1. DomName('ConsoleBase.assert')
  2. DocsEditable()
  3. Experimental()
void assertCondition(bool condition, Object arg)

Source 

@DomName('ConsoleBase.assert')
@DocsEditable()
@Experimental() // untriaged
void assertCondition(bool condition, Object arg) => _blink.BlinkConsoleBase.instance.assert_Callback_2_(this, condition, arg);