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1import { UPDATE, INIT } from '@ngrx/store';
2import { difference, liftAction, isActionFiltered } from './utils';
3import * as DevtoolsActions from './actions';
4import { PerformAction } from './actions';
5export const INIT_ACTION = { type: INIT };
6export const RECOMPUTE = '@ngrx/store-devtools/recompute';
7export const RECOMPUTE_ACTION = { type: RECOMPUTE };
8/**
9 * Computes the next entry in the log by applying an action.
10 */
11function computeNextEntry(reducer, action, state, error, errorHandler) {
12 if (error) {
13 return {
14 state,
15 error: 'Interrupted by an error up the chain',
16 };
17 }
18 let nextState = state;
19 let nextError;
20 try {
21 nextState = reducer(state, action);
22 }
23 catch (err) {
24 nextError = err.toString();
25 errorHandler.handleError(err);
26 }
27 return {
28 state: nextState,
29 error: nextError,
30 };
31}
32/**
33 * Runs the reducer on invalidated actions to get a fresh computation log.
34 */
35function recomputeStates(computedStates, minInvalidatedStateIndex, reducer, committedState, actionsById, stagedActionIds, skippedActionIds, errorHandler, isPaused) {
36 // Optimization: exit early and return the same reference
37 // if we know nothing could have changed.
38 if (minInvalidatedStateIndex >= computedStates.length &&
39 computedStates.length === stagedActionIds.length) {
40 return computedStates;
41 }
42 const nextComputedStates = computedStates.slice(0, minInvalidatedStateIndex);
43 // If the recording is paused, recompute all states up until the pause state,
44 // else recompute all states.
45 const lastIncludedActionId = stagedActionIds.length - (isPaused ? 1 : 0);
46 for (let i = minInvalidatedStateIndex; i < lastIncludedActionId; i++) {
47 const actionId = stagedActionIds[i];
48 const action = actionsById[actionId].action;
49 const previousEntry = nextComputedStates[i - 1];
50 const previousState = previousEntry ? previousEntry.state : committedState;
51 const previousError = previousEntry ? previousEntry.error : undefined;
52 const shouldSkip = skippedActionIds.indexOf(actionId) > -1;
53 const entry = shouldSkip
54 ? previousEntry
55 : computeNextEntry(reducer, action, previousState, previousError, errorHandler);
56 nextComputedStates.push(entry);
57 }
58 // If the recording is paused, the last state will not be recomputed,
59 // because it's essentially not part of the state history.
60 if (isPaused) {
61 nextComputedStates.push(computedStates[computedStates.length - 1]);
62 }
63 return nextComputedStates;
64}
65export function liftInitialState(initialCommittedState, monitorReducer) {
66 return {
67 monitorState: monitorReducer(undefined, {}),
68 nextActionId: 1,
69 actionsById: { 0: liftAction(INIT_ACTION) },
70 stagedActionIds: [0],
71 skippedActionIds: [],
72 committedState: initialCommittedState,
73 currentStateIndex: 0,
74 computedStates: [],
75 isLocked: false,
76 isPaused: false,
77 };
78}
79/**
80 * Creates a history state reducer from an app's reducer.
81 */
82export function liftReducerWith(initialCommittedState, initialLiftedState, errorHandler, monitorReducer, options = {}) {
83 /**
84 * Manages how the history actions modify the history state.
85 */
86 return (reducer) => (liftedState, liftedAction) => {
87 let { monitorState, actionsById, nextActionId, stagedActionIds, skippedActionIds, committedState, currentStateIndex, computedStates, isLocked, isPaused, } = liftedState || initialLiftedState;
88 if (!liftedState) {
89 // Prevent mutating initialLiftedState
90 actionsById = Object.create(actionsById);
91 }
92 function commitExcessActions(n) {
93 // Auto-commits n-number of excess actions.
94 let excess = n;
95 let idsToDelete = stagedActionIds.slice(1, excess + 1);
96 for (let i = 0; i < idsToDelete.length; i++) {
97 if (computedStates[i + 1].error) {
98 // Stop if error is found. Commit actions up to error.
