nl_tokens: Wraps addEventListener to capture UI breadcrumbs
pl_tokens: function _breadcrumbEventHandler ( evtName ) { var self = this ; return function ( evt ) { // reset keypress timeout; e.g. triggering a 'click' after // a 'keypress' will reset the keypress debounce so that a new // set of keypresses can be recorded self . _keypressTimeout = null ; // It's possible this handler might trigger multiple times for the same // event (e.g. event propagation through node ancestors). Ignore if we've // already captured the event. if ( self . _lastCapturedEvent === evt ) return ; self . _lastCapturedEvent = evt ; // try/catch both: // - accessing evt.target (see getsentry/raven-js#838, #768) // - `htmlTreeAsString` because it's complex, and just accessing the DOM incorrectly //   can throw an exception in some circumstances. var target ; try { target = htmlTreeAsString$1 ( evt . target ) ; } catch ( e ) { target = '<unknown>' ; } self . captureBreadcrumb ( { category : 'ui.' + evtName , // e.g. ui.click, ui.input <mask> : target } ) ; } ; }