[Glitch] Add stricter ESLint rules for Typescript files

Port 5eeb40bdbe to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/store/middlewares/errors.ts

@@ -1,17 +1,19 @@
-import { Middleware } from 'redux';
+import type { AnyAction, Middleware } from 'redux';
+
 import { showAlertForError } from 'flavours/glitch/actions/alerts';
-import { RootState } from '..';
+
+import type { RootState } from '..';
 
 const defaultFailSuffix = 'FAIL';
 
 export const errorsMiddleware: Middleware<Record<string, never>, RootState> =
   ({ dispatch }) =>
   (next) =>
-  (action) => {
+  (action: AnyAction & { skipAlert?: boolean; skipNotFound?: boolean }) => {
     if (action.type && !action.skipAlert) {
       const isFail = new RegExp(`${defaultFailSuffix}$`, 'g');
 
-      if (action.type.match(isFail)) {
+      if (typeof action.type === 'string' && action.type.match(isFail)) {
         dispatch(showAlertForError(action.error, action.skipNotFound));
       }
     }