99 excess = i;
100 idsToDelete = stagedActionIds.slice(1, excess + 1);
101 break;
102 }
103 else {
104 delete actionsById[idsToDelete[i]];
105 }
106 }
107 skippedActionIds = skippedActionIds.filter((id) => idsToDelete.indexOf(id) === -1);
108 stagedActionIds = [0, ...stagedActionIds.slice(excess + 1)];
109 committedState = computedStates[excess].state;
110 computedStates = computedStates.slice(excess);
111 currentStateIndex =
112 currentStateIndex > excess ? currentStateIndex - excess : 0;
113 }
114 function commitChanges() {
115 // Consider the last committed state the new starting point.
116 // Squash any staged actions into a single committed state.
117 actionsById = { 0: liftAction(INIT_ACTION) };
118 nextActionId = 1;
119 stagedActionIds = [0];
120 skippedActionIds = [];
121 committedState = computedStates[currentStateIndex].state;
122 currentStateIndex = 0;
123 computedStates = [];
124 }
125 // By default, aggressively recompute every state whatever happens.
126 // This has O(n) performance, so we'll override this to a sensible
127 // value whenever we feel like we don't have to recompute the states.
128 let minInvalidatedStateIndex = 0;
129 switch (liftedAction.type) {
130 case DevtoolsActions.LOCK_CHANGES: {
131 isLocked = liftedAction.status;
132 minInvalidatedStateIndex = Infinity;
133 break;
134 }
135 case DevtoolsActions.PAUSE_RECORDING: {
136 isPaused = liftedAction.status;
137 if (isPaused) {
138 // Add a pause action to signal the devtools-user the recording is paused.
139 // The corresponding state will be overwritten on each update to always contain
140 // the latest state (see Actions.PERFORM_ACTION).
141 stagedActionIds = [...stagedActionIds, nextActionId];
142 actionsById[nextActionId] = new PerformAction({
143 type: '@ngrx/devtools/pause',
144 }, +Date.now());
145 nextActionId++;
146 minInvalidatedStateIndex = stagedActionIds.length - 1;
147 computedStates = computedStates.concat(computedStates[computedStates.length - 1]);
148 if (currentStateIndex === stagedActionIds.length - 2) {
149 currentStateIndex++;
150 }
151 minInvalidatedStateIndex = Infinity;
152 }
153 else {
154 commitChanges();
155 }
156 break;
157 }
158 case DevtoolsActions.RESET: {
159 // Get back to the state the store was created with.
160 actionsById = { 0: liftAction(INIT_ACTION) };
161 nextActionId = 1;
162 stagedActionIds = [0];
163 skippedActionIds = [];
164 committedState = initialCommittedState;
165 currentStateIndex = 0;
166 computedStates = [];
167 break;
168 }
169 case DevtoolsActions.COMMIT: {
170 commitChanges();
171 break;
172 }
173 case DevtoolsActions.ROLLBACK: {
174 // Forget about any staged actions.
175 // Start again from the last committed state.
176 actionsById = { 0: liftAction(INIT_ACTION) };
177 nextActionId = 1;
178 stagedActionIds = [0];
179 skippedActionIds = [];
180 currentStateIndex = 0;
181 computedStates = [];
182 break;
183 }
184 case DevtoolsActions.TOGGLE_ACTION: {
185 // Toggle whether an action with given ID is skipped.
186 // Being skipped means it is a no-op during the computation.
187 const { id: actionId } = liftedAction;
188 const index = skippedActionIds.indexOf(actionId);
189 if (index === -1) {
190 skippedActionIds = [actionId, ...skippedActionIds];
191 }
192 else {
193 skippedActionIds = skippedActionIds.filter((id) => id !== actionId);
194 }
195 // Optimization: we know history before this action hasn't changed
196 minInvalidatedStateIndex = stagedActionIds.indexOf(actionId);
197 break;
198 }
199 case DevtoolsActions.SET_ACTIONS_ACTIVE: {
200 // Toggle whether an action with given ID is skipped.
201 // Being skipped means it is a no-op during the computation.
