DoU

A full-stack, cross-platform messaging & community app built with React, React Native, and Nx

Getting Started · Architecture · Contributing

Overview

DoU is an Nx monorepo powering a real-time messaging and community platform across 8 applications and 16 shared libraries — web, mobile, desktop, and admin interfaces from a single codebase.

App	Description	Stack
Web	Main user-facing web app	React 19 + Vite + Tailwind CSS
Admin V2	Admin dashboard	React 19 + Vite + Tailwind CSS
Mobile	iOS & Android native app — WebView shell around Web	React Native 0.83 + WebView bridge
Landing	Marketing site, policy pages & invite-link bounce page	React 19 + Vite
Desktop	Electron shell around Desktop Web	Electron + electron-vite
Desktop Web	Web client rendered inside the Desktop Electron shell	React 19 + Vite + Tailwind CSS
Block Kit Builder	Visual editor for `@chatic/block-kit` message blocks	React 19 + Vite + Tailwind CSS
Testbed	Experimental app for validating data/config/socket flows	React 19 + Vite + Tailwind CSS

Table of Contents

Overview
Key Features
Tech Stack
Architecture
Getting Started
Development
Building & Deployment
Mobile Development
Environment Variables
CI/CD
Code Quality
Contributing
License

Key Features

Real-time messaging via WebSocket with optimistic updates
Multi-provider auth — OAuth, Apple Sign-In, Google Sign-In
Push notifications — Firebase Cloud Messaging (iOS & Android)
In-App Purchases — iOS & Android subscription management
Places — Location-based community features
Deep linking — iOS Universal Links & Android App Links
Theming — Dark / light mode with system preference detection
i18n — Multi-language support with auto-detection
29 UI components — Built on Radix UI primitives (shadcn/ui)

Tech Stack

Category	Technology
Framework	React 19.2, React Native 0.83
Language	TypeScript 5.9 (strict mode)
Build	Vite 7, Metro, Nx 22
Styling	Tailwind CSS 3.4, Radix UI (shadcn/ui)
State	Zustand 5, TanStack Query 5
Routing	React Router 6, React Navigation 7
Forms	React Hook Form 7
i18n	i18next 25
Testing	Vitest 4, Jest 30, Testing Library
Code Quality	ESLint 9, Prettier, Husky, Commitlint

Architecture

graph TB
    subgraph Apps
        WEB["apps/web<br/>React Web App<br/><i>:5003</i>"]
        ADMINV2["apps/admin-v2<br/>Admin Dashboard<br/><i>:5001</i>"]
        LANDING["apps/landing<br/>Landing Page<br/><i>:5004</i>"]
        DESKWEB["apps/desktop-web<br/>Desktop Web Client<br/><i>:5005</i>"]
        BKB["apps/block-kit-builder<br/>Block Kit Builder<br/><i>:5006</i>"]
        TESTBED["apps/testbed<br/>Experimental App"]
        MOBILE["apps/mobile<br/>React Native shell"]
        DESKTOP["apps/desktop<br/>Electron shell"]
    end

    subgraph Core["Core Libraries"]
        DATA["data<br/>Headless Data Layer"]
        HTTP["http<br/>Request Execution & Policy"]
        CONFIG["config<br/>Runtime Settings"]
        UIKIT["ui-kit<br/>29 Radix/shadcn Components"]
        SHARED["shared<br/>Utils & Hooks"]
        THEME["theme<br/>Dark / Light Mode"]
    end

    subgraph Native["Native Bridge Libraries"]
        RUNTIME["app-runtime<br/>Session & Runtime"]
        BRIDGES["bridges<br/>WebView Transport"]
        APPMSG["app-messages<br/>Bridge Message Vocabulary"]
        DEVICE["device-utils<br/>Injected Device Info"]
        DB["db<br/>Cache Storage Engines"]
        LOGGER["logger<br/>Cross-Platform Logging"]
        AUTHSIGN["auth-sign<br/>HMAC Request Signing"]
    end

