Class CrsAPI

const crsToCreate = [{
 srid: 456789,
 wkt: 'GEOGCS[\"WGS 84\",DATUM[\"WGS_1984\",SPHEROID[\"WGS 84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY[\"EPSG\",\"6326\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.0174532925199433,AUTHORITY[\"EPSG\",\"9122\"]],AUTHORITY[\"EPSG\",\"4326\"]]',
 projString: '+proj=longlat +datum=WGS84 +no_defs \"\"'
 }];

const createdCRS = await client.geospatial.crs.create(crsToCreate);

await client.geospatial.crs.delete([{ srid: 4326}]);

const allCRS = await client.geospatial.crs.list({ filterOnlyCustom : true });

const retrievedCRS = await client.geospatial.crs.retrieve([{ srid: 4326 }]);