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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 | 5x 4x 4x 4x 4x 3x 1x 23x 23x 23x 48x 23x 23x 253x 253x 253x 23x 48x 3x 2x 2x 1x 1x 3x 2x 2x 2x 1x 1x 1x 2x 2x 2x 19x 22x 19x 2x 25x 42x 42x 42x 13x 30x 66x 66x 33x 66x 66x 41x 66x 24x 22x 24x | import { produce } from 'immer'; import { AC, Flatten, ExtractPayload, Reducer, ActionLike, ActionType, } from './types'; import { toArray, getACType } from './utils'; export type OnHandler<S, T extends AC> = ( state: S, payload: ExtractPayload<ReturnType<T>>, action: Flatten<ReturnType<T> & { type: string }> ) => void; export type ReplaceHandler<S, T extends AC> = ( state: S, payload: ExtractPayload<ReturnType<T>>, action: Flatten<ReturnType<T> & { type: string }> ) => S; export type AttachFn<S> = { <T extends keyof S>(prop: T, fn: Reducer<S[T]>): ChainedReducer<S>; (fn: Reducer<S>): ChainedReducer<S>; }; const createNestedReducer = <S, P extends keyof S>( prop: P, reducer: Reducer<S[P]> ): Reducer<S> => (state, action) => { Iif (typeof state === 'undefined') { throw new Error( 'tried to create createNestedReducer with undefined parent state' ); } const subState = reducer(state[prop], action); if (state[prop] !== subState) { return { ...state, [prop]: subState, }; } return state; }; export class ChainedReducer<S> { private reducerMap: Map<symbol, Map<string, Array<Reducer<S>>>>; private defaultReducers: Array<Reducer<S>>; private reducer: ChainedReducer<S> & Reducer<S> | null; constructor(private initial: S) { this.reducerMap = new Map(); this.defaultReducers = []; this.reducer = null; } asReducer() { if (!this.reducer) { const reducer: any = this.getReducer(); Object.getOwnPropertyNames(ChainedReducer.prototype).forEach(key => { const prop = (this as any)[key]; Eif (typeof prop === 'function') { reducer[key] = prop.bind(this); } }); this.reducer = reducer; } return this.reducer!; } attach<T extends keyof S>(fn: Reducer<S>): ChainedReducer<S> & Reducer<S>; attach<T extends keyof S>( prop: T, fn: Reducer<S[T]> ): ChainedReducer<S> & Reducer<S>; attach<T extends keyof S>(prop: T | Reducer<S>, fn?: Reducer<S[T]>) { if (typeof prop === 'string') { Iif (typeof fn !== 'function') { throw new Error('fn must be a function'); } this.defaultReducers.push(createNestedReducer(prop, fn)); } else { Iif (typeof prop !== 'function') { throw new Error('fn must be a function'); } this.defaultReducers.push(prop); } return this.asReducer(); } replace<T extends AC>(actionCreator: T, fn: ReplaceHandler<S, T>) { this.transform( actionCreator, (state, action: any) => produce(state, draft => fn(draft as S, action.payload, action))! ); return this.asReducer(); } mergePayload(actionCreators: AC) { this.transform(actionCreators, (state, action: any) => Object.assign({}, state, action.payload) ); return this.asReducer(); } nested<T extends keyof S>( prop: T, fn: (reducer: ChainedReducer<S[T]>) => ChainedReducer<S[T]> ) { const nested = fn(new ChainedReducer(this.initial[prop])); this.defaultReducers.push(createNestedReducer(prop, nested.getReducer())); return this.asReducer(); } on<T extends AC>(actionCreator: T, fn: OnHandler<S, T>) { this.transform( actionCreator, (state, action: any) => produce(state, draft => fn(draft as S, action.payload, action))! ); return this.asReducer(); } onMany<T extends AC, T2 extends AC>( actionCreator: [T, T2], fn: OnHandler<S, T | T2> ): Reducer<S> & this; onMany<T extends AC, T2 extends AC, T3 extends AC>( actionCreator: [T, T2, T3], fn: OnHandler<S, T | T2 | T3> ): Reducer<S> & this; onMany(actionCreator: any, fn: OnHandler<S, AC>) { return this.on(actionCreator, fn); } private getReducer() { return (state: S = this.initial, action: ActionLike) => { Iif (!action.type) { throw new Error('action.type must be defined'); } const reducers = this.getReducers(action.type).concat( this.defaultReducers ); if (!reducers.length) { return state; } return reducers.reduce((prev, fn) => fn(prev, action), state); }; } private getReducers(actionType: ActionType) { const [symbol, type] = actionType!; if (!this.reducerMap.has(symbol)) { this.reducerMap.set(symbol, new Map()); } const map = this.reducerMap.get(symbol)!; if (!map.has(type)) { map.set(type, []); } return map.get(type)!; } private transform(actionCreators: AC | AC[], reducerFn: Reducer<S>) { const actionTypes = toArray(actionCreators).map(ac => getACType(ac)); actionTypes.forEach(action => { this.getReducers(action).push(reducerFn); }); } } |