# mgdevloper/callmanager architecture

> Architecture diagram of the GitHub repository mgdevloper/callmanager, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-06-25). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/mgdevloper/callmanager
- Repository: https://github.com/mgdevloper/callmanager

## Overview

1. **Overall shape**
   - This is a standard **React Native** mobile app scaffold, using a single shared **TypeScript/JavaScript application layer** plus separate **Android** and **iOS** native host projects.
   - There is no sign of a backend, database, or offline sync layer in this repository; the architecture is primarily a client-side mobile shell.

2. **Main application entry**
   - `index.js` is the runtime entrypoint that boots React Native and registers the root component.
   - `App.tsx` is the top-level UI component and appears to be the main application surface for the shared cross-platform logic.

3. **Cross-platform runtime flow**
   - The JavaScript/TypeScript bundle is served and hot-reloaded through **Metro** (`metro.config.js`), then executed inside the native app on each platform.
   - During development, source edits flow from `App.tsx` through Metro to the simulator/device, with **Fast Refresh** handling live updates.

4. **Android subsystem**
   - The Android app lives under `android/` and is a conventional Gradle-based React Native host.
   - `MainActivity.kt` and `MainApplication.kt` are the native entry points bridging Android lifecycle to React Native.
   - `AndroidManifest.xml`, `strings.xml`, `styles.xml`, and resource directories (`mipmap-*`, `drawable`) define app metadata, launch behavior, and platform UI assets.

5. **iOS subsystem**
   - The iOS host lives under `ios/` and is an Xcode/CocoaPods-managed React Native app.
   - `AppDelegate.swift` is the native startup bridge, while `Info.plist` and `LaunchScreen.storyboard` define app metadata and startup UI.
   - `Podfile` and the generated Xcode project wire native dependencies into the iOS build.

6. **Build and dependency toolchain**
   - The JavaScript layer is managed with **npm** (`package-lock.json`) and configured via `package.json`, `babel.config.js`, and `tsconfig.json`.
   - Android builds use **Gradle** (`android/build.gradle`, `android/app/build.gradle`), and iOS builds use **CocoaPods** plus Xcode project files.
   - `app.json` and `babel.config.js` are typical React Native scaffolding/config files rather than app-specific architecture components.

7. **Testing boundary**
   - Unit testing is set up with **Jest** (`jest.config.js`), and the existing test file `__tests__/App.test.tsx` targets the root app component.
   - This suggests tests are centered on rendering/behavior of the shared UI layer rather than platform-specific logic.

8. **Code quality and developer tooling**
   - Linting and formatting are configured via `.eslintrc.js` and `.prettierrc.js`.
   - `.watchmanconfig` supports efficient file watching for Metro on macOS development machines.
   - These tools affect the developer workflow but not runtime architecture.

9. **Native assets and platform resources**
   - iOS assets live in `ios/callmanager/Images.xcassets`, including the app icon set.
   - Android uses resource folders under `android/app/src/main/res` for launch icons, strings, and styles.
   - These assets are consumed by the native shells, not by the shared JS layer directly.

10. **Important architectural boundary**
   - The key boundary in this repo is between the **shared React Native app code** (`index.js`, `App.tsx`) and the **platform-specific native shells** (`android/`, `ios/`).
   - The shared layer owns the UI and app behavior; the native layers own startup, packaging, permissions, resources, and platform integration.
   - No additional subsystems such as networking, state management, persistence, or third-party service integration are visible in the current tree.

