Episode 2 — React Frontend Architecture NextJS / 2.14 — State Management Using Redux

2.14.c — Actions, reducers, store, currying, middleware, and async thunks

Learning outcomes

Define actions, action creators, reducers, and the store.
Explain middleware as a composable dispatch pipeline.
Use redux-thunk (or RTK async thunks) for async workflows without polluting reducers.

Actions

An action is typically a plain object:

{ type: "todos/add", payload: { id: "1", title: "Learn Redux" } }

Action creators are functions that return actions (RTK generates these for you).

Reducers

function todosReducer(state = [], action) {
  switch (action.type) {
    case "todos/add":
      return [...state, action.payload];
    default:
      return state;
  }
}

Store

import { createStore } from "redux";

const store = createStore(todosReducer);
store.getState();
store.dispatch({ type: "todos/add", payload: { id: "1", title: "Hi" } });

Modern code should prefer configureStore from Redux Toolkit.

Currying (JavaScript) and Redux composition

Redux itself does not require currying, but you will see curried functions in middleware APIs:

const logger = (store) => (next) => (action) => {
  console.log("dispatching", action);
  const result = next(action);
  console.log("next state", store.getState());
  return result;
};

This shape composes middleware into a chain.

Middleware

Middleware sits between dispatch and reducer:

can read actions
can modify / delay / stop actions (carefully)
can dispatch additional actions
is the correct place for logging, analytics, async orchestration patterns

Async actions with `redux-thunk`

A thunk is a function returned by an action creator that receives (dispatch, getState):

const fetchTodos = () => async (dispatch, getState) => {
  dispatch({ type: "todos/load/pending" });
  try {
    const res = await fetch("/api/todos");
    const data = await res.json();
    dispatch({ type: "todos/load/fulfilled", payload: data });
  } catch (e) {
    dispatch({ type: "todos/load/rejected", error: String(e) });
  }
};

RTK provides createAsyncThunk as the modern ergonomic replacement in many apps.

Appendix — Scenario bank (basic → advanced)

Use these as design-review flashcards: what breaks, why Redux helps or hurts, what you change, what you say in an interview.

RX2-001 — Store pipeline scenario #1

Level: Beginner
Symptom: inconsistent UI state across routes after 13 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-002 — Store pipeline scenario #2

Level: Beginner+
Symptom: inconsistent UI state across routes after 26 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-003 — Store pipeline scenario #3

Level: Intermediate
Symptom: inconsistent UI state across routes after 39 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-004 — Store pipeline scenario #4

Level: Intermediate+
Symptom: inconsistent UI state across routes after 52 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-005 — Store pipeline scenario #5

Level: Advanced
Symptom: inconsistent UI state across routes after 65 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-006 — Store pipeline scenario #6

Level: Advanced+
Symptom: inconsistent UI state across routes after 78 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-007 — Store pipeline scenario #7

Level: Beginner
Symptom: inconsistent UI state across routes after 91 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-008 — Store pipeline scenario #8

Level: Beginner+
Symptom: inconsistent UI state across routes after 104 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-009 — Store pipeline scenario #9

Level: Intermediate
Symptom: inconsistent UI state across routes after 117 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-010 — Store pipeline scenario #10

Level: Intermediate+
Symptom: inconsistent UI state across routes after 130 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-011 — Store pipeline scenario #11

Level: Advanced
Symptom: inconsistent UI state across routes after 143 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-012 — Store pipeline scenario #12

Level: Advanced+
Symptom: inconsistent UI state across routes after 156 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-013 — Store pipeline scenario #13

Level: Beginner
Symptom: inconsistent UI state across routes after 169 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-014 — Store pipeline scenario #14

Level: Beginner+
Symptom: inconsistent UI state across routes after 182 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-015 — Store pipeline scenario #15

Level: Intermediate
Symptom: inconsistent UI state across routes after 195 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-016 — Store pipeline scenario #16

Level: Intermediate+
Symptom: inconsistent UI state across routes after 8 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-017 — Store pipeline scenario #17

Level: Advanced
Symptom: inconsistent UI state across routes after 21 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-018 — Store pipeline scenario #18

Level: Advanced+
Symptom: inconsistent UI state across routes after 34 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-019 — Store pipeline scenario #19

Level: Beginner
Symptom: inconsistent UI state across routes after 47 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-020 — Store pipeline scenario #20

