A3 Build System Reference

Stack

Tool	Purpose
Vite 7	Dev server & bundler
Embroider 4	Ember-to-Vite bridge
Babel	JavaScript/TypeScript transformation
TypeScript 5	Type checking
Tailwind via @tailwindcss/vite	CSS processing
VitePWA	Progressive Web App support

Vite Configuration

// vite.config.mjs
import { defineConfig } from 'vite';
import { embroider } from '@embroider/vite';
import tailwindcss from '@tailwindcss/vite';
import { VitePWA } from 'vite-plugin-pwa';

export default defineConfig({
  plugins: [
    embroider(),
    tailwindcss(),
    VitePWA({ /* PWA config */ }),
  ],
});

Embroider (Ember Build System)

Embroider is the modern build pipeline that converts Ember apps to standard Vite/webpack builds.

Key Features Used

• Route splitting: Admin, authenticated, and login routes are lazy-loaded
• Tree shaking: Unused code is removed from production builds
• Static analysis: Templates are compiled statically for better optimization

Route Splitting

// ember-cli-build.js
const app = new EmberApp(defaults, {
  // Embroider configuration
});

return require('@embroider/compat').compatBuild(app, {
  splitAtRoutes: ['admin', 'authenticated', 'login'],
});

This means:

• /admin/* routes load their own JS bundle
• /a3/* (authenticated) routes load their own JS bundle
• /login routes load their own JS bundle
• Faster initial page load — only loads what's needed

TypeScript Configuration

// tsconfig.json
{
  "compilerOptions": {
    "target": "ESNext",
    "module": "ESNext",
    "moduleResolution": "bundler",
    "strict": true,
    "noEmit": true,
    "declaration": true,
    "declarationDir": "declarations",
    "experimentalDecorators": true,
    "emitDecoratorMetadata": false
  },
  "include": ["app/**/*", "types/**/*", "tests/**/*"]
}

Key TypeScript Settings

• strict: true — Full strict mode
• experimentalDecorators: true — Required for Ember decorators
• moduleResolution: "bundler" — Modern module resolution

Babel Configuration

// babel.config.cjs
module.exports = {
  plugins: [
    ['@babel/plugin-transform-typescript', { allowDeclareFields: true }],
    '@babel/plugin-transform-runtime',
    'decorator-transforms',
    'babel-plugin-ember-template-compilation',
  ],
};

Key Plugins

• decorator-transforms: Handles @tracked, @action, @service decorators
• ember-template-compilation: Compiles GTS/GJS templates

PWA Support

Via vite-plugin-pwa, A3 can work as a Progressive Web App:

• Service worker for offline support
• App manifest for install-to-home-screen
• Cache strategies for assets

Code Quality Tools

ESLint (v9)

// eslint.config.mjs
import ember from 'eslint-plugin-ember';
import typescript from 'typescript-eslint';

export default [
  ...ember.configs['recommended'],
  ...typescript.configs['recommended'],
  { rules: { /* custom rules */ } },
];

Prettier

// .prettierrc.mjs
export default {
  singleQuote: true,
  trailingComma: 'all',
  printWidth: 100,
};

Stylelint

// .stylelintrc.cjs
module.exports = {
  extends: [
    'stylelint-config-standard',
    'stylelint-config-tailwindcss',
  ],
};

Template Lint

// .template-lintrc.mjs
export default {
  extends: 'recommended',
  rules: { /* custom template rules */ },
};

Development Commands

Command	Purpose
ember serve / vite dev	Start dev server
ember test	Run tests
ember build --environment production	Production build
firebase emulators:start	Start Firebase emulator
firebase deploy --only functions	Deploy Cloud Functions
firebase deploy --only firestore:rules	Deploy Firestore rules

Further Investigation

• Embroider: https://github.com/embroider-build/embroider
• Vite: https://vitejs.dev/
• VitePWA: https://vite-pwa-org.netlify.app/