Main entry points: [`ios/callmanager/AppDelegate.swift`](https://github.com/mgdevloper/callmanager/blob/main/ios/callmanager/AppDelegate.swift) (AppDelegate), [`App.tsx`](https://github.com/mgdevloper/callmanager/blob/main/App.tsx) (App.tsx), [`metro.config.js`](https://github.com/mgdevloper/callmanager/blob/main/metro.config.js) (Metro), [`android/app/src/main/java/com/callmanager/MainActivity.kt`](https://github.com/mgdevloper/callmanager/blob/main/android/app/src/main/java/com/callmanager/MainActivity.kt) (MainActivity)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_group_shared["Shared app"]
  node_node_index["index.js<br/>rn entrypoint<br/>[index.js]"]
  node_node_app["App.tsx<br/>root UI<br/>[App.tsx]"]
  node_node_test_app["App test<br/>ui test<br/>[App.test.tsx]"]
end

subgraph group_group_android["Android host"]
  node_node_android_main["MainActivity<br/>android entry<br/>[MainActivity.kt]"]
  node_node_android_app["MainApplication<br/>android app<br/>[MainApplication.kt]"]
  node_node_android_manifest["AndroidManifest<br/>android manifest"]
  node_node_android_res[("Android resources<br/>android assets")]
  node_node_android_gradle["Gradle build<br/>android build<br/>[build.gradle]"]
end

subgraph group_group_ios["iOS host"]
  node_node_ios_delegate["AppDelegate<br/>ios entry<br/>[AppDelegate.swift]"]
  node_node_ios_info["Info.plist<br/>ios metadata<br/>[Info.plist]"]
  node_node_ios_launch["Launch screen<br/>ios ui"]
  node_node_ios_assets[("iOS assets<br/>[Images.xcassets]")]
  node_node_ios_pods["Podfile<br/>ios deps"]
  node_node_xcodeproj["Xcode project<br/>ios build<br/>[project.pbxproj]"]
end

subgraph group_group_tooling["Tooling"]
  node_node_metro{{"Metro<br/>bundler<br/>[metro.config.js]"}}
  node_node_jest{{"Jest<br/>test runner<br/>[jest.config.js]"}}
  node_node_pkg["package.json<br/>deps/scripts<br/>[package.json]"]
  node_node_babel{{"Babel<br/>transpiler<br/>[babel.config.js]"}}
  node_node_tsconfig["TS config<br/>typecheck<br/>[tsconfig.json]"]
end

node_node_index -->|"boots"| node_node_app
node_node_metro -->|"bundles"| node_node_index
node_node_metro -->|"serves"| node_node_app
node_node_babel -->|"transforms"| node_node_metro
node_node_tsconfig -.->|"checks"| node_node_app
node_node_pkg -->|"configures"| node_node_babel
node_node_pkg -->|"configures"| node_node_jest
node_node_jest -->|"runs"| node_node_test_app
node_node_android_main -->|"hosts"| node_node_app
node_node_android_app -->|"wires"| node_node_android_main
node_node_android_manifest -->|"declares"| node_node_android_main
node_node_android_gradle -->|"builds"| node_node_android_app
node_node_android_res -->|"supplies"| node_node_android_manifest
node_node_ios_delegate -->|"hosts"| node_node_app
node_node_ios_pods -->|"integrates"| node_node_xcodeproj
node_node_ios_info -->|"declares"| node_node_ios_delegate
node_node_ios_launch -->|"shows"| node_node_ios_delegate
node_node_ios_assets -->|"supplies"| node_node_ios_delegate
node_node_xcodeproj -->|"builds"| node_node_ios_delegate
node_node_android_res -.->|"bundled by"| node_node_android_gradle
node_node_ios_assets -.->|"included by"| node_node_xcodeproj