202 const { start, end, active } = liftedAction;
203 const actionIds = [];
204 for (let i = start; i < end; i++)
205 actionIds.push(i);
206 if (active) {
207 skippedActionIds = difference(skippedActionIds, actionIds);
208 }
209 else {
210 skippedActionIds = [...skippedActionIds, ...actionIds];
211 }
212 // Optimization: we know history before this action hasn't changed
213 minInvalidatedStateIndex = stagedActionIds.indexOf(start);
214 break;
215 }
216 case DevtoolsActions.JUMP_TO_STATE: {
217 // Without recomputing anything, move the pointer that tell us
218 // which state is considered the current one. Useful for sliders.
219 currentStateIndex = liftedAction.index;
220 // Optimization: we know the history has not changed.
221 minInvalidatedStateIndex = Infinity;
222 break;
223 }
224 case DevtoolsActions.JUMP_TO_ACTION: {
225 // Jumps to a corresponding state to a specific action.
226 // Useful when filtering actions.
227 const index = stagedActionIds.indexOf(liftedAction.actionId);
228 if (index !== -1)
229 currentStateIndex = index;
230 minInvalidatedStateIndex = Infinity;
231 break;
232 }
233 case DevtoolsActions.SWEEP: {
234 // Forget any actions that are currently being skipped.
235 stagedActionIds = difference(stagedActionIds, skippedActionIds);
236 skippedActionIds = [];
237 currentStateIndex = Math.min(currentStateIndex, stagedActionIds.length - 1);
238 break;
239 }
240 case DevtoolsActions.PERFORM_ACTION: {
241 // Ignore action and return state as is if recording is locked
242 if (isLocked) {
243 return liftedState || initialLiftedState;
244 }
245 if (isPaused ||
246 (liftedState &&
247 isActionFiltered(liftedState.computedStates[currentStateIndex], liftedAction, options.predicate, options.actionsSafelist, options.actionsBlocklist))) {
248 // If recording is paused or if the action should be ignored, overwrite the last state
249 // (corresponds to the pause action) and keep everything else as is.
250 // This way, the app gets the new current state while the devtools
251 // do not record another action.
252 const lastState = computedStates[computedStates.length - 1];
253 computedStates = [
254 ...computedStates.slice(0, -1),
255 computeNextEntry(reducer, liftedAction.action, lastState.state, lastState.error, errorHandler),
256 ];
257 minInvalidatedStateIndex = Infinity;
258 break;
259 }
260 // Auto-commit as new actions come in.
261 if (options.maxAge && stagedActionIds.length === options.maxAge) {
262 commitExcessActions(1);
263 }
264 if (currentStateIndex === stagedActionIds.length - 1) {
265 currentStateIndex++;
266 }
267 const actionId = nextActionId++;
268 // Mutation! This is the hottest path, and we optimize on purpose.
269 // It is safe because we set a new key in a cache dictionary.
270 actionsById[actionId] = liftedAction;
271 stagedActionIds = [...stagedActionIds, actionId];
272 // Optimization: we know that only the new action needs computing.
273 minInvalidatedStateIndex = stagedActionIds.length - 1;
274 break;
275 }
276 case DevtoolsActions.IMPORT_STATE: {
277 // Completely replace everything.
278 ({
279 monitorState,
280 actionsById,
281 nextActionId,
282 stagedActionIds,
283 skippedActionIds,
284 committedState,
285 currentStateIndex,
286 computedStates,
287 isLocked,
288 isPaused,
289 } = liftedAction.nextLiftedState);
290 break;
291 }
292 case INIT: {
293 // Always recompute states on hot reload and init.
294 minInvalidatedStateIndex = 0;
295 if (options.maxAge && stagedActionIds.length > options.maxAge) {
296 // States must be recomputed before committing excess.
297 computedStates = recomputeStates(computedStates, minInvalidatedStateIndex, reducer, committedState, actionsById, stagedActionIds, skippedActionIds, errorHandler, isPaused);
298 commitExcessActions(stagedActionIds.length - options.maxAge);
299 // Avoid double computation.
