dotnet new install Umbraco.Templates

dotnet new umbraco-extension -n MyExtension

dotnet new umbraco-extension -n MyExtension -ex

MyExtension/
├── MyExtension.csproj        # .NET project file
├── Constants.cs              # Extension constants
├── README.md                 # Setup instructions
└── Client/                   # TypeScript source
    ├── package.json
    ├── tsconfig.json
    ├── vite.config.ts
    └── src/
        └── ...               # Your extension code

MyExtension/
├── MyExtension.csproj
├── Constants.cs
├── README.md
├── Composers/                # C# composers
│   └── SwaggerComposer.cs    # API documentation setup
├── Controllers/              # C# API controllers
│   └── MyExtensionController.cs
└── Client/
    ├── package.json
    ├── tsconfig.json
    ├── vite.config.ts
    └── src/
        ├── api/              # Generated API client
        ├── dashboards/       # Example dashboard
        └── entrypoints/      # Extension entry point

# Navigate to Client folder
cd MyExtension/Client

# Install dependencies
npm install

# Development with hot reload
npm run watch

# Production build
npm run build

# Type checking
npm run check

dotnet publish --configuration Release

dotnet pack --configuration Release

export const manifests: Array<UmbExtensionManifest> = [
  {
    name: "My Extension Entrypoint",
    alias: "MyExtension.Entrypoint",
    type: "backofficeEntryPoint",
    js: () => import("./entrypoint.js"),
  },
];

import type { UmbEntryPointOnInit } from "@umbraco-cms/backoffice/extension-api";

export const onInit: UmbEntryPointOnInit = (_host, _extensionRegistry) => {
  console.log("Extension loaded!");
};