Local development

Prerequisites

Node.js 20 or 22 (LTS)
Access to the Google Cloud SQL instance + a service account JSON
npm (the repo uses npm, not pnpm or yarn)

Setup

git clone <repo>
cd <project-folder>
npm install

Configure

Create .env.local at the repo root with the variables documented in Environment variables. Minimum:

POSTGRES_USER=...
POSTGRES_PASSWORD=...
POSTGRES_DB=...
CLOUD_SQL_INSTANCE_CONNECTION_NAME=...
GOOGLE_SERVICE_ACCOUNT_BASE64=...

Run

npm run dev          # Dev server on http://localhost:3000
npm run build        # Production build (use to verify TypeScript)
npm run lint         # ESLint (flat config)
npm start            # Run the production build

The dev script is hardcoded to port 3000 (next dev --port 3000). To run on another port — e.g. for screenshot capture — bypass the npm script:

npx next dev --port 3001

No tests

There’s no test framework configured. CI relies on npm run build and npm run lint to catch issues.

Project layout

src/
├── app/                     # Next.js App Router routes
│   ├── api/                 # API route handlers
│   ├── (pages)/             # User-facing pages
│   └── layout.tsx           # Root layout with FloatingNav
├── components/
│   ├── dashboard/           # Domain components
│   └── ui/                  # Radix-based primitives
├── hooks/
│   └── useFleet.ts          # React Query hooks
├── lib/
│   ├── api.ts               # Typed fetch helpers
│   ├── db/                  # Postgres connection + table names
│   ├── models/              # TypeScript interfaces
│   ├── services/            # Business logic (FleetService, etc.)
│   └── utils/               # Calculators (CII, FuelEU, ports, Excel)
└── contexts/                # YearContext, VesselContext

Path alias

@/* maps to src/*. Imports look like:

import { calculateCII } from '@/lib/utils/ciiCalculator'

Configured in tsconfig.json and next.config.ts.

Where to make changes

Change	File(s)
Adjust a CII rating boundary	`src/lib/utils/ciiCalculator.ts`
Add a fuel type	`src/lib/utils/fuelEUCalculator.ts`
Add an EU country	`src/lib/utils/portClassifier.ts`
Update a regulation phase-in	Same files; usually one constant
Add a new report	`src/lib/services/ReportExportService.ts` + `src/app/api/reports/...`
Add a new dashboard view	`src/app/<route>/page.tsx` + `client.tsx` + new component in `src/components/dashboard/`