TS migration. #2288. (#2328)

* Added TS. Updated build and linting config. Added types.

* [ts-migrate][.] Rename files from JS/JSX to TS/TSX

Co-authored-by: ts-migrate <>

* [ts-migrate][.] Run TS Migrate

Co-authored-by: ts-migrate <>

* Corrected files mangled by ts-migrate.

* Updated lint config, minor linting.

* Re-enabled Husky.

* Updated tests and config.

* Reverted webpack devtool config.

* Removed obsolete snapshots.

* Added annotations snap.

* Updated tsconfig includes wrt linting.

* Removed ts-migrate.

Co-authored-by: Timmy Huang <tihuan@users.noreply.github.com>

client/src/annoMatrix/fetchHelpers.js

@@ -1,27 +0,0 @@
-export { doBinaryRequest, doFetch } from "../util/actionHelpers";
-
-/* double URI encode - needed for query-param filters */
-export function _dubEncURIComp(s) {
-  return encodeURIComponent(encodeURIComponent(s));
-}
-
-/* currently unused, consider deleting */
-export function _fetchResult(promise) {
-  let _status = "pending";
-  const res = promise.then(
-    (r) => {
-      _status = "success";
-      return r;
-    },
-    (e) => {
-      _status = "error";
-      throw e;
-    }
-  );
-
-  res.status = () => {
-    return _status;
-  };
-
-  return res;
-}