Level: Beginner+
Symptom: inconsistent UI state across routes after 60 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-021 — Store pipeline scenario #21

Level: Intermediate
Symptom: inconsistent UI state across routes after 73 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-022 — Store pipeline scenario #22

Level: Intermediate+
Symptom: inconsistent UI state across routes after 86 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-023 — Store pipeline scenario #23

Level: Advanced
Symptom: inconsistent UI state across routes after 99 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-024 — Store pipeline scenario #24

Level: Advanced+
Symptom: inconsistent UI state across routes after 112 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-025 — Store pipeline scenario #25

Level: Beginner
Symptom: inconsistent UI state across routes after 125 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-026 — Store pipeline scenario #26

Level: Beginner+
Symptom: inconsistent UI state across routes after 138 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-027 — Store pipeline scenario #27

Level: Intermediate
Symptom: inconsistent UI state across routes after 151 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-028 — Store pipeline scenario #28

Level: Intermediate+
Symptom: inconsistent UI state across routes after 164 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-029 — Store pipeline scenario #29

Level: Advanced
Symptom: inconsistent UI state across routes after 177 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-030 — Store pipeline scenario #30

Level: Advanced+
Symptom: inconsistent UI state across routes after 190 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-031 — Store pipeline scenario #31

Level: Beginner
Symptom: inconsistent UI state across routes after 3 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-032 — Store pipeline scenario #32

Level: Beginner+
Symptom: inconsistent UI state across routes after 16 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-033 — Store pipeline scenario #33

Level: Intermediate
Symptom: inconsistent UI state across routes after 29 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-034 — Store pipeline scenario #34

Level: Intermediate+
Symptom: inconsistent UI state across routes after 42 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-035 — Store pipeline scenario #35

Level: Advanced
Symptom: inconsistent UI state across routes after 55 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-036 — Store pipeline scenario #36

Level: Advanced+
Symptom: inconsistent UI state across routes after 68 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-037 — Store pipeline scenario #37

Level: Beginner
Symptom: inconsistent UI state across routes after 81 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-038 — Store pipeline scenario #38

Level: Beginner+
Symptom: inconsistent UI state across routes after 94 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-039 — Store pipeline scenario #39

Level: Intermediate
Symptom: inconsistent UI state across routes after 107 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-040 — Store pipeline scenario #40

Level: Intermediate+
Symptom: inconsistent UI state across routes after 120 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-041 — Store pipeline scenario #41

Level: Advanced
Symptom: inconsistent UI state across routes after 133 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-042 — Store pipeline scenario #42

Level: Advanced+
Symptom: inconsistent UI state across routes after 146 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-043 — Store pipeline scenario #43

Level: Beginner
Symptom: inconsistent UI state across routes after 159 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-044 — Store pipeline scenario #44

Level: Beginner+
Symptom: inconsistent UI state across routes after 172 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-045 — Store pipeline scenario #45

Level: Intermediate
Symptom: inconsistent UI state across routes after 185 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-046 — Store pipeline scenario #46

Level: Intermediate+
Symptom: inconsistent UI state across routes after 198 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-047 — Store pipeline scenario #47

Level: Advanced
Symptom: inconsistent UI state across routes after 11 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-048 — Store pipeline scenario #48

Level: Advanced+
Symptom: inconsistent UI state across routes after 24 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-049 — Store pipeline scenario #49

Level: Beginner
Symptom: inconsistent UI state across routes after 37 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-050 — Store pipeline scenario #50

Level: Beginner+
Symptom: inconsistent UI state across routes after 50 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-051 — Store pipeline scenario #51

Level: Intermediate
Symptom: inconsistent UI state across routes after 63 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-052 — Store pipeline scenario #52

Level: Intermediate+
Symptom: inconsistent UI state across routes after 76 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-053 — Store pipeline scenario #53

Level: Advanced
Symptom: inconsistent UI state across routes after 89 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-054 — Store pipeline scenario #54

Level: Advanced+
Symptom: inconsistent UI state across routes after 102 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-055 — Store pipeline scenario #55

Level: Beginner
Symptom: inconsistent UI state across routes after 115 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-056 — Store pipeline scenario #56

Level: Beginner+
Symptom: inconsistent UI state across routes after 128 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-057 — Store pipeline scenario #57

