languages.graphql.ICreateData,
      ) => {
        createData.languageConfig.customValidationRules = myValidationRules;
        return new GraphQLWorker(ctx, createData);
      },
    );
  } catch (err) {
    throw err;
  }
};

then, in your application:

import EditorWorker from 'worker-loader!monaco-editor/esm/vs/editor/editor.worker';

// specify the path to your language worker
import GraphQLWorker from 'worker-loader!./mygraphql.worker';

window.MonacoEnvironment = {
  getWorker(_workerId: string, label: string) {
    if (label === 'graphql') {
      return new GraphQLWorker();
    }
    return new EditorWorker();
  },
};

or, if you have webpack configured for it:

window.MonacoEnvironment = {
  getWorkerUrl(_workerId: string, label: string) {
    if (label === 'graphql') {
      return 'mygraphql.worker.js`;
    }
    return 'editor.worker.js`;
  },
};

with vite you just need:

import { defineConfig } from 'vite';
import monacoEditorPlugin from 'vite-plugin-monaco-editor';

export default defineConfig({
  plugins: [
    monacoEditorPlugin({
      customWorker: [
        {
          label: 'graphql',
          entry: 'mygraphql.worker.js',
        },
      ],
    }),
  ],
});

Monaco Editor Tips

If you are familiar with Codemirror/Atom-era terminology and features, here's some gotchas:

"hinting" => "code completion" in LSP terminology
"linting" => "diagnostics" in lsp terminology
the default keymap is different, more vscode like
command palette and right click context menu are important
you can extend the standard completion/linting/etc provided. for example, editor.setModelMarkers()
Monaco Editor API Docs
Monaco Editor Samples repository is great for tips on implementing with different bundlers, runtimes, etc

TODO

[x] variables JSON validation
[x] variables completion
[ ] Symbols & Definitions
[x] file uri-driven schema loading
[x] op -> schema & schema -> schema references
[x] insertText for field and argument completion

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