@analogjs/astro-angular

@analogjs/astro-angular

An Angular integration for rendering components in Astro

Setup

Using the Astro CLI

Use the astro add command to install the integration

# Using NPM
npx astro add @analogjs/astro-angular
# Using Yarn
yarn astro add @analogjs/astro-angular
# Using PNPM
pnpm astro add @analogjs/astro-angular

This command:

• Installs the @analogjs/astro-angular package.
• Adds the @analogjs/astro-angular integration to the astro.config.mjs file.
• Installs the necessary dependencies to render Angular components on the server and client, and common Angular dependencies, such as @angular/common.

Setting up the TypeScript config

The integration needs a tsconfig.app.json at the root of the project for compilation.

Create a tsconfig.app.json in the root of the project.

{
  "extends": "./tsconfig.json",
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "forceConsistentCasingInFileNames": true,
    "strict": true,
    "noImplicitOverride": true,
    "noPropertyAccessFromIndexSignature": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "sourceMap": true,
    "declaration": false,
    "downlevelIteration": true,
    "experimentalDecorators": true,
    "moduleResolution": "node",
    "importHelpers": true,
    "noEmit": false,
    "target": "es2020",
    "module": "es2020",
    "lib": ["es2020", "dom"],
    "skipLibCheck": true
  },
  "angularCompilerOptions": {
    "enableI18nLegacyMessageIdFormat": false,
    "strictInjectionParameters": true,
    "strictInputAccessModifiers": true,
    "strictTemplates": true,
    "allowJs": false
  },
  "files": [],
  "include": ["src/**/*.ts", "src/**/*.tsx"]
}

Go to Defining A Component to set up an Angular component to use in an Astro component.

Manual Installation

The integration can also be installed manually

Install the Astro Integration

yarn add @analogjs/astro-angular --dev

Install the necessary Angular dependencies

yarn add @angular-devkit/build-angular, @angular/animations, @angular/common, @angular/compiler-cli, @angular/compiler, @angular/core, @angular/language-service, @angular/forms, @angular/platform-browser, @angular/platform-browser-dynamic, @angular/platform-server, rxjs, zone.js, tslib --dev

Adding the integration

Add the integration to the astro.config.mjs

import { defineConfig } from 'astro/config';
import angular from '@analogjs/astro-angular';

export default defineConfig({
  integrations: [angular()],
});

Go to Defining A Component

Configuration

Configure Vite Angular Plugin

Provide an option object to configure the @analogjs/vite-plugin-angular powering this plugin.

import { defineConfig } from 'astro/config';
import angular from '@analogjs/astro-angular';

export default defineConfig({
  integrations: [
    angular({
      vite: {
        inlineStylesExtension: 'scss|sass|less',
      },
    }),
  ],
});

Defining A Component

The Astro Angular integration only supports rendering standalone components:

import { NgIf } from '@angular/common';
import { Component, Input } from '@angular/core';

@Component({
  selector: 'app-hello',
  standalone: true,
  imports: [NgIf],
  template: `
    <p>Hello from Angular!!</p>

    <p *ngIf="show">{{ helpText }}</p>

    <button (click)="toggle()">Toggle</button>
  `,
})
export class HelloComponent {
  @Input() helpText = 'help';

  show = false;

  toggle() {
    this.show = !this.show;
  }
}

Add the Angular component to the Astro component template. This only renders the HTML from the Angular component.

---
import { HelloComponent } from '../components/hello.component';

const helpText = "Helping binding";
---

<HelloComponent />
<HelloComponent helpText="Helping" />
<HelloComponent helpText={helpText} />

To hydrate the component on the client, use one of the Astro client directives:

---
import { HelloComponent } from '../components/hello.component';
---

<HelloComponent client:visible />

Find more information about Client Directives in the Astro documentation.

Adding Component Providers

Additional providers can be added to a component for static rendering and client hydration.

These are renderProviders and clientProviders respectively. These providers are defined as static arrays on the Component class, and are registered when the component is rendered, and hydrated on the client.

import { Component, OnInit, inject } from '@angular/core';
import { NgFor } from '@angular/common';
import { provideHttpClient, HttpClient } from '@angular/common/http';

interface Todo {
  id: number;
  title: string;
  completed: boolean;
}

@Component({
  selector: 'app-todos',
  standalone: true,
  imports: [NgFor],
  template: `
    <h2>Todos</h2>

    <ul>
      <li *ngFor="let todo of todos">
        {{ todo.title }}
      </li>
    </ul>
  `,
})
export class TodosComponent implements OnInit {
  static clientProviders = [provideHttpClient()];
  static renderProviders = [];

  http = inject(HttpClient);
  todos: Todo[] = [];

  ngOnInit() {
    this.http
      .get<Todo[]>('https://jsonplaceholder.typicode.com/todos')
      .subscribe((todos) => (this.todos = todos));
  }
}

Using Components in MDX pages

To use components with MDX pages, you must install and configure MDX support by following the Astro integration of @astrojs/mdx. Your astro.config.mjs should now include the @astrojs/mdx integration.

import { defineConfig } from 'astro/config';
import mdx from '@astrojs/mdx';
import angular from '@analogjs/astro-angular';

export default defineConfig({
  integrations: [mdx(), angular()],
});

Create an .mdx file inside the src/pages directory and add the Angular component import below the frontmatter.

---
layout: '../../layouts/BlogPost.astro'
title: 'Using Angular in MDX'
description: 'Lorem ipsum dolor sit amet'
pubDate: 'Sep 22 2022'
---

import { HelloComponent } from "../../components/hello.component.ts";

<HelloComponent />
<HelloComponent helpText="Helping" />

To hydrate the component on the client, use one of the Astro client directives:

---
layout: '../../layouts/BlogPost.astro'
title: 'Using Angular in MDX'
description: 'Lorem ipsum dolor sit amet'
pubDate: 'Sep 22 2022'
---

import { HelloComponent } from "../../components/hello.component.ts";

<HelloComponent client:load />
<HelloComponent client:visible helpText="Helping" />

Important: In .mdx files the component import must end with the .ts suffix. Otherwise the dynamic import of the component will fail and the component won't be hydrated.

Current Limitations

• Only standalone Angular components in version v14.2+ are supported
• Component Outputs are not supported