300 minInvalidatedStateIndex = Infinity;
301 }
302 break;
303 }
304 case UPDATE: {
305 const stateHasErrors = computedStates.filter((state) => state.error).length > 0;
306 if (stateHasErrors) {
307 // Recompute all states
308 minInvalidatedStateIndex = 0;
309 if (options.maxAge && stagedActionIds.length > options.maxAge) {
310 // States must be recomputed before committing excess.
311 computedStates = recomputeStates(computedStates, minInvalidatedStateIndex, reducer, committedState, actionsById, stagedActionIds, skippedActionIds, errorHandler, isPaused);
312 commitExcessActions(stagedActionIds.length - options.maxAge);
313 // Avoid double computation.
314 minInvalidatedStateIndex = Infinity;
315 }
316 }
317 else {
318 // If not paused/locked, add a new action to signal devtools-user
319 // that there was a reducer update.
320 if (!isPaused && !isLocked) {
321 if (currentStateIndex === stagedActionIds.length - 1) {
322 currentStateIndex++;
323 }
324 // Add a new action to only recompute state
325 const actionId = nextActionId++;
326 actionsById[actionId] = new PerformAction(liftedAction, +Date.now());
327 stagedActionIds = [...stagedActionIds, actionId];
328 minInvalidatedStateIndex = stagedActionIds.length - 1;
329 computedStates = recomputeStates(computedStates, minInvalidatedStateIndex, reducer, committedState, actionsById, stagedActionIds, skippedActionIds, errorHandler, isPaused);
330 }
331 // Recompute state history with latest reducer and update action
332 computedStates = computedStates.map((cmp) => (Object.assign(Object.assign({}, cmp), { state: reducer(cmp.state, RECOMPUTE_ACTION) })));
333 currentStateIndex = stagedActionIds.length - 1;
334 if (options.maxAge && stagedActionIds.length > options.maxAge) {
335 commitExcessActions(stagedActionIds.length - options.maxAge);
336 }
337 // Avoid double computation.
338 minInvalidatedStateIndex = Infinity;
339 }
340 break;
341 }
342 default: {
343 // If the action is not recognized, it's a monitor action.
344 // Optimization: a monitor action can't change history.
345 minInvalidatedStateIndex = Infinity;
346 break;
347 }
348 }
349 computedStates = recomputeStates(computedStates, minInvalidatedStateIndex, reducer, committedState, actionsById, stagedActionIds, skippedActionIds, errorHandler, isPaused);
350 monitorState = monitorReducer(monitorState, liftedAction);
351 return {
352 monitorState,
353 actionsById,
354 nextActionId,
355 stagedActionIds,
356 skippedActionIds,
357 committedState,
358 currentStateIndex,
359 computedStates,
360 isLocked,
361 isPaused,
362 };
363 };
364}
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{ ErrorHandler } from '@angular/core';\nimport { Action, ActionReducer, UPDATE, INIT } from '@ngrx/store';\n\nimport { difference, liftAction, isActionFiltered } from './utils';\nimport * as DevtoolsActions from './actions';\nimport { StoreDevtoolsConfig } from './config';\nimport { PerformAction } from './actions';\n\nexport type InitAction = {\n  readonly type: typeof INIT;\n};\n\nexport type UpdateReducerAction = {\n  readonly type: typeof UPDATE;\n};\n\nexport type CoreActions = InitAction | UpdateReducerAction;\nexport type Actions = DevtoolsActions.All | CoreActions;\n\nexport const INIT_ACTION = { type: INIT };\n\nexport const RECOMPUTE = '@ngrx/store-devtools/recompute' as const;\nexport const RECOMPUTE_ACTION = { type: RECOMPUTE };\n\nexport interface ComputedState {\n  state: any;\n  error: any;\n}\n\nexport interface LiftedAction {\n  type: string;\n  action: Action;\n}\n\nexport interface LiftedActions {\n  [id: number]: LiftedAction;\n}\n\nexport interface LiftedState {\n  monitorState: any;\n  nextActionId: number;\n  actionsById: LiftedActions;\n  stagedActionIds: number[];\n  skippedActionIds: number[];\n  committedState: any;\n  currentStateIndex: number;\n  computedStates: ComputedState[];\n  isLocked: boolean;\n  isPaused: boolean;\n}\n\n/**\n * Computes the next entry in the log by applying an action.