    MOBILE --> BRIDGES & APPMSG
    DESKTOP --> DESKWEB
    WEB --> DATA & UIKIT & SHARED & THEME & CONFIG
    WEB --> RUNTIME & BRIDGES & DEVICE
    DESKWEB --> DATA & UIKIT & SHARED & THEME & RUNTIME
    ADMINV2 --> DATA & UIKIT & SHARED & THEME
    RUNTIME --> DATA & HTTP & AUTHSIGN
    DATA --> DB & HTTP

Project Structure

dou-app/
├── apps/
│   ├── web/                 # Main web application (port 5003)
│   ├── admin-v2/            # Admin dashboard (port 5001)
│   ├── landing/             # Marketing site & policy pages (port 5004)
│   ├── desktop-web/         # Web client for the Desktop shell (port 5005)
│   ├── block-kit-builder/   # Block Kit visual editor (port 5006)
│   ├── testbed/             # Experimental app for data/config/socket flows
│   ├── mobile/              # React Native app (iOS + Android)
│   │   ├── android/
│   │   ├── ios/
│   │   └── src/
│   └── desktop/             # Electron shell (hosts desktop-web)
├── libs/
│   ├── data/                # Headless data layer (models, cache, repositories)
│   ├── db/                  # Cache storage engines (IndexedDB / native SQLite)
│   ├── http/                # Request execution, retry & logging policy
│   ├── config/              # Runtime settings facade
│   ├── app-runtime/         # Session, sockets, repositories, sync runtimes
│   ├── bridges/             # WebView transport between web and native shell
│   ├── app-messages/        # Bridge message vocabulary (web <-> native)
│   ├── device-utils/        # Injected device info, reader hooks
│   ├── auth-sign/           # Lemon HMAC request signing
│   ├── logger/              # Cross-platform logging core
│   ├── policy-content/      # Legal text (terms, privacy, child safety)
│   ├── block-kit/           # Message block model consumed by block-kit-builder
│   ├── ui-kit/              # Generic UI components (shadcn/ui)
│   ├── web-ui-kit/          # Mobile-web design system components
│   ├── shared/              # Common utilities and hooks
│   └── theme/               # Theme provider (dark/light)
├── assets/                  # Shared images, logos, icons
├── scripts/                 # Build and deployment scripts
├── docs/                    # ADRs (docs/adr/) and infra config (docs/infra/)
└── .github/workflows/       # CI/CD pipelines

State Management Pattern

Server state — TanStack Query for caching, background refetching, and optimistic updates
Client state — Zustand stores for auth, theme, device info, and UI state
Local state — React useState / useReducer for component-scoped data

Mobile Architecture

The mobile app uses a WebView + Native Bridge pattern:

React Native shell provides native capabilities (push notifications, IAP, contacts, camera)
Web app runs inside a WebView
A bridge layer enables bidirectional communication between native and web

Shared Library System

All apps share code through @chatic/* path aliases:

import { runtime } from '@chatic/app-runtime';
import { Button } from '@chatic/ui-kit';
import { config } from '@chatic/config';
import { ThemeProvider } from '@chatic/theme';

Before editing a lib, read its own README.md — each one documents what it owns and, where a decision's reasoning matters, links back to the ADR that made it (see docs/adr/).

Getting Started

Prerequisites

Tool	Version	Notes
Node.js	v22.15.1	Use `nvm use` — `.nvmrc` is included
Yarn	1.x	Classic Yarn
Xcode	Latest	For iOS development
Android Studio	Latest	For Android development
CocoaPods	Latest	For iOS dependencies
Ruby	3.2.9	For CocoaPods — `.ruby-version` is included

Installation

# Clone the repository
git clone https://github.com/lemoncloud-io/dou-app.git
cd dou-app

# Use the correct Node version
nvm use

# Install dependencies
yarn install

Environment Setup

Full checklist — which .env files, Firebase config, and (for release builds only) signing credentials a fresh checkout needs — lives in ONBOARDING.md.

Warning

Environment files (.env) must exist before building. The app will not start without them.

