Commits on Sep 9, 2019

1. assertNoDuplicates throw with more context …

   When users see errors like
   
   ```
   Duplicate plugin/preset detected.
   If you'd like to use two separate instances of a plugin,
   they need separate names, e.g.
   
     plugins: [
       ['some-plugin', {}],
       ['some-plugin', {}, 'some unique name'],
     ]
   ```
   
   It can be difficult to determine the source of the conflict, especially
   in a larger build system.
   
   This commit outputs what is known about the plugins that actually
   conflict, which can be helpful for users to determine the root cause of
   the conflict.
   
   Partially addresses babel#9778

   

   hjdivad committed Sep 9, 2019
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