External mode

Verification may occur in the external mode, where all methods must be either abstract or native and action statements and static media embedding are not allowed. In the external mode, no bytecode or SWF symbols are generated.

Adobe AIR

The external mode is used primarily for the Adobe AIR built-ins (top-level, flash.** and air.**). The top-level includes the parameterized Vector.<T> for instance.

The Flex library (chief.**) is not external but part of the compiler, therefore it is not verified in external mode.