Development

# Web app
yarn web:start                # http://localhost:5003

# Admin dashboard
yarn admin-v2:start           # http://localhost:5001

# Landing page
yarn landing:start            # http://localhost:5004

# Desktop web client (served standalone, or hosted by the Desktop shell)
yarn desktop-web:start        # http://localhost:5005

# Block Kit Builder
yarn block-kit-builder:start  # http://localhost:5006

# Testbed (experimental app)
yarn testbed:start

# Desktop — Electron shell + its web client, in one command
yarn desktop:start            # deployed desktop-web build
yarn desktop:start:local      # local desktop-web dev server

# Mobile — Local run: web dev server + Metro + the app, in one command
yarn mobile:ios:local         # iOS Simulator, WebView -> http://localhost:5003
yarn mobile:android:local     # Android Emulator, same address via `adb reverse`

# Mobile — Start Metro bundler only
yarn mobile:start

# Mobile — Run against the deployed web (dev/prod)
yarn mobile:ios:dev           # iOS Simulator
yarn mobile:android:dev       # Android Emulator

Note

mobile:*:local needs apps/mobile/.env (the LOCAL env — same meaning as in web). Copy it once with cp apps/mobile/.env.example apps/mobile/.env. See apps/mobile/docs/release/local-run.md.

Tip

Run npx nx graph to visualize the dependency graph of all apps and libraries.

Building & Deployment

Build

# Build individual apps
yarn web:build:dev              # Development build
yarn web:build:prod             # Production build
yarn admin-v2:build:dev
yarn admin-v2:build:prod
yarn landing:build:dev
yarn landing:build:prod
yarn desktop-web:build:dev
yarn desktop-web:build:prod
yarn block-kit-builder:build:dev
yarn block-kit-builder:build:prod
yarn desktop:build               # Electron shell

# Build all apps at once
yarn build:all:dev
yarn build:all:prod

Deploy

Deployment uses AWS S3 + CloudFront. Required environment variables:

Variable	Description
`DEPLOY_BUCKET_NAME`	S3 bucket name
`DEPLOY_DEV_CF_DISTRIBUTION_ID`	CloudFront distribution ID (dev)
`DEPLOY_PROD_CF_DISTRIBUTION_ID`	CloudFront distribution ID (prod)

yarn web:deploy:dev              # Deploy web to dev
yarn web:deploy:prod             # Deploy web to prod
yarn admin-v2:deploy:dev
yarn admin-v2:deploy:prod
yarn landing:deploy:dev
yarn landing:deploy:prod
yarn desktop-web:deploy:dev
yarn desktop-web:deploy:prod
yarn block-kit-builder:deploy:dev
yarn block-kit-builder:deploy:prod

# Desktop is packaged, not deployed to S3/CloudFront
yarn desktop:package:mac:dev
yarn desktop:package:mac:prod:signed
yarn desktop:package:win:dev
yarn desktop:package:win:prod

Important

desktop-web only deploys automatically on push to develop/main — force-deploy.yml (manual redeploy/rollback) covers Web, Admin V2 and Landing only. The Desktop Electron shell loads desktop-web from a remote URL at runtime, so a desktop-web deploy reaches every running Desktop user immediately, and the only way back is a revert commit pushed through the same pipeline.

Mobile Development

iOS Commands

Command	Description
`yarn mobile:pod`	Install CocoaPods dependencies
`yarn mobile:ios:local`	Local run against the web dev server
`yarn mobile:ios:dev`	Run dev build on iPhone Simulator
`yarn mobile:ios:prod`	Run prod build on iPhone Simulator
`yarn mobile:ios:dev:device`	Run dev build on physical device
`yarn mobile:ios:dev:release`	Release dev build on Simulator
`yarn mobile:ios:dev:release:device`	Release dev build on device
`yarn mobile:ios:prod:release`	Release prod build on Simulator
`yarn mobile:ios:prod:release:device`	Release prod build on device
`yarn mobile:ios:clean`	Clean iOS build artifacts

Android Commands

Command	Description
`yarn mobile:android:local`	Local run against the web dev server
`yarn mobile:android:dev`	Run dev build on emulator
`yarn mobile:android:prod`	Run prod build on emulator
`yarn mobile:android:build:apk:dev`	Build dev APK
`yarn mobile:android:build:apk:prod`	Build prod APK
`yarn mobile:android:build:aab:dev`	Build dev AAB (Play Store)
`yarn mobile:android:build:aab:prod`	Build prod AAB (Play Store)
`yarn mobile:android:install:dev`	Install dev APK via ADB
`yarn mobile:android:install:prod`	Install prod APK via ADB
`yarn mobile:android:clean`	Clean Android build artifacts