\n */\nfunction computeNextEntry(\n  reducer: ActionReducer<any, any>,\n  action: Action,\n  state: any,\n  error: any,\n  errorHandler: ErrorHandler\n) {\n  if (error) {\n    return {\n      state,\n      error: 'Interrupted by an error up the chain',\n    };\n  }\n\n  let nextState = state;\n  let nextError;\n  try {\n    nextState = reducer(state, action);\n  } catch (err) {\n    nextError = err.toString();\n    errorHandler.handleError(err);\n  }\n\n  return {\n    state: nextState,\n    error: nextError,\n  };\n}\n\n/**\n * Runs the reducer on invalidated actions to get a fresh computation log.\n */\nfunction recomputeStates(\n  computedStates: ComputedState[],\n  minInvalidatedStateIndex: number,\n  reducer: ActionReducer<any, any>,\n  committedState: any,\n  actionsById: LiftedActions,\n  stagedActionIds: number[],\n  skippedActionIds: number[],\n  errorHandler: ErrorHandler,\n  isPaused: boolean\n) {\n  // Optimization: exit early and return the same reference\n  // if we know nothing could have changed.\n  if (\n    minInvalidatedStateIndex >= computedStates.length &&\n    computedStates.length === stagedActionIds.length\n  ) {\n    return computedStates;\n  }\n\n  const nextComputedStates = computedStates.slice(0, minInvalidatedStateIndex);\n  // If the recording is paused, recompute all states up until the pause state,\n  // else recompute all states.\n  const lastIncludedActionId = stagedActionIds.length - (isPaused ? 1 : 0);\n  for (let i = minInvalidatedStateIndex; i < lastIncludedActionId; i++) {\n    const actionId = stagedActionIds[i];\n    const action = actionsById[actionId].action;\n\n    const previousEntry = nextComputedStates[i - 1];\n    const previousState = previousEntry ? previousEntry.state : committedState;\n    const previousError = previousEntry ? previousEntry.error : undefined;\n\n    const shouldSkip = skippedActionIds.indexOf(actionId) > -1;\n    const entry: ComputedState = shouldSkip\n      ? previousEntry\n      : computeNextEntry(\n          reducer,\n          action,\n          previousState,\n          previousError,\n          errorHandler\n        );\n\n    nextComputedStates.push(entry);\n  }\n  // If the recording is paused, the last state will not be recomputed,\n  // because it's essentially not part of the state history.\n  if (isPaused) {\n    nextComputedStates.push(computedStates[computedStates.length - 1]);\n  }\n\n  return nextComputedStates;\n}\n\nexport function liftInitialState(\n  initialCommittedState?: any,\n  monitorReducer?: any\n): LiftedState {\n  return {\n    monitorState: monitorReducer(undefined, {}),\n    nextActionId: 1,\n    actionsById: { 0: liftAction(INIT_ACTION) },\n    stagedActionIds: [0],\n    skippedActionIds: [],\n    committedState: initialCommittedState,\n    currentStateIndex: 0,\n    computedStates: [],\n    isLocked: false,\n    isPaused: false,\n  };\n}\n\n/**\n * Creates a history state reducer from an app's reducer.\n */\nexport function liftReducerWith(\n  initialCommittedState: any,\n  initialLiftedState: LiftedState,\n  errorHandler: ErrorHandler,\n  monitorReducer?: any,\n  options: Partial<StoreDevtoolsConfig> = {}\n) {\n  /**\n   * Manages how the history actions modify the history state.\n   */\n  return (\n    reducer: ActionReducer<any, any>\n  ): ActionReducer<LiftedState, Actions> => (liftedState, liftedAction) => {\n    let {\n      monitorState,\n      actionsById,\n      nextActionId,\n      stagedActionIds,\n      skippedActionIds,\n      committedState,\n      currentStateIndex,\n      computedStates,\n      isLocked,\n      isPaused,\n    } = liftedState || initialLiftedState;\n\n    if (!liftedState) {\n      // Prevent mutating initialLiftedState\n      actionsById = Object.create(actionsById);\n    }\n\n    function commitExcessActions(n: number) {\n      // Auto-commits n-number of excess actions.\n      let excess = n;\n      let idsToDelete = stagedActionIds.slice(1, excess + 1);\n\n      for (let i = 0; i < idsToDelete.length; i++) {\n        if (computedStates[i + 1].error) {\n          // Stop if error is found. Commit actions up to error.