core-native/lib/reducer.js

A lightweight framework based on React Native + Redux + Redux Saga, in strict TypeScript.

import { combineReducers } from "redux";
import { Exception, RuntimeException } from "./Exception";
// Redux Action: SetState (to update state.app)
const SET_STATE_ACTION = "@@framework/setState";
export function setStateAction(module, state, type) {
    return {
        type,
        name: SET_STATE_ACTION,
        payload: { module, state },
    };
}
function setStateReducer(state = {}, action) {
    // Use action.name for set state action, make type specifiable to make tracking/tooling easier
    if (action.name === SET_STATE_ACTION) {
        const { module, state: moduleState } = action.payload;
        return { ...state, [module]: { ...state[module], ...moduleState } };
    }
    return state;
}
export const LOADING_ACTION = "@@framework/loading";
export function loadingAction(show, identifier = "global") {
    return {
        type: LOADING_ACTION,
        payload: { identifier, show },
    };
}
function loadingReducer(state = {}, action) {
    if (action.type === LOADING_ACTION) {
        const payload = action.payload;
        const count = state[payload.identifier] || 0;
        return {
            ...state,
            [payload.identifier]: count + (payload.show ? 1 : -1),
        };
    }
    return state;
}
// Redux Action: Error (handled by saga)
export const ERROR_ACTION_TYPE = "@@framework/error";
export function errorAction(error) {
    if (process.env.NODE_ENV === "development") {
        console.warn("Error Caught:", error);
    }
    const exception = error instanceof Exception ? error : new RuntimeException(error && error.message ? error.message : "unknown error", error);
    return {
        type: ERROR_ACTION_TYPE,
        payload: exception,
    };
}
// Root Reducer
export function rootReducer() {
    return combineReducers({
        loading: loadingReducer,
        app: setStateReducer,
    });
}
// Helper function, to determine if show loading
export function showLoading(state, identifier = "global") {
    return state.loading[identifier] > 0;
}
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