) {\r\n if (process.env.NODE_ENV !== 'production') {\r\n if (defaultCaseReducer) {\r\n throw new Error('`builder.addDefaultCase` can only be called once')\r\n }\r\n }\r\n defaultCaseReducer = reducer\r\n return builder\r\n },\r\n }\r\n builderCallback(builder)\r\n return [actionsMap, actionMatchers, defaultCaseReducer]\r\n}\r\n","import type { AnyAction, Reducer } from 'redux'\r\nimport { createNextState } from '.'\r\nimport type {\r\n ActionCreatorWithoutPayload,\r\n PayloadAction,\r\n PayloadActionCreator,\r\n PrepareAction,\r\n _ActionCreatorWithPreparedPayload,\r\n} from './createAction'\r\nimport { createAction } from './createAction'\r\nimport type {\r\n CaseReducer,\r\n CaseReducers,\r\n ReducerWithInitialState,\r\n} from './createReducer'\r\nimport { createReducer, NotFunction } from './createReducer'\r\nimport type { ActionReducerMapBuilder } from './mapBuilders'\r\nimport { executeReducerBuilderCallback } from './mapBuilders'\r\nimport type { NoInfer } from './tsHelpers'\r\nimport { freezeDraftable } from './utils'\r\n\r\nlet hasWarnedAboutObjectNotation = false\r\n\r\n/**\r\n * An action creator attached to a slice.\r\n *\r\n * @deprecated please use PayloadActionCreator directly\r\n *\r\n * @public\r\n */\r\nexport type SliceActionCreator = PayloadActionCreator
\r\n\r\n/**\r\n * The return value of `createSlice`\r\n *\r\n * @public\r\n */\r\nexport interface Slice<\r\n State = any,\r\n CaseReducers extends SliceCaseReducers = SliceCaseReducers,\r\n Name extends string = string\r\n> {\r\n /**\r\n * The slice name.\r\n */\r\n name: Name\r\n\r\n /**\r\n * The slice's reducer.\r\n */\r\n reducer: Reducer\r\n\r\n /**\r\n * Action creators for the types of actions that are handled by the slice\r\n * reducer.\r\n */\r\n actions: CaseReducerActions\r\n\r\n /**\r\n * The individual case reducer functions that were passed in the `reducers` parameter.\r\n * This enables reuse and testing if they were defined inline when calling `createSlice`.\r\n */\r\n caseReducers: SliceDefinedCaseReducers\r\n\r\n /**\r\n * Provides access to the initial state value given to the slice.\r\n * If a lazy state initializer was provided, it will be called and a fresh value returned.\r\n */\r\n getInitialState: () => State\r\n}\r\n\r\n/**\r\n * Options for `createSlice()`.\r\n *\r\n * @public\r\n */\r\nexport interface CreateSliceOptions<\r\n State = any,\r\n CR extends SliceCaseReducers = SliceCaseReducers,\r\n Name extends string = string\r\n> {\r\n /**\r\n * The slice's name. Used to namespace the generated action types.\r\n */\r\n name: Name\r\n\r\n /**\r\n * The initial state that should be used when the reducer is called the first time. This may also be a \"lazy initializer\" function, which should return an initial state value when called. This will be used whenever the reducer is called with `undefined` as its state value, and is primarily useful for cases like reading initial state from `localStorage`.\r\n */\r\n initialState: State | (() => State)\r\n\r\n /**\r\n * A mapping from action types to action-type-specific *case reducer*\r\n * functions. For every action type, a matching action creator will be\r\n * generated using `createAction()`.\r\n */\r\n reducers: ValidateSliceCaseReducers\r\n\r\n /**\r\n * A callback that receives a *builder* object to define\r\n * case reducers via calls to `builder.addCase(actionCreatorOrType, reducer)`.\r\n * \r\n * Alternatively, a mapping from action types to action-type-specific *case reducer*\r\n * functions. These reducers should have existing action types used\r\n * as the keys, and action creators will _not_ be generated.