\n          excess = i;\n          idsToDelete = stagedActionIds.slice(1, excess + 1);\n          break;\n        } else {\n          delete actionsById[idsToDelete[i]];\n        }\n      }\n\n      skippedActionIds = skippedActionIds.filter(\n        (id) => idsToDelete.indexOf(id) === -1\n      );\n      stagedActionIds = [0, ...stagedActionIds.slice(excess + 1)];\n      committedState = computedStates[excess].state;\n      computedStates = computedStates.slice(excess);\n      currentStateIndex =\n        currentStateIndex > excess ? currentStateIndex - excess : 0;\n    }\n\n    function commitChanges() {\n      // Consider the last committed state the new starting point.\n      // Squash any staged actions into a single committed state.\n      actionsById = { 0: liftAction(INIT_ACTION) };\n      nextActionId = 1;\n      stagedActionIds = [0];\n      skippedActionIds = [];\n      committedState = computedStates[currentStateIndex].state;\n      currentStateIndex = 0;\n      computedStates = [];\n    }\n\n    // By default, aggressively recompute every state whatever happens.\n    // This has O(n) performance, so we'll override this to a sensible\n    // value whenever we feel like we don't have to recompute the states.\n    let minInvalidatedStateIndex = 0;\n\n    switch (liftedAction.type) {\n      case DevtoolsActions.LOCK_CHANGES: {\n        isLocked = liftedAction.status;\n        minInvalidatedStateIndex = Infinity;\n        break;\n      }\n      case DevtoolsActions.PAUSE_RECORDING: {\n        isPaused = liftedAction.status;\n        if (isPaused) {\n          // Add a pause action to signal the devtools-user the recording is paused.\n          // The corresponding state will be overwritten on each update to always contain\n          // the latest state (see Actions.PERFORM_ACTION).\n          stagedActionIds = [...stagedActionIds, nextActionId];\n          actionsById[nextActionId] = new PerformAction(\n            {\n              type: '@ngrx/devtools/pause',\n            },\n            +Date.now()\n          );\n          nextActionId++;\n          minInvalidatedStateIndex = stagedActionIds.length - 1;\n          computedStates = computedStates.concat(\n            computedStates[computedStates.length - 1]\n          );\n\n          if (currentStateIndex === stagedActionIds.length - 2) {\n            currentStateIndex++;\n          }\n          minInvalidatedStateIndex = Infinity;\n        } else {\n          commitChanges();\n        }\n        break;\n      }\n      case DevtoolsActions.RESET: {\n        // Get back to the state the store was created with.\n        actionsById = { 0: liftAction(INIT_ACTION) };\n        nextActionId = 1;\n        stagedActionIds = [0];\n        skippedActionIds = [];\n        committedState = initialCommittedState;\n        currentStateIndex = 0;\n        computedStates = [];\n        break;\n      }\n      case DevtoolsActions.COMMIT: {\n        commitChanges();\n        break;\n      }\n      case DevtoolsActions.ROLLBACK: {\n        // Forget about any staged actions.\n        // Start again from the last committed state.\n        actionsById = { 0: liftAction(INIT_ACTION) };\n        nextActionId = 1;\n        stagedActionIds = [0];\n        skippedActionIds = [];\n        currentStateIndex = 0;\n        computedStates = [];\n        break;\n      }\n      case DevtoolsActions.TOGGLE_ACTION: {\n        // Toggle whether an action with given ID is skipped.\n        // Being skipped means it is a no-op during the computation.\n        const { id: actionId } = liftedAction;\n        const index = skippedActionIds.indexOf(actionId);\n        if (index === -1) {\n          skippedActionIds = [actionId, ...skippedActionIds];\n        } else {\n          skippedActionIds = skippedActionIds.filter((id) => id !== actionId);\n        }\n        // Optimization: we know history before this action hasn't changed\n        minInvalidatedStateIndex = stagedActionIds.indexOf(actionId);\n        break;\n      }\n      case DevtoolsActions.SET_ACTIONS_ACTIVE: {\n        // Toggle whether an action with given ID is skipped.\n        // Being skipped means it is a no-op during the computation.