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112 lines
4.9 KiB
TypeScript
112 lines
4.9 KiB
TypeScript
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import type { Action, AnyAction } from 'redux';
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import type { CaseReducer, CaseReducers, ActionMatcher, ActionMatcherDescriptionCollection } from './createReducer';
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export interface TypedActionCreator<Type extends string> {
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(...args: any[]): Action<Type>;
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type: Type;
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}
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/**
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* A builder for an action <-> reducer map.
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*
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* @public
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*/
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export interface ActionReducerMapBuilder<State> {
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/**
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* Adds a case reducer to handle a single exact action type.
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* @remarks
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* All calls to `builder.addCase` must come before any calls to `builder.addMatcher` or `builder.addDefaultCase`.
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* @param actionCreator - Either a plain action type string, or an action creator generated by [`createAction`](./createAction) that can be used to determine the action type.
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* @param reducer - The actual case reducer function.
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*/
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addCase<ActionCreator extends TypedActionCreator<string>>(actionCreator: ActionCreator, reducer: CaseReducer<State, ReturnType<ActionCreator>>): ActionReducerMapBuilder<State>;
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/**
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* Adds a case reducer to handle a single exact action type.
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* @remarks
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* All calls to `builder.addCase` must come before any calls to `builder.addMatcher` or `builder.addDefaultCase`.
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* @param actionCreator - Either a plain action type string, or an action creator generated by [`createAction`](./createAction) that can be used to determine the action type.
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* @param reducer - The actual case reducer function.
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*/
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addCase<Type extends string, A extends Action<Type>>(type: Type, reducer: CaseReducer<State, A>): ActionReducerMapBuilder<State>;
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/**
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* Allows you to match your incoming actions against your own filter function instead of only the `action.type` property.
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* @remarks
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* If multiple matcher reducers match, all of them will be executed in the order
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* they were defined in - even if a case reducer already matched.
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* All calls to `builder.addMatcher` must come after any calls to `builder.addCase` and before any calls to `builder.addDefaultCase`.
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* @param matcher - A matcher function. In TypeScript, this should be a [type predicate](https://www.typescriptlang.org/docs/handbook/advanced-types.html#using-type-predicates)
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* function
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* @param reducer - The actual case reducer function.
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*
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* @example
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```ts
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import {
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createAction,
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createReducer,
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AsyncThunk,
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AnyAction,
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} from "@reduxjs/toolkit";
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type GenericAsyncThunk = AsyncThunk<unknown, unknown, any>;
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type PendingAction = ReturnType<GenericAsyncThunk["pending"]>;
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type RejectedAction = ReturnType<GenericAsyncThunk["rejected"]>;
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type FulfilledAction = ReturnType<GenericAsyncThunk["fulfilled"]>;
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const initialState: Record<string, string> = {};
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const resetAction = createAction("reset-tracked-loading-state");
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function isPendingAction(action: AnyAction): action is PendingAction {
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return action.type.endsWith("/pending");
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}
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const reducer = createReducer(initialState, (builder) => {
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builder
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.addCase(resetAction, () => initialState)
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// matcher can be defined outside as a type predicate function
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.addMatcher(isPendingAction, (state, action) => {
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state[action.meta.requestId] = "pending";
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})
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.addMatcher(
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// matcher can be defined inline as a type predicate function
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(action): action is RejectedAction => action.type.endsWith("/rejected"),
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(state, action) => {
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state[action.meta.requestId] = "rejected";
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}
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)
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// matcher can just return boolean and the matcher can receive a generic argument
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.addMatcher<FulfilledAction>(
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(action) => action.type.endsWith("/fulfilled"),
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(state, action) => {
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state[action.meta.requestId] = "fulfilled";
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}
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);
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});
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```
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*/
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addMatcher<A extends AnyAction>(matcher: ActionMatcher<A> | ((action: AnyAction) => boolean), reducer: CaseReducer<State, A>): Omit<ActionReducerMapBuilder<State>, 'addCase'>;
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/**
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* Adds a "default case" reducer that is executed if no case reducer and no matcher
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* reducer was executed for this action.
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* @param reducer - The fallback "default case" reducer function.
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*
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* @example
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```ts
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import { createReducer } from '@reduxjs/toolkit'
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const initialState = { otherActions: 0 }
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const reducer = createReducer(initialState, builder => {
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builder
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// .addCase(...)
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// .addMatcher(...)
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.addDefaultCase((state, action) => {
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state.otherActions++
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})
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})
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```
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*/
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addDefaultCase(reducer: CaseReducer<State, AnyAction>): {};
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}
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export declare function executeReducerBuilderCallback<S>(builderCallback: (builder: ActionReducerMapBuilder<S>) => void): [
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CaseReducers<S, any>,
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ActionMatcherDescriptionCollection<S>,
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CaseReducer<S, AnyAction> | undefined
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];
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