added typescript types

[danielgamage]

rollup now emits typescript declaration files (.d.ts) for each of our entry files in the distribution folder for static type checking. also allows for some easier inline documentation. just need to publish and make sure the declaration files get detected properly in the package.

dist/
  web-component.js
  web-component.d.ts
  react-component.js
  react-component.d.ts
  ...

[danielgamage]

support for the package.json exports field, which we use, was removed until at least 4.6 (looks like 4.7 now). trying to find a workaround to ship this prior to that (probably February 22nd)

[danielgamage]

i'm not actually having the issues in typescript that i thought i would anymore, so i'm going to merge, release, then double-check our other demos

edit: totally kidding but i think i have a workaround in moving things out of dist/ and importing files directly