nested-combine-reducers/dist/index.js

Allows you to create your root reducer in one go, instead of individually combine slice reducers

import { combineReducers } from "redux";
/**
 * Takes a Reducers maps with multiple levels of nesting and turns it into in a single reducing function.
 *
 * @param map An object whose values are either reducing functions or other objects
 */
export function nestedCombineReducers(map) {
    if (!map)
        throw new Error('You must specify a reducers map.');
    const flatReducersMapObject = {};
    const recursiveMapKeys = Object.keys(map);
    for (const recursiveMapKey of recursiveMapKeys) {
        const recursiveMapValue = map[recursiveMapKey];
        if (recursiveMapValue === null) {
            continue;
        }
        if (recursiveMapValue === undefined) {
            continue;
        }
        //Hopefully a reducer function, let's store it to combine it later
        if (typeof recursiveMapValue === 'function') {
            const reducer = recursiveMapValue;
            flatReducersMapObject[recursiveMapKey] = reducer;
        }
        //Nesting found, let's go deeper !
        if (typeof recursiveMapValue === 'object') {
            const nestedRecursiveReducersMapObject = recursiveMapValue;
            flatReducersMapObject[recursiveMapKey] = nestedCombineReducers(nestedRecursiveReducersMapObject);
        }
    }
    //Once all the properties have been processed, the ReducersMap is no longer incomplete and can be combined one last time
    return combineReducers(flatReducersMapObject);
}
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