58 lines
1.5 KiB
TypeScript
58 lines
1.5 KiB
TypeScript
import R from 'remeda';
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import { Action, ActionGenerator } from './actions';
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/**
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* Configuration object typically passed to the constructor of the class Updux.
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*/
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export interface UpduxConfig<TState = any, TActions extends Record<string,ActionGenerator> = Record<string,ActionGenerator>, TSubduxes = {}> {
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/**
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* Local initial state.
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* @default {}
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*/
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initial?: TState;
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actions?: TActions;
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/**
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* Subduxes to be merged to this dux.
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*/
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subduxes?: TSubduxes;
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}
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type StateOf<D> = D extends { initial: infer I } ? I : unknown;
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export type DuxStateSubduxes<C extends {}> = keyof C extends never
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? unknown
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: { [K in keyof C]: StateOf<C[K]> };
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export class Updux<TState extends any = {}, TActions extends { [key: string]: ActionGenerator } = {}, TSubduxes = {}> {
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#localInitial: any = {};
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#subduxes;
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#actions : TActions;
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constructor(config: UpduxConfig<TState, TActions, TSubduxes>) {
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this.#localInitial = config.initial ?? {};
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this.#subduxes = config.subduxes ?? {};
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this.#actions = config.actions ?? ([] as any);
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}
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get actions() {
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return this.#actions;
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}
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get initial(): TState & DuxStateSubduxes<TSubduxes> {
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if (Object.keys(this.#subduxes).length === 0) return this.#localInitial;
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return Object.assign(
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{},
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this.#localInitial,
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R.mapValues(this.#subduxes, ({ initial }) => initial),
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);
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}
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get reducer() {
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return (state, action) => state;
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}
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}
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