@math.gl/proj4
Proj4js wrapper for conversion between geospatial CRS (coordinate reference systems)
gis-tools-ts
A collection of geospatial tools primarily designed for WGS84, Web Mercator, and S2.
swiss-projection
Convert from LV03(EPSG:21781) and LV95(EPSG:2056) to WGS84(EPSG:4326)