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Building an Angular Library

Angular libraries are built for supporting many different services and functionality. Angular libraries can be built using Vite that can be published to npm.

Creating a Library​

If you are creating a new package, use the library schematic:

ng generate lib my-lib

For an existing library, follow the setup instructions.

Setup​

Install the @analogjs/platform package:

npm install @analogjs/platform --save-dev

Next, create a vite.config.ts at the root of the project, and configure it to build the library.

Update the references to my-lib to match the library project name.

import { defineConfig } from 'vite';
import angular from '@analogjs/vite-plugin-angular';

export default defineConfig(({ mode }) => ({
  root: __dirname,
  cacheDir: '../../node_modules/.vite/libs/my-lib',
  plugins: [angular()],
  resolve: {
    mainFields: ['module'],
  },
  build: {
    target: ['esnext'],
    sourcemap: true,
    lib: {
      // Library entry point
      entry: 'src/public-api.ts',

      // Package output path, must contain fesm2022
      fileName: `fesm2022/my-lib`,

      // Publish as ESM package
      formats: ['es'],
    },
    rollupOptions: {
      // Add external libraries that should be excluded from the bundle
      external: [/^@angular\/.*/, 'rxjs', 'rxjs/operators'],
      output: {
        // Produce a single file bundle
        preserveModules: false,
      },
    },
    minify: false,
  },
}));

Next, update the project configuration to use the @analogjs/platform:vite builder to build the library.

{
  "name": "my-lib",
  "$schema": "../../node_modules/nx/schemas/project-schema.json",
  "sourceRoot": "projects/my-lib/src",
  "prefix": "lib",
  "projectType": "library",
  "architect": {
    "build": {
      "builder": "@analogjs/platform:vite",
      "options": {
        "configFile": "projects/my-lib/vite.config.ts",
        "outputPath": "dist/projects/my-lib"
      },
      "defaultConfiguration": "production",
      "configurations": {
        "development": {
          "mode": "development"
        },
        "production": {
          "sourcemap": true,
          "mode": "production"
        }
      }
    }
  }
}

Adjust the package.json at the root of the project to point to the built output. Include any necessary dependencies or peerDependencies that are needed when installing the package.

{
  "name": "my-lib",
  "description": "A description of the Angular library",
  "type": "module",
  "peerDependencies": {
    "@angular/common": "^19.0.0",
    "@angular/core": "^19.0.0"
  },
  "dependencies": {
    "tslib": "^2.0.0"
  },
  "types": "./src/public-api.d.ts",
  "exports": {
    "./package.json": {
      "default": "./package.json"
    },
    ".": {
      "import": "./fesm2022/my-lib.mjs",
      "require": "./fesm2022/my-lib.mjs",
      "default": "./fesm2022/my-lib.mjs"
    }
  },
  "sideEffects": false,
  "publishConfig": {
    "access": "public"
  }
}

Copying Assets​

Static assets in the public directory are copied to the build output directory by default. If you want to copy additional assets outside of that directory, use the nxCopyAssetsPlugin Vite plugin.

Import the plugin and set it up:

/// <reference types="vitest" />

import { defineConfig } from 'vite';
import analog from '@analogjs/vite-plugin';
import { nxCopyAssetsPlugin } from '@nx/vite/plugins/nx-copy-assets.plugin';

// https://vitejs.dev/config/
export default defineConfig(({ mode }) => ({
  // ...
  plugins: [angular(), nxCopyAssetsPlugin(['*.md', 'package.json'])],
}));

Building the Library​

Run the build command:

ng build my-lib

Publishing the Library​

After logging using npm login, use the npm publish command to publish the package.

To see the output without publishing, use the --dry-run flag.

npm publish dist/projects/my-lib --dry-run

To publish the library to npm:

npm publish dist/projects/my-lib