Looks like when upgrading we broke the build stack for node 6 testing due to how uglifyjs handles unrecognized options. This is cause a build failure for the node 6 stacks. This PR should resolve the failed builds.
Coverage remained the same at 100.0% when pulling fce824361414165dca766a926a72556777f9d9a8 on bug/uglifyjs-fix-node-6 into f850141682a9993b85f6194d63a483f6baeed83f on master.
Picard is Disappoint.
Looks like when upgrading we broke the build stack for node 6 testing due to how uglifyjs handles unrecognized options. This is cause a build failure for the node 6 stacks. This PR should resolve the failed builds.