class ActionDispatch::Request::Session

def has_key?(key)

Experimental RBS support (using type sampling data from the type_fusion project). 

def has_key?: (String key) -> true

This signature was generated using 1 sample from 1 application.

Returns true if the session has the given key or false. 
def has_key?(key)
  load_for_read!
  @delegate.key?(key.to_s)
end