\n        const { start, end, active } = liftedAction;\n        const actionIds = [];\n        for (let i = start; i < end; i++) actionIds.push(i);\n        if (active) {\n          skippedActionIds = difference(skippedActionIds, actionIds);\n        } else {\n          skippedActionIds = [...skippedActionIds, ...actionIds];\n        }\n\n        // Optimization: we know history before this action hasn't changed\n        minInvalidatedStateIndex = stagedActionIds.indexOf(start);\n        break;\n      }\n      case DevtoolsActions.JUMP_TO_STATE: {\n        // Without recomputing anything, move the pointer that tell us\n        // which state is considered the current one. Useful for sliders.\n        currentStateIndex = liftedAction.index;\n        // Optimization: we know the history has not changed.\n        minInvalidatedStateIndex = Infinity;\n        break;\n      }\n      case DevtoolsActions.JUMP_TO_ACTION: {\n        // Jumps to a corresponding state to a specific action.\n        // Useful when filtering actions.\n        const index = stagedActionIds.indexOf(liftedAction.actionId);\n        if (index !== -1) currentStateIndex = index;\n        minInvalidatedStateIndex = Infinity;\n        break;\n      }\n      case DevtoolsActions.SWEEP: {\n        // Forget any actions that are currently being skipped.\n        stagedActionIds = difference(stagedActionIds, skippedActionIds);\n        skippedActionIds = [];\n        currentStateIndex = Math.min(\n          currentStateIndex,\n          stagedActionIds.length - 1\n        );\n        break;\n      }\n      case DevtoolsActions.PERFORM_ACTION: {\n        // Ignore action and return state as is if recording is locked\n        if (isLocked) {\n          return liftedState || initialLiftedState;\n        }\n\n        if (\n          isPaused ||\n          (liftedState &&\n            isActionFiltered(\n              liftedState.computedStates[currentStateIndex],\n              liftedAction,\n              options.predicate,\n              options.actionsSafelist,\n              options.actionsBlocklist\n            ))\n        ) {\n          // If recording is paused or if the action should be ignored, overwrite the last state\n          // (corresponds to the pause action) and keep everything else as is.\n          // This way, the app gets the new current state while the devtools\n          // do not record another action.\n          const lastState = computedStates[computedStates.length - 1];\n          computedStates = [\n            ...computedStates.slice(0, -1),\n            computeNextEntry(\n              reducer,\n              liftedAction.action,\n              lastState.state,\n              lastState.error,\n              errorHandler\n            ),\n          ];\n          minInvalidatedStateIndex = Infinity;\n          break;\n        }\n\n        // Auto-commit as new actions come in.\n        if (options.maxAge && stagedActionIds.length === options.maxAge) {\n          commitExcessActions(1);\n        }\n\n        if (currentStateIndex === stagedActionIds.length - 1) {\n          currentStateIndex++;\n        }\n        const actionId = nextActionId++;\n        // Mutation! This is the hottest path, and we optimize on purpose.\n        // It is safe because we set a new key in a cache dictionary.\n        actionsById[actionId] = liftedAction;\n\n        stagedActionIds = [...stagedActionIds, actionId];\n        // Optimization: we know that only the new action needs computing.\n        minInvalidatedStateIndex = stagedActionIds.length - 1;\n        break;\n      }\n      case DevtoolsActions.IMPORT_STATE: {\n        // Completely replace everything.\n        ({\n          monitorState,\n          actionsById,\n          nextActionId,\n          stagedActionIds,\n          skippedActionIds,\n          committedState,\n          currentStateIndex,\n          computedStates,\n          isLocked,\n          isPaused,\n        } = liftedAction.nextLiftedState);\n        break;\n      }\n      case INIT: {\n        // Always recompute states on hot reload and init.