Mobile Platform Support

Platform	Min Version	Target
Android	SDK 24 (Android 7.0)	SDK 36 (Android 15)
iOS	See Xcode project	Latest

Environment Variables

Web (apps/web/.env)

Variable	Description
`VITE_ENV`	Environment (`LOCAL`, `DEV`, `PROD`)
`VITE_PROJECT`	Project identifier
`VITE_HOST`	App host URL
`VITE_OAUTH_ENDPOINT`	OAuth API endpoint
`VITE_SOCIAL_OAUTH_ENDPOINT`	Social OAuth endpoint
`VITE_IMAGE_API_ENDPOINT`	Image API endpoint
`VITE_BACKEND_ENDPOINT`	Backend API endpoint
`VITE_WS_ENDPOINT`	WebSocket endpoint
`VITE_DOU_ENDPOINT`	DoU API endpoint
`VITE_SOC_ENDPOINT`	Social API endpoint

Admin V2 (apps/admin-v2/.env)

Variable	Description
`VITE_ENV`	Environment (`LOCAL`, `DEV`, `PROD`)
`VITE_PROJECT`	Project identifier
`VITE_HOST`	App host URL
`VITE_OAUTH_ENDPOINT`	OAuth API endpoint
`VITE_SOCIAL_OAUTH_ENDPOINT`	Social OAuth endpoint
`VITE_IMAGE_API_ENDPOINT`	Image API endpoint
`VITE_BACKEND_ENDPOINT`	Backend API endpoint
`VITE_WS_ENDPOINT`	WebSocket endpoint
`VITE_DOU_ENDPOINT`	DoU API endpoint
`VITE_FRONT_ENDPOINT`	Frontend URL for cross-linking
`VITE_FIREBASE_*`	Firebase web config (7 keys)

Desktop Web / Testbed / Block Kit Builder

Same shape as Web's VITE_* variables (apps/desktop-web/.env, apps/testbed/.env, apps/block-kit-builder/.env — each has its own .env.example). desktop-web additionally reads VITE_SOC_ENDPOINT, VITE_IAP_ENDPOINT and VITE_DEBUG_CODE; testbed mirrors Admin V2's VITE_FRONT_ENDPOINT for cross-linking.

Mobile (apps/mobile/.env)

.env is the LOCAL env, .env.dev / .env.prod are the built ones — the same split web uses. Which file a build reads is decided by the build configuration (iOS ENVFILE build setting, Android envConfigFiles), not by the script. See apps/mobile/docs/release/local-run.md.

Variable	Description
`VITE_ENV`	Environment (`LOCAL`, `DEV`, `PROD`)
`VITE_WEBVIEW_BASE_URL`	WebView base URL
`VITE_WS_ENDPOINT`	Unused — no code reads it
`VITE_SUBSCRIPTION_IAP_SKUS_IOS`	iOS IAP product SKUs
`VITE_SUBSCRIPTION_IAP_SKUS_ANDROID`	Android IAP product SKUs
`VITE_SUBSCRIPTION_IAP_PLANS_ANDROID`	Android IAP plan IDs
`VIEW_APP_NAME`	Display app name
`VITE_GOOGLE_WEB_CLIENT_ID`	Google OAuth web client ID
`ANDROID_KEYSTORE_FILE`	Android keystore file path
`ANDROID_KEYSTORE_PASSWORD`	Android keystore password
`ANDROID_KEY_ALIAS`	Android key alias
`ANDROID_KEY_PASSWORD`	Android key password

CI/CD

Workflow	Trigger	Description
`verify.yml`	Pull requests, push to `develop`	Doc links, doc language, code comment language, lint, typecheck & test — only the projects listed as covered; excluded projects are named at the bottom of the file with the reason
`deploy-dev.yml`	Push to `develop`	Auto-detect changed apps, build & deploy to dev
`deploy-prod.yml`	Push to `main`	Build, deploy to prod & create a GitHub release
`force-deploy.yml`	Manual dispatch	Force (re)deploy Web / Admin V2 / Landing to dev or prod — no other app
`build-desktop.yml`	Manual dispatch	Build unsigned macOS `.dmg` + Windows `.exe` installers, publish to a rolling `desktop-dev` / `desktop-prod` GitHub Release
`build-desktop-win.yml`	Manual dispatch	Windows-only variant of the above

deploy-dev/deploy-prod auto-detect which apps changed and only build/deploy the affected ones — this is the only path that ships desktop-web (see the note in Building & Deployment). verify.yml was added later than the rest; before it, nothing in CI ran a type check or a test.

