toObject() inferred type too long when compiled with declaration: true

[Hilzu]

I'm working with pg_query.proto from libpg_query and encountered this issue generating code with protoc-gen-ts.

When compiling the generated module with "declaration": true set in tsconfig.json the tsc build fails with the following error:

src/protoc-gen-ts/pg_query.ts:76418:9 - error TS7056: The inferred type of this node exceeds the maximum length the compiler will serialize. An explicit type annotation is needed.

76418         toObject() {
              ~~~~~~~~


Found 1 error in src/protoc-gen-ts/pg_query.ts:76418

Something about enabling generating declaration files seems to cause the toObject inferred type to become too long for tsc. There might be other option that cause this but I could reliably reproduce the issue with the declaration option.

Issue is reproduced here: https://github.com/Hilzu/ts-proto-with-pg-query/tree/protoc-gen-ts

[Yo-mah-Ya]

Same here!
I just fixed this problem to add return type explicitly using type aliases to prevent from making file size bigger.

#232