clean-redux/src/usecasesToReducer.ts

Utilities for implementing clean architecture using Redux

import "minimal-polyfills/Object.fromEntries";
import type { Reducer } from "@reduxjs/toolkit";

export function usecasesToReducer<Usecase extends { name: string; reducer: Reducer | null }>(
    usecases: readonly Usecase[],
): RemoveNullProperties<{
    [Key in Usecase["name"]]: Extract<Usecase, { name: Key }>["reducer"];
}> {
    return Object.fromEntries(
        usecases.map(({ name, reducer }) => [name, reducer]).filter(([, reducer]) => reducer !== null),
    ) as any;
}

type NonNullPropertyNames<O> = {
    [Key in keyof O]: O[Key] extends null ? never : Key;
}[keyof O];

type RemoveNullProperties<O> = { [Key in NonNullPropertyNames<O>]: O[Key] };