Changes

Most grips are <b>pauseLifetimepause-lifetime</b> grips: they last only while the JavaScript thread is paused, and become invalid as soon as the debugger allows the thread to resume execution. (The actors in pause-lifetime grips are children of an actor that is closed when the thread resumes, or is detached from.) This arrangement allows the protocol to use grips freely in responses without requiring the client to remember and close them all.

However, in some cases the client may wish to retain a reference to an object while the debuggee runs. For example, a panel displaying objects selected by the user must update its view of the objects each time the debuggee pauses. To carry this out, the client can promote a pause-lifetime grip to a <b>threadLifetimethread-lifetime</b> grip, which lasts until the thread is detached from or exits. Actors in thread-lifetime grips are children of the thread actor. When the client no longer needs a thread-lifetime grip, it can explicitly release it.

This represents bindings introduced by a <tt>let</tt> block, <tt>forInfor-in</tt> statement, <tt>catch</tt> block, or the like. The properties are as described above.