click node_node_index "https://github.com/mgdevloper/callmanager/blob/main/index.js"
click node_node_app "https://github.com/mgdevloper/callmanager/blob/main/App.tsx"
click node_node_metro "https://github.com/mgdevloper/callmanager/blob/main/metro.config.js"
click node_node_jest "https://github.com/mgdevloper/callmanager/blob/main/jest.config.js"
click node_node_test_app "https://github.com/mgdevloper/callmanager/blob/main/__tests__/App.test.tsx"
click node_node_pkg "https://github.com/mgdevloper/callmanager/blob/main/package.json"
click node_node_babel "https://github.com/mgdevloper/callmanager/blob/main/babel.config.js"
click node_node_tsconfig "https://github.com/mgdevloper/callmanager/blob/main/tsconfig.json"
click node_node_android_main "https://github.com/mgdevloper/callmanager/blob/main/android/app/src/main/java/com/callmanager/MainActivity.kt"
click node_node_android_app "https://github.com/mgdevloper/callmanager/blob/main/android/app/src/main/java/com/callmanager/MainApplication.kt"
click node_node_android_manifest "https://github.com/mgdevloper/callmanager/blob/main/android/app/src/main/AndroidManifest.xml"
click node_node_android_res "https://github.com/mgdevloper/callmanager/tree/main/android/app/src/main/res"
click node_node_android_gradle "https://github.com/mgdevloper/callmanager/blob/main/android/build.gradle"
click node_node_ios_delegate "https://github.com/mgdevloper/callmanager/blob/main/ios/callmanager/AppDelegate.swift"
click node_node_ios_info "https://github.com/mgdevloper/callmanager/blob/main/ios/callmanager/Info.plist"
click node_node_ios_launch "https://github.com/mgdevloper/callmanager/blob/main/ios/callmanager/LaunchScreen.storyboard"
click node_node_ios_assets "https://github.com/mgdevloper/callmanager/blob/main/ios/callmanager/Images.xcassets"
click node_node_ios_pods "https://github.com/mgdevloper/callmanager/tree/main/ios/Podfile"
click node_node_xcodeproj "https://github.com/mgdevloper/callmanager/blob/main/ios/callmanager.xcodeproj/project.pbxproj"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_node_index,node_node_app,node_node_test_app toneBlue
class node_node_android_main,node_node_android_app,node_node_android_manifest,node_node_android_res,node_node_android_gradle toneAmber
class node_node_ios_delegate,node_node_ios_info,node_node_ios_launch,node_node_ios_assets,node_node_ios_pods,node_node_xcodeproj toneMint
class node_node_metro,node_node_jest,node_node_pkg,node_node_babel,node_node_tsconfig toneRose
```

## Components

### Shared app

Cross-platform React Native code and testing

- [index.js](https://github.com/mgdevloper/callmanager/blob/main/index.js): rn entrypoint · Bootstraps React Native and registers the app root · `index.js`
- [App.tsx](https://github.com/mgdevloper/callmanager/blob/main/App.tsx): root UI · Top-level shared application component · `App.tsx`
- [App test](https://github.com/mgdevloper/callmanager/blob/main/__tests__/App.test.tsx): ui test · Validates the root app component · `__tests__/App.test.tsx`

### Android host

Android native shell and build system

- [MainActivity](https://github.com/mgdevloper/callmanager/blob/main/android/app/src/main/java/com/callmanager/MainActivity.kt): android entry · Android activity that hosts the React Native UI · `android/app/src/main/java/com/callmanager/MainActivity.kt`
- [MainApplication](https://github.com/mgdevloper/callmanager/blob/main/android/app/src/main/java/com/callmanager/MainApplication.kt): android app · Android application bootstrap and React Native integration · `android/app/src/main/java/com/callmanager/MainApplication.kt`
- [AndroidManifest](https://github.com/mgdevloper/callmanager/blob/main/android/app/src/main/AndroidManifest.xml): android manifest · Declares Android app metadata and startup behavior · `android/app/src/main/AndroidManifest.xml`
- [Android resources](https://github.com/mgdevloper/callmanager/tree/main/android/app/src/main/res): android assets · Platform strings, styles, icons, and drawable resources · `android/app/src/main/res`
