web/config.js

function load(envName) {
    return {
        ...require('./config/base.json'),
        ...loadConfig(envName),
        ...loadConfig('local'),
    };
}

function log(configObj) {
    const repeatNum = 50;
    console.log(`${"=".repeat(repeatNum)}\nenvConfig`);
    console.log(JSON.stringify(configObj, null, 2));
    console.log(`${"=".repeat(repeatNum)}`);
}

function loadConfig(configName) {
    try {
        return require(`./config/${configName}.json`);
    } catch (e) {
        if (e instanceof Error && e.code === "MODULE_NOT_FOUND") {
            return {};
        }
        else {
            throw e;
        }
    }
}

module.exports = {
    load,
    log
};