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/__tests__/reducers/cascade.test.ts

@@ -20,7 +20,12 @@ describe("cascade", () => {
     const reducer = cascadeReducers([
       [
         "foo",
-        (currentState, action, nextSharedState, prevSharedState) => {
+        (
+          currentState: any,
+          action: any,
+          nextSharedState: any,
+          prevSharedState: any
+        ) => {
           expect(currentState).toBeUndefined();
           expect(action).toEqual(topLevelAction);
           expect(nextSharedState).toStrictEqual({});
@@ -30,7 +35,12 @@ describe("cascade", () => {
       ],
       [
         "bar",
-        (currentState, action, nextSharedState, prevSharedState) => {
+        (
+          currentState: any,
+          action: any,
+          nextSharedState: any,
+          prevSharedState: any
+        ) => {
           expect(currentState).toBeUndefined();
           expect(action).toEqual(topLevelAction);
           expect(nextSharedState).toStrictEqual({ foo: 0 });

client/__tests__/reducers/genesets.test.ts

@@ -501,6 +501,7 @@ describe("geneset: set tid", () => {
   test("not a number error", () => {
     expect(() => {
       genesetsReducer(
+        // @ts-expect-error ts-migrate(2322) FIXME: Type 'number' is not assignable to type 'undefined... Remove this comment to see the full error message
         { lastTid: 1 },
         {
           type: "geneset: set tid",
@@ -513,6 +514,7 @@ describe("geneset: set tid", () => {
   test("decrement error", () => {
     expect(() => {
       genesetsReducer(
+        // @ts-expect-error ts-migrate(2322) FIXME: Type 'number' is not assignable to type 'undefined... Remove this comment to see the full error message
         { lastTid: 1 },
         {
           type: "geneset: set tid",

client/__tests__/reducers/undoable.test.ts

@@ -2,6 +2,7 @@ import undoable from "../../src/reducers/undoable";
 
 describe("create", () => {
   test("no keys", () => {
+    // @ts-expect-error ts-migrate(2554) FIXME: Expected 2-3 arguments, but got 1.
     expect(() => undoable(() => {})).toThrow();
     expect(() => undoable(() => {}, null)).toThrow();
     expect(() => undoable(() => {}, [])).toThrow();
@@ -23,7 +24,7 @@ describe("create", () => {
 describe("undo", () => {
   test("expected state modifications", () => {
     const initialState = { a: 0, b: 1000 };
-    const reducer = (state) => {
+    const reducer = (state: any) => {
       return { a: state.a + 1, b: state.b + 1 };
     };
     const undoableReducer = undoable(reducer, ["a"]);
@@ -43,10 +44,10 @@ describe("undo", () => {
 
 describe("redo", () => {
   const initialState = { a: 0, b: 1000 };
-  const reducer = (state) => {
+  const reducer = (state: any) => {
     return { a: state.a + 1, b: state.b + 1 };
   };
-  let UR;
+  let UR: any;
 
   beforeEach(() => {
     UR = undoable(reducer, ["a"]);