Level: Intermediate
Symptom: inconsistent UI state across routes after 141 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-058 — Store pipeline scenario #58

Level: Intermediate+
Symptom: inconsistent UI state across routes after 154 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-059 — Store pipeline scenario #59

Level: Advanced
Symptom: inconsistent UI state across routes after 167 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-060 — Store pipeline scenario #60

Level: Advanced+
Symptom: inconsistent UI state across routes after 180 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-061 — Store pipeline scenario #61

Level: Beginner
Symptom: inconsistent UI state across routes after 193 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-062 — Store pipeline scenario #62

Level: Beginner+
Symptom: inconsistent UI state across routes after 6 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-063 — Store pipeline scenario #63

Level: Intermediate
Symptom: inconsistent UI state across routes after 19 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-064 — Store pipeline scenario #64

Level: Intermediate+
Symptom: inconsistent UI state across routes after 32 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-065 — Store pipeline scenario #65

Level: Advanced
Symptom: inconsistent UI state across routes after 45 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-066 — Store pipeline scenario #66

Level: Advanced+
Symptom: inconsistent UI state across routes after 58 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-067 — Store pipeline scenario #67

Level: Beginner
Symptom: inconsistent UI state across routes after 71 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-068 — Store pipeline scenario #68

Level: Beginner+
Symptom: inconsistent UI state across routes after 84 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-069 — Store pipeline scenario #69

Level: Intermediate
Symptom: inconsistent UI state across routes after 97 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-070 — Store pipeline scenario #70

Level: Intermediate+
Symptom: inconsistent UI state across routes after 110 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-071 — Store pipeline scenario #71

Level: Advanced
Symptom: inconsistent UI state across routes after 123 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-072 — Store pipeline scenario #72

Level: Advanced+
Symptom: inconsistent UI state across routes after 136 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-073 — Store pipeline scenario #73

Level: Beginner
Symptom: inconsistent UI state across routes after 149 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-074 — Store pipeline scenario #74

Level: Beginner+
Symptom: inconsistent UI state across routes after 162 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-075 — Store pipeline scenario #75

Level: Intermediate
Symptom: inconsistent UI state across routes after 175 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-076 — Store pipeline scenario #76

Level: Intermediate+
Symptom: inconsistent UI state across routes after 188 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-077 — Store pipeline scenario #77

Level: Advanced
Symptom: inconsistent UI state across routes after 1 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-078 — Store pipeline scenario #78

Level: Advanced+
Symptom: inconsistent UI state across routes after 14 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-079 — Store pipeline scenario #79

Level: Beginner
Symptom: inconsistent UI state across routes after 27 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-080 — Store pipeline scenario #80

Level: Beginner+
Symptom: inconsistent UI state across routes after 40 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-081 — Store pipeline scenario #81

Level: Intermediate
Symptom: inconsistent UI state across routes after 53 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-082 — Store pipeline scenario #82

Level: Intermediate+
Symptom: inconsistent UI state across routes after 66 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-083 — Store pipeline scenario #83

Level: Advanced
Symptom: inconsistent UI state across routes after 79 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-084 — Store pipeline scenario #84

Level: Advanced+
Symptom: inconsistent UI state across routes after 92 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-085 — Store pipeline scenario #85

Level: Beginner
Symptom: inconsistent UI state across routes after 105 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-086 — Store pipeline scenario #86

Level: Beginner+
Symptom: inconsistent UI state across routes after 118 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-087 — Store pipeline scenario #87

Level: Intermediate
Symptom: inconsistent UI state across routes after 131 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-088 — Store pipeline scenario #88

Level: Intermediate+
Symptom: inconsistent UI state across routes after 144 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-089 — Store pipeline scenario #89

Level: Advanced
Symptom: inconsistent UI state across routes after 157 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-090 — Store pipeline scenario #90

Level: Advanced+
Symptom: inconsistent UI state across routes after 170 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-091 — Store pipeline scenario #91

Level: Beginner
Symptom: inconsistent UI state across routes after 183 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-092 — Store pipeline scenario #92

Level: Beginner+
Symptom: inconsistent UI state across routes after 196 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-093 — Store pipeline scenario #93

Level: Intermediate
Symptom: inconsistent UI state across routes after 9 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-094 — Store pipeline scenario #94

Level: Intermediate+
Symptom: inconsistent UI state across routes after 22 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-095 — Store pipeline scenario #95