\n        minInvalidatedStateIndex = 0;\n\n        if (options.maxAge && stagedActionIds.length > options.maxAge) {\n          // States must be recomputed before committing excess.\n          computedStates = recomputeStates(\n            computedStates,\n            minInvalidatedStateIndex,\n            reducer,\n            committedState,\n            actionsById,\n            stagedActionIds,\n            skippedActionIds,\n            errorHandler,\n            isPaused\n          );\n\n          commitExcessActions(stagedActionIds.length - options.maxAge);\n\n          // Avoid double computation.\n          minInvalidatedStateIndex = Infinity;\n        }\n\n        break;\n      }\n      case UPDATE: {\n        const stateHasErrors =\n          computedStates.filter((state) => state.error).length > 0;\n\n        if (stateHasErrors) {\n          // Recompute all states\n          minInvalidatedStateIndex = 0;\n\n          if (options.maxAge && stagedActionIds.length > options.maxAge) {\n            // States must be recomputed before committing excess.\n            computedStates = recomputeStates(\n              computedStates,\n              minInvalidatedStateIndex,\n              reducer,\n              committedState,\n              actionsById,\n              stagedActionIds,\n              skippedActionIds,\n              errorHandler,\n              isPaused\n            );\n\n            commitExcessActions(stagedActionIds.length - options.maxAge);\n\n            // Avoid double computation.\n            minInvalidatedStateIndex = Infinity;\n          }\n        } else {\n          // If not paused/locked, add a new action to signal devtools-user\n          // that there was a reducer update.\n          if (!isPaused && !isLocked) {\n            if (currentStateIndex === stagedActionIds.length - 1) {\n              currentStateIndex++;\n            }\n\n            // Add a new action to only recompute state\n            const actionId = nextActionId++;\n            actionsById[actionId] = new PerformAction(\n              liftedAction,\n              +Date.now()\n            );\n            stagedActionIds = [...stagedActionIds, actionId];\n\n            minInvalidatedStateIndex = stagedActionIds.length - 1;\n\n            computedStates = recomputeStates(\n              computedStates,\n              minInvalidatedStateIndex,\n              reducer,\n              committedState,\n              actionsById,\n              stagedActionIds,\n              skippedActionIds,\n              errorHandler,\n              isPaused\n            );\n          }\n\n          // Recompute state history with latest reducer and update action\n          computedStates = computedStates.map((cmp) => ({\n            ...cmp,\n            state: reducer(cmp.state, RECOMPUTE_ACTION),\n          }));\n\n          currentStateIndex = stagedActionIds.length - 1;\n\n          if (options.maxAge && stagedActionIds.length > options.maxAge) {\n            commitExcessActions(stagedActionIds.length - options.maxAge);\n          }\n\n          // Avoid double computation.\n          minInvalidatedStateIndex = Infinity;\n        }\n\n        break;\n      }\n      default: {\n        // If the action is not recognized, it's a monitor action.\n        // Optimization: a monitor action can't change history.\n        minInvalidatedStateIndex = Infinity;\n        break;\n      }\n    }\n\n    computedStates = recomputeStates(\n      computedStates,\n      minInvalidatedStateIndex,\n      reducer,\n      committedState,\n      actionsById,\n      stagedActionIds,\n      skippedActionIds,\n      errorHandler,\n      isPaused\n    );\n    monitorState = monitorReducer(monitorState, liftedAction);\n\n    return {\n      monitorState,\n      actionsById,\n      nextActionId,\n      stagedActionIds,\n      skippedActionIds,\n      committedState,\n      currentStateIndex,\n      computedStates,\n      isLocked,\n      isPaused,\n    };\n  };\n}\n"]}
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