Commits on Jan 7, 2020

1. Store richer adapter types, don't use instructions for TypeScript …

   This commit updates how TypeScript signature are generated from adapters
   in wasm-bindgen. A richer set of `AdapterType` types are now stored
   which record information about optional types and such. These direct
   `AdapterType` values are then used to calculate the TypeScript
   signature, rather than following the instructions in an adapter function
   (which only works anyway for wasm-bindgen generated adapters).
   
   This should be more robust since it reads the actual true signature of
   the adapter to generate the TypeScript signature, rather than attempting
   to ad-hoc-ly infer it from the various instructions, which was already
   broken.
   
   A number of refactorings were involved here, but the main pieces are:
   
   * The `AdapterType` type is a bit more rich now to describe more
     Rust-like types.
   * The `TypescriptArg` structure is now gone and instead return values
     are directly inferred from type signatures of adapters.
   * The `typescript_{required,optional}` methods are no longer needed.
   * The return of `JsBuilder::process` was enhanced to return more values,
     rather than storing some return values on the structure itself.
   
   Closes rustwasm#1926

   

   alexcrichton committed Jan 7, 2020
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