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OnlyMapJS lets you register your own basemap styles and switch between them using React or the built-in widget for basemaps.
Try it today: OnlyMapJS on npm at @nika-js/onlymap
npm install @nika-js/onlymap

This map needs JavaScript.
Open this file in a web browser such as Chrome, Safari, or Firefox.

Custom MapTiler basemaps
Add a free MapTiler key (maptiler.com) as ?key=..., or paste it here for local testing.
Four looks from two fetched MapTiler bases (dataviz-dark + streets-v2), patched four different ways in plain JS.