accounts-frontend/packages/app/components/ui/popup/reducer.ts

import React from 'react';
import { combineReducers } from 'redux';

import { Action } from './actions';

export interface PopupConfig {
    Popup: React.ElementType;
    props?: Record<string, any>;
    // Don't allow hiding popup
    disableOverlayClose?: boolean;
}

export type State = {
    popups: Array<PopupConfig>;
};

export default combineReducers<State>({
    popups,
});

function popups(state: Array<PopupConfig> = [], { type, payload }: Action) {
    switch (type) {
        case 'POPUP_CREATE':
            if (!payload.Popup) {
                throw new Error('Popup is required');
            }

            return state.concat(payload);
        case 'POPUP_DESTROY':
            return state.filter((popup) => popup !== payload);
        default:
            return state;
    }
}