Commits on Jan 1, 2020

1. Allow await expressions in optional chaining and nullish coalescing …

   Progress toward #461
   
   Tech plan:
   https://github.com/alangpierce/sucrase/wiki/Sucrase-Optional-Chaining-and-Nullish-Coalescing-Technical-Plan
   
   We now scan for an await keyword to indicate that the nullish coalescing or
   optional chaining operation is an async one, and in that case, call a different
   helper and emit async arrow functions instead of regular ones.
   
   This needed a few extra pieces of information in the token structure:
   * We now keep track of the scope depth to distinguish awaits inside inner async
     functions.
   * We use a token field to mark that the start token is an async operation.
   * We now track the start token for each nullish coalescing operation so that we
     can reference it to determine whether to emit an async arrow function.
   
   The extra token state and the duplicated helpers are all a bit ugly, but
   hopefully there won't be much more complexity beyond this, and I may investigate
   ways to store the token state in a more concise way. And, of course, this
   transform will go away eventually when optional chaining is available in node.

   

   alangpierce committed Jan 1, 2020
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