### Build and Start Theia Browser App

Source: https://theia-ide.org/docs/composing_applications

Commands to build the browser application and then start it. Access the running application via http://localhost:3000.

```bash
yarn build:browser
yarn start:browser
```

--------------------------------

### Build and Start Theia Electron App

Source: https://theia-ide.org/docs/composing_applications

Commands to build the Electron application, which may involve rebuilding native modules, and then start it.

```bash
yarn build:electron
yarn start:electron
```

--------------------------------

### Install and Scaffold Theia Project

Source: https://theia-ide.org/docs/composing_applications

Use Yeoman generator to scaffold a new Theia monorepo project. Ensure you have yo and generator-theia-extension installed globally.

```bash
npm install -g yo generator-theia-extension
mkdir my-theia-app
cd my-theia-app
yo theia-extension # select the 'Hello World' option and complete the prompts
```

--------------------------------

### Install Native Dependencies Behind Proxy

Source: https://theia-ide.org/docs/composing_applications

Use this command when yarn install fails due to proxy issues when building native dependencies. Ensure you provide the correct path to the downloaded node-headers tarball.

```bash
npm_config_tarball=/path/to/node-v8.15.0-headers.tar.gz yarn install
```

--------------------------------

### Browser Application package.json

Source: https://theia-ide.org/docs/composing_applications

Configures a Theia browser application, listing core Theia modules and custom extensions. Includes scripts for bundling and starting the application.

```json
{
  "private": true,
  "name": "browser-app",
  "version": "0.0.0",
  "dependencies": {
    "@theia/core": "latest",
    "@theia/editor": "latest",
    "@theia/filesystem": "latest",
    "@theia/markers": "latest",
    "@theia/messages": "latest",
    "@theia/monaco": "latest",
    "@theia/navigator": "latest",
    "@theia/preferences": "latest",
    "@theia/process": "latest",
    "@theia/terminal": "latest",
    "@theia/workspace": "latest",
    "hello-world": "0.0.0"
  },
  "devDependencies": {
    "@theia/cli": "latest"
  },
  "scripts": {
    "bundle": "yarn rebuild && theia build --mode development",
    "rebuild": "theia rebuild:browser --cacheRoot ..",
    "start": "theia start",
    "watch": "yarn rebuild && theia build --watch --mode development"
  },
  "theia": {
    "target": "browser"
  }
}
```

--------------------------------

### Root package.json for Theia Monorepo

Source: https://theia-ide.org/docs/composing_applications

Defines project-wide settings, scripts for building and starting browser/Electron apps, and dev dependencies like Lerna. Specifies workspaces for the monorepo.

```json
{
  "private": true,
  "engines": {
    "yarn": ">=1.7.0 <2",
    "node": ">=18"
  },
  "scripts": {
    "build:browser": "yarn --cwd browser-app bundle",
    "build:electron": "yarn --cwd electron-app bundle",
    "prepare": "lerna run prepare",
    "postinstall": "theia check:theia-version",
    "start:browser": "yarn --cwd browser-app start",
    "start:electron": "yarn --cwd electron-app start",
    "watch:browser": "lerna run --parallel watch --ignore electron-app",
    "watch:electron": "lerna run --parallel watch --ignore browser-app"
  },
  "devDependencies": {
    "lerna": "2.4.0"
  },
  "workspaces": [
    "hello-world", "browser-app", "electron-app"
  ]
}
```

--------------------------------

### Electron Application Configuration

Source: https://theia-ide.org/docs/composing_applications

Defines a Theia application for Electron. The package.json is similar to the browser app but specifies 'electron' as the target.

```json
{
  "name": "electron-app",
  ...
  "theia": {
    "target": "electron"
  }
}
```

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