add skip dispatch function

app/javascript/mastodon/store/typed_functions.ts

@@ -60,7 +60,7 @@ type AppThunk<Arg = void, Returned = void> = (
 
 type AppThunkCreator<Arg = void, Returned = void, ExtraArg = unknown> = (
   arg: Arg,
-  api: AppThunkApi,
+  api: AppThunkApi & { skipDispatch: () => void },
   extra?: ExtraArg,
 ) => Returned;
 
@@ -102,11 +102,20 @@ export function createAppThunk<Arg = void, Returned = void, ExtraArg = unknown>(
   const extra = isDispatcher ? maybeExtra : (maybeCreatorOrExtra as ExtraArg);
   let action: null | AppThunkActionCreator<Arg, Returned> = null;
 
+  let skipDispatch = false;
+  const toggleSkipDispatch = () => {
+    skipDispatch = !skipDispatch;
+  };
+
   // Creates a thunk that dispatches the action with the result of the creator.
   const actionCreator: AppThunk<Arg, Returned> = (arg) => {
     return (dispatch, getState) => {
-      const result = creator(arg, { dispatch, getState }, extra);
-      if (action) {
+      const result = creator(
+        arg,
+        { dispatch, getState, skipDispatch: toggleSkipDispatch },
+        extra,
+      );
+      if (action && !skipDispatch) {
         // Dispatches the action with the result.
         const actionObj = action(result, arg);
         dispatch(actionObj);