\r\n * \r\n * @example\r\n```ts\r\nimport { createAction, createSlice, Action, AnyAction } from '@reduxjs/toolkit'\r\nconst incrementBy = createAction('incrementBy')\r\nconst decrement = createAction('decrement')\r\n\r\ninterface RejectedAction extends Action {\r\n error: Error\r\n}\r\n\r\nfunction isRejectedAction(action: AnyAction): action is RejectedAction {\r\n return action.type.endsWith('rejected')\r\n}\r\n\r\ncreateSlice({\r\n name: 'counter',\r\n initialState: 0,\r\n reducers: {},\r\n extraReducers: builder => {\r\n builder\r\n .addCase(incrementBy, (state, action) => {\r\n // action is inferred correctly here if using TS\r\n })\r\n // You can chain calls, or have separate `builder.addCase()` lines each time\r\n .addCase(decrement, (state, action) => {})\r\n // You can match a range of action types\r\n .addMatcher(\r\n isRejectedAction,\r\n // `action` will be inferred as a RejectedAction due to isRejectedAction being defined as a type guard\r\n (state, action) => {}\r\n )\r\n // and provide a default case if no other handlers matched\r\n .addDefaultCase((state, action) => {})\r\n }\r\n})\r\n```\r\n */\r\n extraReducers?:\r\n | CaseReducers, any>\r\n | ((builder: ActionReducerMapBuilder>) => void)\r\n}\r\n\r\n/**\r\n * A CaseReducer with a `prepare` method.\r\n *\r\n * @public\r\n */\r\nexport type CaseReducerWithPrepare = {\r\n reducer: CaseReducer\r\n prepare: PrepareAction\r\n}\r\n\r\n/**\r\n * The type describing a slice's `reducers` option.\r\n *\r\n * @public\r\n */\r\nexport type SliceCaseReducers = {\r\n [K: string]:\r\n | CaseReducer>\r\n | CaseReducerWithPrepare>\r\n}\r\n\r\ntype SliceActionType<\r\n SliceName extends string,\r\n ActionName extends keyof any\r\n> = ActionName extends string | number ? `${SliceName}/${ActionName}` : string\r\n\r\n/**\r\n * Derives the slice's `actions` property from the `reducers` options\r\n *\r\n * @public\r\n */\r\nexport type CaseReducerActions<\r\n CaseReducers extends SliceCaseReducers,\r\n SliceName extends string\r\n> = {\r\n [Type in keyof CaseReducers]: CaseReducers[Type] extends { prepare: any }\r\n ? ActionCreatorForCaseReducerWithPrepare<\r\n CaseReducers[Type],\r\n SliceActionType\r\n >\r\n : ActionCreatorForCaseReducer<\r\n CaseReducers[Type],\r\n SliceActionType\r\n >\r\n}\r\n\r\n/**\r\n * Get a `PayloadActionCreator` type for a passed `CaseReducerWithPrepare`\r\n *\r\n * @internal\r\n */\r\ntype ActionCreatorForCaseReducerWithPrepare<\r\n CR extends { prepare: any },\r\n Type extends string\r\n> = _ActionCreatorWithPreparedPayload\r\n\r\n/**\r\n * Get a `PayloadActionCreator` type for a passed `CaseReducer`\r\n *\r\n * @internal\r\n */\r\ntype ActionCreatorForCaseReducer = CR extends (\r\n state: any,\r\n action: infer Action\r\n) => any\r\n ? Action extends { payload: infer P }\r\n ? PayloadActionCreator\r\n : ActionCreatorWithoutPayload\r\n : ActionCreatorWithoutPayload\r\n\r\n/**\r\n * Extracts the CaseReducers out of a `reducers` object, even if they are\r\n * tested into a `CaseReducerWithPrepare`.\r\n *\r\n * @internal\r\n */\r\ntype SliceDefinedCaseReducers> = {\r\n [Type in keyof CaseReducers]: CaseReducers[Type] extends {\r\n reducer: infer Reducer\r\n }\r\n ? Reducer\r\n : CaseReducers[Type]\r\n}\r\n\r\n/**\r\n * Used on a SliceCaseReducers object.\r\n * Ensures that if a CaseReducer is a `CaseReducerWithPrepare`, that\r\n * the `reducer` and the `prepare` function use the same type of `payload`.\r\n *\r\n * Might do additional such checks in the future.\r\n *\r\n * This type is only ever useful if you want to write your own wrapper around\r\n * `createSlice`. Please don't use it otherwise!\r\n *\r\n * @public\r\n */\r\nexport type ValidateSliceCaseReducers<\r\n S,\r\n ACR extends SliceCaseReducers\r\n> = ACR &\r\n {\r\n [T in keyof ACR]: ACR[T] extends {\r\n reducer(s: S, action?: infer A): any\r\n }\r\n ? {\r\n prepare(...a: never[]): Omit\r\n }\r\n : {}\r\n }\r\n\r\nfunction getType(slice: string, actionKey: string): string {\r\n return `${slice}/${actionKey}`\r\n}\r\n\r\n/**\r\n * A function that accepts an initial state, an object full of reducer\r\n * functions, and a \"slice name\", and automatically generates\r\n * action creators and action types that correspond to the\r\n * reducers and state.\r\n *\r\n * The `reducer` argument is passed to `createReducer()`.\r\n *\r\n * @public\r\n */\r\nexport function createSlice<\r\n State,\r\n CaseReducers extends SliceCaseReducers,\r\n Name extends string = string\r\n>(\r\n options: CreateSliceOptions
![\"login\"](\"/static/illustrations/illustration_login_2.png\")
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