Commits on Apr 7, 2019

1. Include actual types for restrict-plus-operands. …

   It can be difficult for users to find out why exactly they received the
   "restrict-plus-operands" lint error. In particular, users often end up
   with `any` types leaking into their code (e.g. in tests), and are then
   puzzled why this triggers.
   
   To fix, this change includes a textual representation of the type in the
   error message, e.g.:
   
       [Operands of '+' operation must either be both strings or both numbers, but found 5 + undefined[]]
   
   The type representation isn't always super pretty (e.g. the
   `undefined[]` bit above), but should still be helpful, and also matches
   TS compiler's representation of these.

   

   mprobst committed Apr 7, 2019
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2. Special case emitting undefined[] for empty arrays.

   

   mprobst committed Apr 7, 2019
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3. Trivial change to kickstart CircleCI

   Josh Goldberg committed Apr 7, 2019
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4. Revert "Trivial change to kickstart CircleCI"

   Josh Goldberg committed Apr 7, 2019
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