- [Gradle build](https://github.com/mgdevloper/callmanager/blob/main/android/build.gradle): android build · Android build configuration and dependency wiring · `android/build.gradle`

### iOS host

iOS native shell and build system

- [AppDelegate](https://github.com/mgdevloper/callmanager/blob/main/ios/callmanager/AppDelegate.swift): ios entry · iOS startup bridge into React Native · `ios/callmanager/AppDelegate.swift`
- [Info.plist](https://github.com/mgdevloper/callmanager/blob/main/ios/callmanager/Info.plist): ios metadata · iOS app metadata and permissions configuration · `ios/callmanager/Info.plist`
- [Launch screen](https://github.com/mgdevloper/callmanager/blob/main/ios/callmanager/LaunchScreen.storyboard): ios ui · Initial iOS launch UI · `ios/callmanager/LaunchScreen.storyboard`
- [iOS assets](https://github.com/mgdevloper/callmanager/blob/main/ios/callmanager/Images.xcassets): ios assets · App icon and asset catalog resources · `ios/callmanager/Images.xcassets`
- [Podfile](https://github.com/mgdevloper/callmanager/tree/main/ios/Podfile): ios deps · CocoaPods dependency definition for the iOS host · `ios/Podfile`
- [Xcode project](https://github.com/mgdevloper/callmanager/blob/main/ios/callmanager.xcodeproj/project.pbxproj): ios build · Native project wiring for the iOS app target · `ios/callmanager.xcodeproj/project.pbxproj`

### Tooling

Repo configuration for bundling, linting, and testing

- [Metro](https://github.com/mgdevloper/callmanager/blob/main/metro.config.js): bundler · Builds and serves the JavaScript bundle during development · `metro.config.js`
- [Jest](https://github.com/mgdevloper/callmanager/blob/main/jest.config.js): test runner · Runs unit tests for the shared app layer · `jest.config.js`
- [package.json](https://github.com/mgdevloper/callmanager/blob/main/package.json): deps/scripts · JavaScript package metadata and scripts · `package.json`
- [Babel](https://github.com/mgdevloper/callmanager/blob/main/babel.config.js): transpiler · Transpiles TypeScript/JavaScript for React Native · `babel.config.js`
- [TS config](https://github.com/mgdevloper/callmanager/blob/main/tsconfig.json): typecheck · TypeScript compiler settings for the shared code · `tsconfig.json`

## Connections

- index.js → App.tsx: boots · Registers and launches the root shared component
- Metro → index.js: bundles · Feeds the entrypoint into the JavaScript bundle
- Metro → App.tsx: serves · Delivers updated app code during development
- Babel → Metro: transforms · Provides JavaScript/TypeScript transpilation for the bundle
- TS config → App.tsx: checks · Configures type checking for the shared application code
- package.json → Babel: configures · Defines scripts and dependencies used by the JS toolchain
- package.json → Jest: configures · Declares test scripts and runtime dependencies
- Jest → App test: runs · Executes the app component test
- MainActivity → App.tsx: hosts · Bridges Android lifecycle into the shared React Native UI
- MainApplication → MainActivity: wires · Sets up the Android application and React Native runtime
- AndroidManifest → MainActivity: declares · Provides Android launch and app metadata
- Gradle build → MainApplication: builds · Compiles and packages the Android host app
- Android resources → AndroidManifest: supplies · Provides icons, strings, and styles consumed by Android
- AppDelegate → App.tsx: hosts · Starts the shared app inside the iOS shell
- Podfile → Xcode project: integrates · Links CocoaPods dependencies into the Xcode project
- Info.plist → AppDelegate: declares · Provides iOS metadata and runtime settings
- Launch screen → AppDelegate: shows · Defines the launch screen displayed before app startup
- iOS assets → AppDelegate: supplies · Provides app icons and catalog assets used by iOS
- Xcode project → AppDelegate: builds · Compiles and packages the iOS host app
- Android resources → Gradle build: bundled by · Included as part of the Android build output
- iOS assets → Xcode project: included by · Added to the native iOS target resources