ensure to export declaration files for TS after babel transpilation

[pyramation]

https://www.typescriptlang.org/docs/handbook/babel-with-typescript.html

"compilerOptions": {
  // Ensure that .d.ts files are created by tsc, but not .js files
  "[declaration](https://www.typescriptlang.org/tsconfig#declaration)": true,
  "[emitDeclarationOnly](https://www.typescriptlang.org/tsconfig#emitDeclarationOnly)": true,
  // Ensure that Babel can safely transpile files in the TypeScript project
  "[isolatedModules](https://www.typescriptlang.org/tsconfig#isolatedModules)": true
}

it's possible we'll need run 3 processes

1. ts-proto
2. babel transpile
3. TS declaration generation

https://v4.chriskrycho.com/2018/how-to-bundle-typescript-type-definitions.html

4. properly link the typings

https://medium.com/jspoint/typescript-type-declaration-files-4b29077c43
https://stackoverflow.com/questions/48952313/what-to-put-in-package-json-types-field-for-typescript-based-libs