76 lines
1.9 KiB
JavaScript
76 lines
1.9 KiB
JavaScript
import R from 'remeda';
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import { action } from './actions.js';
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function isActionGen(action) {
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return typeof action === 'function' && action.type;
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}
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export class Updux {
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#localInitial = {};
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#subduxes = {};
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#actions;
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#mutations = {};
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#config = {};
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constructor(config = {}) {
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this.#config = config;
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this.#localInitial = config.initial ?? {};
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this.#subduxes = config.subduxes ?? {};
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this.#actions = R.mapValues(config.actions ?? {}, (arg, name) =>
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isActionGen(arg) ? arg : action(name, arg),
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);
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Object.entries(this.#subduxes).forEach(([slice, sub]) =>
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this.#addSubduxActions(slice, sub),
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);
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}
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#addSubduxActions(_slice, subdux) {
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if (!subdux.actions) return;
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// TODO action 'blah' defined multiple times: <where>
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Object.entries(subdux.actions).forEach(([action, gen]) => {
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if (this.#actions[action]) {
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if (this.#actions[action] === gen) return;
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throw new Error(`action '${action}' already defined`);
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}
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this.#actions[action] = gen;
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});
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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() {
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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) => this.upreducer(action)(state);
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}
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get upreducer() {
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return (action) => (state) => {
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const mutation = this.#mutations[action.type];
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if (mutation) {
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state = mutation(action.payload, action)(state);
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}
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return state;
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};
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}
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setMutation(action, mutation) {
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this.#mutations[action.type] = mutation;
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}
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}
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