Tech stack

Versions and roles of every major dependency.

Everything in package.json, grouped by what it does.

Framework & runtime

Package	Version	Role
next	16.1.1	App Router framework
react / react-dom	19.2.3	UI
typescript	5.9.3	Type safety

Database

Package	Version	Role
pg	8.20.0	Postgres driver
@google-cloud/cloud-sql-connector	1.9.1	Secure auth to Cloud SQL
@types/pg	8.18.0	Type definitions

State & data

Package	Version	Role
@tanstack/react-query	5.90.14	Client cache (5-min stale)
xlsx	0.18.5	Excel parsing

UI primitives

Package	Version	Role
@radix-ui/react-select	2.2.6	Dropdowns
@radix-ui/react-tabs	1.1.13	Tabbed pages (methodology)
@radix-ui/react-separator	1.1.8	Dividers
@radix-ui/react-slot	1.2.4	Composition
lucide-react	0.562.0	Icons

Charts & maps

Package	Version	Role
recharts	3.6.0	CII gauge, distribution, rolling charts, daily timelines
leaflet + react-leaflet	1.9.4 / 5.0.0	Voyage map (fallback)
maplibre-gl + react-map-gl	4.7.1 / 7.1.7	Voyage map (primary)

Styling

Package	Version	Role
tailwindcss	4	Utility classes
@tailwindcss/postcss	4	Build integration
tw-animate-css	1.4.0	Animation utilities
class-variance-authority	0.7.1	Component variants
clsx / tailwind-merge	2.1.1 / 3.4.0	Class composition

PDF generation

Package	Version	Role
jspdf	4.1.0	PDF rendering for reports
jspdf-autotable	5.0.7	Tabular data in PDFs

Tooling

Package	Version	Role
eslint + eslint-config-next	9 / 16.1.1	Linting (flat config)
@typescript-eslint/*	8.51.0	TypeScript linting

Notable absences

• No test framework. No Jest, Vitest, or Playwright in the repo. Type checking and linting catch most issues.
• No state library. No Redux, Zustand, etc. React Query handles all server state; React Context handles year + vessel selection.
• No CSS-in-JS. Pure Tailwind.
• No ORM. Plain pg queries via helper functions in src/lib/db/postgres.ts.