- pnpm add maplibre-google-maps (runtime; lazy-imported on Google use).
- src/map/core/styles.ts: BasemapDescriptor model with four entries
(Esri Satellite / OpenTopoMap / OSM / Google Satellite).
Google entry gated on cfg.googleMapsKey via available(cfg).
styleCustom() builds a single-raster-source MapLibre style with a
glyphs URL for future label rendering.
ensureGoogleProtocol() lazy-loads maplibre-google-maps + addProtocol
on first use; _googleRegistered guards re-registration.
- src/map/core/map-pref-store.ts: Zustand + persist middleware
(key: trm-map-prefs, version: 1). Holds basemapId + setBasemap.
- src/map/core/basemap-switcher.tsx: floating control top-right of
<MapView>. Filters by available(cfg), highlights active, applies via
getMap().setStyle(). Mount-time bootstrap (no UI state) + user-driven
onClick (with switching state) split to satisfy React 19's
react-hooks/set-state-in-effect rule.
- src/routes/_authed/monitor.tsx: renders <BasemapSwitcher /> as a
child of <MapView>.
- src/vite-env.d.ts: ambient module declaration for
maplibre-google-maps (no .d.ts ships in the package).
Deviations:
- BasemapDescriptor.style is buildStyle(cfg): StyleSpecification, not
the spec's StyleSpecification|string union. Google needs the cfg key
at build time; uniform function shape across all entries is cleaner.
- Bootstrap apply path doesn't use the switching UI state (no visual
feedback needed during the silent first-paint flip from OSM to user
preference). User-click path keeps setSwitching for the in-flight
indicator.
Bundle: MapLibre is now its own chunk (1MB / 273KB gz), shared across
maplibre consumers. Main bundle 371KB / 114KB gz.