Level: Advanced
Symptom: inconsistent UI state across routes after 35 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-096 — Store pipeline scenario #96

Level: Advanced+
Symptom: inconsistent UI state across routes after 48 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-097 — Store pipeline scenario #97

Level: Beginner
Symptom: inconsistent UI state across routes after 61 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-098 — Store pipeline scenario #98

Level: Beginner+
Symptom: inconsistent UI state across routes after 74 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-099 — Store pipeline scenario #99

Level: Intermediate
Symptom: inconsistent UI state across routes after 87 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-100 — Store pipeline scenario #100

Level: Intermediate+
Symptom: inconsistent UI state across routes after 100 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-101 — Store pipeline scenario #101

Level: Advanced
Symptom: inconsistent UI state across routes after 113 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-102 — Store pipeline scenario #102

Level: Advanced+
Symptom: inconsistent UI state across routes after 126 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-103 — Store pipeline scenario #103

Level: Beginner
Symptom: inconsistent UI state across routes after 139 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-104 — Store pipeline scenario #104

Level: Beginner+
Symptom: inconsistent UI state across routes after 152 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-105 — Store pipeline scenario #105

Level: Intermediate
Symptom: inconsistent UI state across routes after 165 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-106 — Store pipeline scenario #106

Level: Intermediate+
Symptom: inconsistent UI state across routes after 178 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-107 — Store pipeline scenario #107

Level: Advanced
Symptom: inconsistent UI state across routes after 191 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-108 — Store pipeline scenario #108

Level: Advanced+
Symptom: inconsistent UI state across routes after 4 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-109 — Store pipeline scenario #109

Level: Beginner
Symptom: inconsistent UI state across routes after 17 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-110 — Store pipeline scenario #110

Level: Beginner+
Symptom: inconsistent UI state across routes after 30 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-111 — Store pipeline scenario #111

Level: Intermediate
Symptom: inconsistent UI state across routes after 43 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-112 — Store pipeline scenario #112

Level: Intermediate+
Symptom: inconsistent UI state across routes after 56 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-113 — Store pipeline scenario #113

Level: Advanced
Symptom: inconsistent UI state across routes after 69 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-114 — Store pipeline scenario #114

Level: Advanced+
Symptom: inconsistent UI state across routes after 82 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-115 — Store pipeline scenario #115

Level: Beginner
Symptom: inconsistent UI state across routes after 95 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-116 — Store pipeline scenario #116

Level: Beginner+
Symptom: inconsistent UI state across routes after 108 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-117 — Store pipeline scenario #117

Level: Intermediate
Symptom: inconsistent UI state across routes after 121 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-118 — Store pipeline scenario #118

Level: Intermediate+
Symptom: inconsistent UI state across routes after 134 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-119 — Store pipeline scenario #119

Level: Advanced
Symptom: inconsistent UI state across routes after 147 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-120 — Store pipeline scenario #120

Level: Advanced+
Symptom: inconsistent UI state across routes after 160 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-121 — Store pipeline scenario #121

Level: Beginner
Symptom: inconsistent UI state across routes after 173 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-122 — Store pipeline scenario #122

Level: Beginner+
Symptom: inconsistent UI state across routes after 186 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-123 — Store pipeline scenario #123

Level: Intermediate
Symptom: inconsistent UI state across routes after 199 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-124 — Store pipeline scenario #124

Level: Intermediate+
Symptom: inconsistent UI state across routes after 12 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-125 — Store pipeline scenario #125

Level: Advanced
Symptom: inconsistent UI state across routes after 25 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-126 — Store pipeline scenario #126

Level: Advanced+
Symptom: inconsistent UI state across routes after 38 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-127 — Store pipeline scenario #127

Level: Beginner
Symptom: inconsistent UI state across routes after 51 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-128 — Store pipeline scenario #128

Level: Beginner+
Symptom: inconsistent UI state across routes after 64 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-129 — Store pipeline scenario #129

Level: Intermediate
Symptom: inconsistent UI state across routes after 77 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-130 — Store pipeline scenario #130

Level: Intermediate+
Symptom: inconsistent UI state across routes after 90 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-131 — Store pipeline scenario #131

Level: Advanced
Symptom: inconsistent UI state across routes after 103 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-132 — Store pipeline scenario #132

