Angular Extended Builder

Forked/inspired by angular-builders

Custom Angular builders that extend @angular/build with support for esbuild plugins, index HTML transformers, and Vite dev-server middlewares.

• Installation
• Builders
• How to
  • Esbuild Plugins
  • Index HTML Transformer
  • Dev Server Middlewares
• Version Compatibility

Installation

npm install angular-extended-builder --save-dev
# or
pnpm add -D angular-extended-builder

Setup

1. Update your angular.json to use the extended builders:

{
	"$schema": "./node_modules/angular-extended-builder/dist/schema.json",
	"projects": {
		"my-app": {
			"architect": {
				"build": {
					"builder": "angular-extended-builder:application",
					"options": {
						"plugins": ["./plugins/my-esbuild-plugin.ts"],
						"indexHtmlTransformer": "./plugins/index-html-transform.mjs",
						// ... your existing build options
					},
				},
				"serve": {
					"builder": "angular-extended-builder:dev-server",
					"options": {
						"middlewares": ["./plugins/my-middleware.ts"],
					},
				},
			},
		},
	},
}

2. The $schema path enables IDE autocomplete and validation for the extended options.

Builders

Name	Extended Options
application	schema.json
dev-server	schema.json

How to

Esbuild Plugins

Add a plugins array in your angular.json at projects.<name>.architect.build.options. Each entry is a path to an ESM/TypeScript module that exports an esbuild plugin:

// plugins/my-plugin.ts
import type { Plugin } from "esbuild"

export default {
	name: "my-plugin",
	setup(build) {
		build.onResolve({ filter: /\.custom$/ }, (args) => {
			return { path: args.path, namespace: "custom" }
		})
	},
} satisfies Plugin

Plugins can also be referenced as npm package names.

Examples: projects/app/plugins

Index HTML Transformer

Add an indexHtmlTransformer path in your angular.json at projects.<name>.architect.build.options. The module should export a default function that receives the HTML string and returns a transformed HTML string:

// plugins/index-html-transform.mjs
export default function transform(html) {
	return html.replace("{placeholder}", "value")
}

Example: projects/app/plugins/index-html-transform.mjs

Dev Server Middlewares

Add a middlewares array in your angular.json at projects.<name>.architect.serve.options. Each entry is a path to a module that exports a Vite-compatible middleware function:

// plugins/my-middleware.ts
import type { IncomingMessage, ServerResponse } from "node:http"

export default function middleware(
	req: IncomingMessage,
	res: ServerResponse,
	next: (err?: unknown) => void,
) {
	// Handle request or call next()
	next()
}

Version Compatibility

The major and minor version of this library aligns with the supported Angular version:

angular-extended-builder	Angular	Node.js
22.x	22.x	>= 22.22
21.x	21.x	>= 22
20.x	20.x	>= 20

Patch releases contain bug fixes and enhancements only. Major and minor releases follow Angular's release cycle.