Better error message for invalid changed hook name

src/SingleEventManager.lua

@@ -53,7 +53,17 @@ function SingleEventManager:connectEvent(key, listener)
 end
 
 function SingleEventManager:connectPropertyChange(key, listener)
-	local event = self._instance:GetPropertyChangedSignal(key)
+	local success, event = pcall(function()
+		return self._instance:GetPropertyChangedSignal(key)
+	end)
+
+	if not success then
+		error(("Cannot subscribe to changed signal: %q is not a property of %s"):format(
+			tostring(key),
+			self._instance.ClassName
+		), 0)
+	end
+
 	self:_connect(CHANGE_PREFIX .. key, event, listener)
 end
 
@@ -134,4 +144,4 @@ function SingleEventManager:resume()
 	self._suspendedEventQueue = {}
 end
 
-return SingleEventManager
+return SingleEventManager

src/SingleEventManager.spec.lua

@@ -226,5 +226,14 @@ return function()
 			instance.Name = "baz"
 			expect(eventSpy.callCount).to.equal(2)
 		end)
+
+		it("should throw an error if the property is invalid", function()
+			local instance = Instance.new("Folder")
+			local manager = SingleEventManager.new(instance)
+
+			expect(function()
+				manager:connectPropertyChange("foo", function() end)
+			end).to.throw()
+		end)
 	end)
 end