The type property of the RTCRemoteOutboundRtpStreamStats dictionary is a string with the value "remote-outbound-rtp".
Different statistics are obtained by iterating the RTCStatsReport object returned by a call to RTCPeerConnection.getStats(). The type indicates the set of statistics available through the object in a particular iteration step. A value of "remote-outbound-rtp" indicates that the statistics available in the current step are those defined in RTCRemoteOutboundRtpStreamStats.