TypeScript: Backport v15 .d.ts fixes to v14#2140

Merged

IvanGoncharov merged 2 commits intographql:masterfrom

apollographql:upstream-master

Aug 28, 2019

Commits on Aug 27, 2019

Add `index.d.ts` as "types" field of package.json.
Jackson Kearl
committed
Replace `index` imports with specific paths
Jackson Kearl
committed