GDM 2000 Selangor - EPSG:3380

WKT

PROJCS["GDM_2000_State_Cassini_Selangor", 
	GEOGCS["GCS_GDM_2000", 
		DATUM["D_GDM_2000", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Cassini"], 
	PARAMETER["False_Easting", -34836.161], 
	PARAMETER["False_Northing", 56464.049], 
	PARAMETER["Central_Meridian", 101.3891079138889], 
	PARAMETER["Scale_Factor", 1.0], 
	PARAMETER["Latitude_Of_Origin", 3.68464905], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["GDM_2000_State_Cassini_Selangor", 
	BASEGEOGCRS["GCS_GDM_2000", 
		DATUM["D_GDM_2000", 
			ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	CONVERSION["Cassini", 
		METHOD["Cassini"], 
		PARAMETER["False_Easting", -34836.161], 
		PARAMETER["False_Northing", 56464.049], 
		PARAMETER["Central_Meridian", 101.3891079138889], 
		PARAMETER["Scale_Factor", 1.0], 
		PARAMETER["Latitude_Of_Origin", 3.68464905]], 
	CS[Cartesian, 2], 
	AXIS["Easting (X)", east, 
		ORDER[1]], 
	AXIS["Northing (Y)", north, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["EPSG", "3380"]]

Data from @esri/proj-codes

{
  "wkid": 3380,
  "latestWkid": 3380,
  "gcsWkid": 4742,
  "macro": "PE_PCS_GDM_2000_STATE_CASSINI_SELANGOR",
  "name": "GDM_2000_State_Cassini_Selangor",
  "wkt": "PROJCS[\"GDM_2000_State_Cassini_Selangor\",GEOGCS[\"GCS_GDM_2000\",DATUM[\"D_GDM_2000\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Cassini\"],PARAMETER[\"False_Easting\",-34836.161],PARAMETER[\"False_Northing\",56464.049],PARAMETER[\"Central_Meridian\",101.3891079138889],PARAMETER[\"Scale_Factor\",1.0],PARAMETER[\"Latitude_Of_Origin\",3.68464905],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"GDM_2000_State_Cassini_Selangor\",BASEGEOGCRS[\"GCS_GDM_2000\",DATUM[\"D_GDM_2000\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],CONVERSION[\"Cassini\",METHOD[\"Cassini\"],PARAMETER[\"False_Easting\",-34836.161],PARAMETER[\"False_Northing\",56464.049],PARAMETER[\"Central_Meridian\",101.3891079138889],PARAMETER[\"Scale_Factor\",1.0],PARAMETER[\"Latitude_Of_Origin\",3.68464905]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"EPSG\",\"3380\"]]",
  "description": "GDM 2000 Selangor",
  "authority": "EPSG",
  "version": "8.6(9.2.0)",
  "deprecated": "no",
  "areaname": "Malaysia - West Malaysia - Selangor",
  "extent": {
    "slat": 2.54,
    "nlat": 3.87,
    "llon": 100.76,
    "rlon": 101.97
  }
}