Level: Advanced+
Symptom: inconsistent UI state across routes after 116 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-133 — Store pipeline scenario #133

Level: Beginner
Symptom: inconsistent UI state across routes after 129 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-134 — Store pipeline scenario #134

Level: Beginner+
Symptom: inconsistent UI state across routes after 142 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-135 — Store pipeline scenario #135

Level: Intermediate
Symptom: inconsistent UI state across routes after 155 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-136 — Store pipeline scenario #136

Level: Intermediate+
Symptom: inconsistent UI state across routes after 168 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-137 — Store pipeline scenario #137

Level: Advanced
Symptom: inconsistent UI state across routes after 181 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-138 — Store pipeline scenario #138

Level: Advanced+
Symptom: inconsistent UI state across routes after 194 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-139 — Store pipeline scenario #139

Level: Beginner
Symptom: inconsistent UI state across routes after 7 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-140 — Store pipeline scenario #140

Level: Beginner+
Symptom: inconsistent UI state across routes after 20 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-141 — Store pipeline scenario #141

Level: Intermediate
Symptom: inconsistent UI state across routes after 33 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-142 — Store pipeline scenario #142

Level: Intermediate+
Symptom: inconsistent UI state across routes after 46 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-143 — Store pipeline scenario #143

Level: Advanced
Symptom: inconsistent UI state across routes after 59 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-144 — Store pipeline scenario #144

Level: Advanced+
Symptom: inconsistent UI state across routes after 72 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-145 — Store pipeline scenario #145

Level: Beginner
Symptom: inconsistent UI state across routes after 85 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-146 — Store pipeline scenario #146

Level: Beginner+
Symptom: inconsistent UI state across routes after 98 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-147 — Store pipeline scenario #147

Level: Intermediate
Symptom: inconsistent UI state across routes after 111 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-148 — Store pipeline scenario #148

Level: Intermediate+
Symptom: inconsistent UI state across routes after 124 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-149 — Store pipeline scenario #149

Level: Advanced
Symptom: inconsistent UI state across routes after 137 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-150 — Store pipeline scenario #150

Level: Advanced+
Symptom: inconsistent UI state across routes after 150 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-151 — Store pipeline scenario #151

Level: Beginner
Symptom: inconsistent UI state across routes after 163 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-152 — Store pipeline scenario #152

Level: Beginner+
Symptom: inconsistent UI state across routes after 176 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-153 — Store pipeline scenario #153

Level: Intermediate
Symptom: inconsistent UI state across routes after 189 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Store enhancer composition mistakes breaking applyMiddleware ordering.
Primary remediation: Follow official compose patterns or use configureStore defaults.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-154 — Store pipeline scenario #154

Level: Intermediate+
Symptom: inconsistent UI state across routes after 2 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Curried action creators confuse team; inconsistent dispatch payloads.
Primary remediation: Truncate devtools payloads in dev; avoid huge blobs in actions.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-155 — Store pipeline scenario #155

Level: Advanced
Symptom: inconsistent UI state across routes after 15 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Thunk returns non-promises causing race conditions in UI awaiting completion.
Primary remediation: Modularize by domain slice; enforce ownership in code review.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-156 — Store pipeline scenario #156

Level: Advanced+
Symptom: inconsistent UI state across routes after 28 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Middleware ordered wrong so logging runs after persistence corrupts debugging.
Primary remediation: Document middleware chain order; test with synthetic dispatches.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

RX2-157 — Store pipeline scenario #157

Level: Beginner
Symptom: inconsistent UI state across routes after 41 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Reducer explosion without slice boundaries; merge conflicts in one file.
Primary remediation: Standardize async thunk return types; centralize error mapping.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Currying is a JS technique; Redux does not require it, but middleware APIs often use function composition.

RX2-158 — Store pipeline scenario #158

Level: Beginner+
Symptom: inconsistent UI state across routes after 54 rapid user actions.
Team symptom: impossible reproductions because state updates depend on hidden module globals.
Root cause class: Large serializable payloads in actions bloating devtools memory.
Primary remediation: Ban exotic patterns unless documented; prefer RTK slice action creators.
Measurement / proof: time-travel debug log of actions; reproduce with minimal route flow.
Interview one-liner: Middleware intercepts dispatch; reducers stay pure; thunks run side effects.

<< 2.14 Overview