
trgr.triggerAddPermissions( trigger-name as String, permissions as Sequence ) as null
Adds permissions to the set of permissions on the named trigger.
Any permissions previously associated with the trigger remain intact. This function must be run in the context of the database containing the trigger to be examined.
If the named trigger does not exist, the exception 
     TRGR-TRIGGERDNE is raised.
// Run in the context of the database containing the trigger.
const trgr = require('/MarkLogic/triggers');
trgr.triggerAddPermissions(
  'myTrigger',
  (xdmp.permission('some-role', 'read'),
   xdmp.permission('some-role', 'modify'))
);