Commits on May 11, 2020

1. Add support for TS type-only imports and exports …

   Fixes #520
   
   The PR #523 already added parsing support for type-only import and export
   syntax, and there was already support for removing `import type` from Flow, so
   the only new logic was to fully support `export type`. The implementation here
   is a little ugly; Flow's version sets the tokens as type tokens, whereas the TS
   version sets the types as regular tokens and removes them at transform type.
   This seems to be necessary to follow the behavior that `export type` statements
   do not result in the imported value being elided.
   
   Ideally, Sucrase would support the `importsNotUsedAsValues` TS preference in
   some way, but for now, it keeps the old behavior of eliding type-only imports.
   The setting `importsNotUsedAsValues=error` should make the distinction
   irrelevant anyway, so it seems low priority to support.

   

   alangpierce committed May 11, 2020
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