Fix: [Section] Scalable Application Structure

[Ghostofcaldera]

Fixes #42

This PR addresses the IssueHunt-funded issue #42.

[gemini-code-assist]

Code Review

This pull request introduces a comprehensive documentation guide for building a scalable React, Redux, and TypeScript application structure using feature-based grouping. The guide includes code examples for Redux slices, public API entry points, dynamic store configurations, and feature flags. The review feedback highlights a few discrepancies and improvements in the code examples: defining missing selectors in the slice example, correcting the import style of reducers in the store configuration to match their named exports, and typing the dynamically enabled reducers as Partial<typeof allReducers> instead of Record<string, any> to preserve TypeScript type safety.

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[gemini-code-assist]

The public API example (index.ts) in the next section attempts to export selectUser and selectIsAuthenticated from ./slices/authSlice. However, these selectors are not defined in authSlice.ts. Defining them here makes the example complete and functional.

Suggested change

	export const { loginStart, loginSuccess, loginFailure, logout } = authSlice.actions;
	export default authSlice.reducer;
	export const { loginStart, loginSuccess, loginFailure, logout } = authSlice.actions;
	export const selectUser = (state: { auth: AuthState }) => state.auth.user;
	export const selectIsAuthenticated = (state: { auth: AuthState }) => state.auth.isAuthenticated;
	export default authSlice.reducer;

[gemini-code-assist]

In the public API pattern (index.ts), the reducers are exported as named exports (e.g., export { default as authReducer } from './slices/authSlice'). Importing them as default imports here will result in undefined at runtime. They should be imported as named imports instead.

Suggested change

	import authReducer from '../features/auth';
	import productsReducer from '../features/products';
	import cartReducer from '../features/cart';
	import { authReducer } from '../features/auth';
	import { productsReducer } from '../features/products';
	import { cartReducer } from '../features/cart';

[gemini-code-assist]

Typing enabledReducers as Record<string, any> causes Redux Toolkit's configureStore to lose type safety, resulting in RootState being inferred as Record<string, any>. Typing it as Partial<typeof allReducers> preserves TypeScript type safety for the store's state.

Suggested change

	const enabledReducers = Object.keys(allReducers).reduce((acc, key) => {
	const featureKey = key as keyof typeof allReducers;
	if (featureFlags[featureKey]) {
	acc[featureKey] = allReducers[featureKey];
	}
	return acc;
	}, {} as Record<string, any>);
	const enabledReducers = Object.keys(allReducers).reduce((acc, key) => {
	const featureKey = key as keyof typeof allReducers;
	if (featureFlags[featureKey]) {
	acc[featureKey] = allReducers[featureKey];
	}
	return acc;
	}, {} as Partial<typeof allReducers>);

[Ghostofcaldera]

Hi @piotrwitek, this PR is ready for review and addresses an IssueHunt bounty. Please review and merge when you have a moment. Thank you!

[Ghostofcaldera]

Closing as duplicate. The latest fix is in PR #338. Apologies for the noise — improving the automation.