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@ngstack/code-editor

Code editor component for Angular applications.

Based on the Monaco editor that powers VS Code.

Installing

npm install @ngstack/code-editor

Integrating with Standalone Angular Project

Update the app.config.ts file to provide the code editor configuration:

export const appConfig: ApplicationConfig = {
  providers: [
    provideZoneChangeDetection({ eventCoalescing: true }),
    provideRouter(routes),
    provideAnimationsAsync(),
    
    // Configure Code Editor
    provideCodeEditor({
      // editorVersion: '0.46.0',
      // use local Monaco installation
      baseUrl: 'assets/monaco',
      // use local Typings Worker
      typingsWorkerUrl: 'assets/workers/typings-worker.js'
    })
  ]
};

Integrating with Modules-based Angular Project

Import CodeEditorModule into your main application module:

import { provideCodeEditor } from '@ngstack/code-editor';

@NgModule({
  providers: [provideCodeEditor()]
})
export class AppModule {}

If you want to use a specific version of the Monaco editor, use editorVersion parameter. If not provided, the component is always going to use the latest version.

For a full list of Monaco versions and changes, please refer to the official CHANGELOG.md file

import { provideCodeEditor } from '@ngstack/code-editor';

@NgModule({
  providers: [
    provideCodeEditor({
      editorVersion: '0.44.0'
    })
  ]
})
export class AppModule {}

Update template to use the ngs-code-editor:

<ngs-code-editor [theme]="theme" [codeModel]="model" [options]="options" (valueChanged)="onCodeChanged($event)"></ngs-code-editor>

Update component controller class and provide corresponding properties and events:

export class AppComponent {
  theme = 'vs-dark';

  model: CodeModel = {
    language: 'json',
    uri: 'main.json',
    value: '{}'
  };

  options = {
    contextmenu: true,
    minimap: {
      enabled: true
    }
  };

  onCodeChanged(value) {
    console.log('CODE', value);
  }
}

Input Properties

The codeModel property holds the value that implements the CodeModel interface:

export interface CodeModel {
  language: string;
  value: string;
  uri: string;

  dependencies?: Array<string>;
  schemas?: Array<{
    uri: string;
    schema: Object;
  }>;
}

Editor Options

For available options see IEditorConstructionOptions docs.

The following options are used by default when Editor Component gets created:

{
  "lineNumbers": true,
  "contextmenu": false,
  "minimap": {
    "enabled": false
  }
}

Output Events

Component API

Editor Service

The component comes with a separate CodeEditorService service that provides additional APIs for the underlying monaco editor:

Typings

The editor is able to resolve typing libraries when set to the Typescript or Javascript language.

Use dependencies property to provide a list of libraries to resolve

<ngs-code-editor [codeModel]="model"> </ngs-code-editor>

And in the controller class:

export class MyEditorComponent {
  codeModel: CodeModel = {
    language: 'typescript',
    uri: 'main.ts',
    value: '',
    dependencies: ['@types/node', '@ngstack/translate', '@ngstack/code-editor']
  };
}

Run your application, it may take a few seconds to resolve dependencies. It is performed in the background (web worker), so you can type your code.

Try pasting the following snippet at runtime:

import { TranslateModule, TranslateService } from '@ngstack/translate';
import { CodeEditorModule } from '@ngstack/code-editor';
import * as fs from 'fs';

export class MyClass {
  constructor(translate: TranslateService) {}
}

You should have all the types resolved and auto-completion working.

JSON schemas

You can associate multiple schemas when working with JSON files.

<ngs-code-editor [codeModel]="model"></ngs-code-editor>

Provide the required schemas like in the example below.

export class MyEditorComponent {
  codeModel: CodeModel = {
    language: 'json',
    uri: 'main.json',
    value: '{ "test": true }',
    schemas: [
      {
        uri: 'http://custom/schema.json',
        schema: {
          type: 'object',
          properties: {
            type: {
              enum: ['button', 'textbox']
            }
          }
        }
      }
    ]
  };
}

The schemas get automatically installed and associated with the corresponding file.

Accessing Code Editor Instance

You can access the Code Editor component instance API from other components when using with the @ViewChild:

class MyComponent {
  private _codeEditor: CodeEditorComponent;

  @ViewChild(CodeEditorComponent, { static: false })
  set codeEditor(value: CodeEditorComponent) {
    this._codeEditor = value;
  }

  get codeEditor(): CodeEditorComponent {
    return this._codeEditor;
  }
}

The code above allows you to use the code editor within the *ngIf, for example:

<ng-container *ngIf="selectedModel">
  <ngs-code-editor [codeModel]="selectedModel"></ngs-code-editor>
</ng-container>

Other components can now have access to the editor instance:

<button mat-icon-button title="Format code" (click)="codeEditor?.formatDocument()">
  <mat-icon>format_align_left</mat-icon>
</button>

Example: auto-formatting on load

<ngs-code-editor [codeModel]="selectedModel" [options]="options" (codeModelChanged)="onCodeModelChanged($event)"></ngs-code-editor>

import { CodeModelChangedEvent } from '@ngstack/code-editor';

class MyComponent {
  onCodeModelChanged(event: CodeModelChangedEvent) {
    setTimeout(() => {
      event.sender.formatDocument();
    }, 100);
  }
}

Offline Setup

Editor

You can run the editor in the offline mode with your Angular CLI application using the following steps:

Install the monaco-editor:

npm install monaco-editor

Update the angular.json file and append the following asset rule:

{
  "glob": "**/*",
  "input": "../node_modules/monaco-editor/min",
  "output": "./assets/monaco"
}

Update the main application module and setup the service to use the custom baseUrl when application starts:

import { provideCodeEditor } from '@ngstack/code-editor';

@NgModule({
  providers: [
    provideCodeEditor({
      baseUrl: 'assets/monaco'
    })
  ]
})
export class AppModule {}

Typings Worker

Update the angular.json file and append the following asset rule:

{
  "glob": "**/*.js",
  "input": "../node_modules/@ngstack/code-editor/workers",
  "output": "./assets/workers"
}

Then update the CodeEditorService configuration at the application startup:

import { provideCodeEditor } from '@ngstack/code-editor';

@NgModule({
  providers: [
    provideCodeEditor({
      typingsWorkerUrl: 'assets/workers/typings-worker.js'
    })
  ]
})
export class AppModule {}

Lazy Loading

To enable Lazy Loading use CodeEditorModule.forRoot() in the main application, and CodeEditorModule in all lazy-loaded feature modules.

For more details please refer to Lazy Loading Feature Modules