WGS 1984 (Transit) - EPSG:8888

WKT

GEOGCS["WGS_1984_(Transit)", 
	DATUM["World_Geodetic_System_1984_(Transit)", 
		SPHEROID["WGS_1984", 6378137.0, 298.257223563]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["WGS_1984_(Transit)", 
	DYNAMIC[
		FRAMEEPOCH[1984.0]], 
	DATUM["World_Geodetic_System_1984_(Transit)", 
		ELLIPSOID["WGS_1984", 6378137.0, 298.257223563]], 
	PRIMEM["Greenwich", 0.0], 
	CS[ellipsoidal, 2], 
	AXIS["Latitude (lat)", north, 
		ORDER[1]], 
	AXIS["Longitude (lon)", east, 
		ORDER[2]], 
	ANGLEUNIT["Degree", 0.0174532925199433], 
	ID["EPSG", "8888"]]

Data from @esri/proj-codes

{
  "wkid": 8888,
  "latestWkid": 8888,
  "macro": "PE_GCS_WGS_1984_TRANSIT",
  "name": "WGS_1984_(Transit)",
  "wkt": "GEOGCS[\"WGS_1984_(Transit)\",DATUM[\"World_Geodetic_System_1984_(Transit)\",SPHEROID[\"WGS_1984\",6378137.0,298.257223563]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"WGS_1984_(Transit)\",DYNAMIC[FRAMEEPOCH[1984.0]],DATUM[\"World_Geodetic_System_1984_(Transit)\",ELLIPSOID[\"WGS_1984\",6378137.0,298.257223563]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433],ID[\"EPSG\",\"8888\"]]",
  "description": "WGS 1984 (Transit)",
  "authority": "EPSG",
  "version": "9.7(12.6.0)",
  "deprecated": "no",
  "areaname": "World",
  "extent": {
    "slat": -90,
    "nlat": 90,
    "llon": -180,
    "rlon": 180
  },
  "frameEpoch": 1984,
  "deformationModel": ""
}