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/middleware.js

@@ -1,66 +0,0 @@
-/*
-Garbage collection / cache management support
-
-Middleware that knows how to pull annoMatrix from the undoable state,
-and pass it along to the AnnoMatrix class for possible cache GC.
-
-Private interface.
-
-Future work item: this middleware knows internal details of both the
-Undoable metareducer and the AnnoMatrix private API.  It would be helpful
-to make the Undoable interface better factored.
-*/
-
-const annoMatrixGC = (store) => (next) => (action) => {
-  if (_itIsTimeForGC()) {
-    _doGC(store);
-  }
-  return next(action);
-};
-
-let lastGCTime = 0;
-const InterGCDelayMS = 30 * 1000; // 30 seconds
-function _itIsTimeForGC() {
-  /*
-  we don't want to run GC on every dispatch, so throttle it a bit.
-
-  Runs every InterGCDelay period
-  */
-  const now = Date.now();
-  if (now - lastGCTime > InterGCDelayMS) {
-    lastGCTime = now;
-    return true;
-  }
-  return false;
-}
-
-function _doGC(store) {
-  const state = store.getState();
-
-  // these should probably be a function imported from undoable.js, etc, as
-  // they have overly intimiate knowledge of our reducers.
-  const undoablePast = state["@@undoable/past"];
-  const undoableFuture = state["@@undoable/future"];
-  const undoableStack = undoablePast
-    .concat(undoableFuture)
-    .flatMap((snapshot) =>
-      snapshot.filter((v) => v[0] === "annoMatrix").map((v) => v[1])
-    );
-  const currentAnnoMatrix = state.annoMatrix;
-
-  /*
-  We want to identify those matrixes currently "hot", ie, linked from the current annoMatrix,
-  as our current gc algo is more aggressive with those not hot.
-  */
-  const allAnnoMatrices = new Map(
-    undoableStack.map((m) => [m, { isHot: false }])
-  );
-  let am = currentAnnoMatrix;
-  while (am) {
-    allAnnoMatrices.set(am, { isHot: true });
-    am = am.viewOf;
-  }
-  allAnnoMatrices.forEach((hints, annoMatrix) => annoMatrix._gc(hints));
-}
-
-export default annoMatrixGC;