33 lines
1.4 KiB
JavaScript
33 lines
1.4 KiB
JavaScript
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import * as R from 'remeda';
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import u from '@yanick/updeep-remeda';
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import { D } from '@mobily/ts-belt';
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export function buildReducer(initialStateState, mutations = [], defaultMutation, subduxes = {}, inheritedReducer) {
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const subReducers = D.map(subduxes, D.getUnsafe('reducer'));
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const reducer = (state = initialStateState, action) => {
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if (!(action === null || action === void 0 ? void 0 : action.type))
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throw new Error('reducer called with a bad action');
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let active = mutations.filter(({ matcher }) => matcher(action));
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if (active.length === 0 && defaultMutation)
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active.push(defaultMutation);
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if (!active.some(R.prop('terminal')) && inheritedReducer) {
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active.push({
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mutation: (_payload, action) => (state) => {
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return u(state, inheritedReducer(state, action));
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},
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});
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}
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if (!active.some(R.prop('terminal')) &&
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D.values(subReducers).length > 0) {
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active.push({
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mutation: (payload, action) => (state) => {
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return u(state, R.mapValues(subReducers, (reducer, slice) => (state) => {
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return reducer(state, action);
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}));
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},
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});
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}
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return active.reduce((state, { mutation }) => mutation(action.payload, action)(state), state);
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};
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return reducer;
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}
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