Code Quality

# Lint
yarn lint                   # Check for issues
yarn lint:fix               # Auto-fix issues
yarn check:undefined-names  # Fail on TS2304 — a name used but never imported; run after moving symbols
yarn check:doc-links        # Fail on a dead markdown link, or an ADR link whose label and target disagree
yarn check:doc-korean       # Fail on untranslated Korean prose in a markdown file (AGENTS.md's English policy)
yarn check:code-korean      # Fail on untranslated Korean prose in a source code comment (same policy)

# Format
yarn prettier               # Format all files
yarn prettier:staged        # Format staged files only

# Test
npx nx test web             # Test specific project
npx nx test                 # Run all tests
yarn desktop:test:sandbox   # Electron preload under sandbox — run when touching apps/desktop/src/preload

# Cache
yarn clean:cache            # Clear Vite/Nx caches

Pre-commit hooks (via Husky) automatically run linting and formatting on staged files. Commit messages are enforced with Conventional Commits via Commitlint.

yarn check:undefined-names is deliberately outside those hooks — it type-checks every buildable project (an app or lib with a tsconfig.app.json/tsconfig.lib.json, 23 today) and takes about 20 seconds, which is too slow per commit. Run it yourself after any change that moves or extracts a symbol. It catches what nothing else here can: ESLint disables no-undef on TypeScript files, Vite strips types without resolving free identifiers, and a test only sees the error if something renders that line. Pass a project name to narrow it (yarn check:undefined-names desktop-web).

Contributing

Fork the repository
Create your feature branch (git checkout -b feature/amazing-feature)
Commit your changes using Conventional Commits (git commit -m 'feat: add amazing feature')
Push to the branch (git push origin feature/amazing-feature)
Open a Pull Request

License

This project is licensed under the Apache License 2.0. See the LICENSE file for details.

Name		Name	Last commit message	Last commit date
.amazonq/rules		.amazonq/rules
.github		.github
.husky		.husky
.vscode		.vscode
apps		apps
assets		assets
docs		docs
libs		libs
scripts		scripts
.editorconfig		.editorconfig
.gitignore		.gitignore
.lintstagedrc		.lintstagedrc
.nvmrc		.nvmrc
.prettierignore		.prettierignore
.prettierrc		.prettierrc
.ruby-version		.ruby-version
AGENTS.md		AGENTS.md
CHANGELOG.md		CHANGELOG.md
CLAUDE.md		CLAUDE.md
CONTEXT.md		CONTEXT.md
DESIGN.md		DESIGN.md
LICENSE		LICENSE
ONBOARDING.md		ONBOARDING.md
README.md		README.md
commitlint.config.js		commitlint.config.js
components.json		components.json
eslint.config.mjs		eslint.config.mjs
jest.config.ts		jest.config.ts
jest.preset.js		jest.preset.js
nx.json		nx.json
package.json		package.json
tsconfig.base.json		tsconfig.base.json
tsconfig.json		tsconfig.json
vitest.workspace.ts		vitest.workspace.ts
yarn.lock		yarn.lock

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DoU

Overview

Key Features

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Architecture

Project Structure

State Management Pattern

Mobile Architecture

Shared Library System

Getting Started

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Building & Deployment

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Mobile Development

Mobile Platform Support

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DoU

Overview

Key Features

Tech Stack

Architecture

Project Structure

State Management Pattern

Mobile Architecture

Shared Library System

Getting Started

Prerequisites

Installation

Environment Setup

Development

Building & Deployment

Build

Deploy

Mobile Development

Mobile Platform Support

Environment Variables

CI/CD

Code Quality

Contributing

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