Commits on Jul 20, 2022

1. syntax/typedjson: expose shfmt's "typed JSON" as Go APIs …

   Create a new package with docs, copy the code, and expose the API.
   The following changes were made to the API:
   
   * Name the main APIs Encode and Decode.
   * Added options structs, to give us flexibility in the future.
   * The "pretty" option is now an Indent string, like encoding/json.
   
   Note that we now require "Type" keys to come first in each object.
   This is not required right now, nor is it enforced by our decoder yet,
   but it will be necessary to implement a performant decoder.
   This is because we can only decode fields once we know the type;
   if the "Type" key comes later, we must decode twice or buffer tokens.
   
   The typed JSON encoding also changes slightly: since we want Encode and
   Decode to work on syntax.Node rather than syntax.File, the root node
   needs to include a "Type" JSON key as well.
   
   This also makes shfmt's --to-json behave nicer on empty files;
   rather than emitting `{}` lacking any information at all,
   it now emits an empty file node in tthe form of `{"Type":"File"}`.
   
   Finally, we apply some minor refactors to the code and tests.
   
   Fixes #885.

   

   mvdan committed Jul 20, 2022
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