The type property of the RTCOutboundRtpStreamStats dictionary is a string with the value "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 "outbound-rtp" indicates that the statistics available in the current step are those defined in RTCOutboundRtpStreamStats.