Simplified: Recorder is assigned a new instance of t with specified parameters then recorder starts recording and abortHandler is assigned recorder.stopRecording
Simplified: r.s is less than 0 or r.e is less than 0 or r.e is less than r.s then execute (0,l.R)(61,{start:r.s,end:r.e}) otherwise execute (0,s.p)("bstApi",[r],v...