-- server.lua
exports.callbacks:registerServerCallback("getPlayers", function(source)
  return GetPlayers()
end)

-- client.lua
exports.callbacks:triggerServerCallback("getPlayers", function(players)
	print(#players)
end)

-- client.lua
local players = exports.callbacks:awaitServerCallback("getPlayers")
print(#players)

-- client.lua
exports.callbacks:deferServerCallback("getPlayers"):next(function(players)
	print(#players)
end)

-- client.lua
exports.callbacks:registerClientCallback("getCoords", function()
  return GetEntityCoords(PlayerPedId())
end)

-- server.lua
exports.callbacks:triggerClientCallback("getCoords", 1, function(coords)
	print(coords)
end)

-- server.lua
local coords = exports.callbacks:awaitClientCallback("getCoords", 1)
print(coords)

-- server.lua
exports.callbacks:deferClientCallback("getCoords", 1):next(function(coords)
	print(coords)
end)