chore(typescript): remove typings

[alexkrolick]

See #3500

If accepted, someone should probably take the diff over to DefinitelyTyped and get that ready

[alexkrolick]

Side note: The docs build is complaining about prettier 🤔

[nickserv]

It would be best to wait to merge until the types are published in DefinitelyTyped and then increment the major version number.

[nickserv]

Side note: The docs build is complaining about prettier 🤔

The build is failing because Prettier is looking for index.d.ts, which doesn't exist.

Try this:

-    "format": "prettier --write \"{src,test}/**/*.{js,ts}\" index.d.ts \"**/*.md\"",
-    "format:check": "prettier --list-different \"{src,test}/**/*.{js,ts}\" index.d.ts \"**/*.md\"",
+    "format": "prettier --write \"{src,test}/**/*.js\" \"**/*.md\"",
+    "format:check": "prettier --list-different \"{src,test}/**/*.js\" \"**/*.md\"",