Warn (Method)

Warn( bool condition, string description )
Returns	nil
Description:	If condition is true, prints Warning passed: , followed by description, to the output, in blue text. Otherwise, prints Warning: , followed by description, to the output, in yellow text.
Member of:	TestService

Example

This code would print Warning: this action is invalid to the output, in yellow text.

game:GetService('TestService'):Warn(false, "this action is invalid")