[MacPorts] #52827: yarn @0.16.1

[MacPorts]

#52827: yarn @0.16.1
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 Reporter:  isomarcte   |      Owner:  macports-tickets@…
     Type:  submission  |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.3.4
 Keywords:              |       Port:  yarn
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 This is a new Port for https://yarnpkg.com/

 This is the first Portfile I have created from scratch and I have
 attempted to follow the best practices, but any feedback on the Portfile
 is greatly appreciated.

 In particular, I would appreciate an audit of the destroot phase and the
 install note. Since this is a JavaScript package there is nothing to
 build, we just unpack and copy the files into the correct locations in the
 destroot phase. There is nothing to build.

 The note informs the user that they should probably avoid using yarn as a
 global package manager, and if they do so what they might expect to have
 happen and how to handle it. I borrowed a bit of the opening wording from
 the NPM packages, since it has the same issue and the the note there was
 well written. I expanded it a bit with how one might "fix" their system if
 they do choose to install stuff locally.

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Ticket URL: <https://trac.macports.org/ticket/52827>
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