local types are considered exported in `.d.ts` files unlike local types in `.ts` files

Expected

local types are not removed from emitted .d.ts files based on .ts files
local types cannot be referenced in .d.ts files (neither manually nor automatically by TypeScripts type inference)

Name		Name	Last commit message	Last commit date
Latest commit History 1 Commit
.gitignore		.gitignore
README.md		README.md
declaration.d.ts		declaration.d.ts
index.d.ts		index.d.ts
index.js		index.js
index.ts		index.ts
library.d.ts		library.d.ts
library.js		library.js
library.ts		library.ts
package.json		package.json
tsconfig.json		tsconfig.json
yarn.lock		yarn.lock