https://registry.npmjs.org/duplexer/-/duplexer-0.1.2.tgz;downloadfilename=npm2/duplexer-0.1.2.tgz;sha512sum=8ed0fa606dfbd190888bff464da24a431593643d38e7ee11e214e4ff1d54ca8a9a77227dc7d0a04a2d519550d017c536b312cb4a716409a32286a9631c85a032