Historically, Puppet Open Source and Enterprise have had different paths for different resources. Beaker supports these configurations through the use of its type parameter. The Beaker CLI exposes this parameter with the --type option.
The two older types are represented by the foss and pe values.
Note that if you don't provide any type, the default is pe.
With the introduction of the All-In-One (AIO) Agent in Puppet 4, the paths have been unified across both versions (Open Source & Enterprise). In order to support this, Beaker has added the aio type.
Passing this argument will setup the machines to use the new AIO pathing. This should be all you need to be correctly setup to use the AIO Agent in Puppet 4 and beyond!