확장성을 지원하도록 Node 프로젝트 환경을 구성하는 방법은 무엇입니까?

npm install dotenv --save
npm install dotenv-expand --save

/**
 * 解析环境变量文件
 * @param {*} mode
 */
const loadEnv = (mode) => {
  const basePath = path.resolve(__dirname, `.env${mode ? `.${mode}` : ``}`);
  const localPath = `${basePath}.local`;

  const load = (envPath) => {
    try {
      const env = dotenv.config({ path: envPath, debug: process.env.DEBUG });
      dotenvExpand(env);
    } catch (err) {
      if (err.toString().indexOf("ENOENT") < 0) {
        console.error(err);
      }
    }
  };

  load(localPath);
  load(basePath);
};

/**
 * 获取符合前缀规则的环境变量对象
 */
const prefixRE = /^XXTX_APP_/;
const resolveClientEnv = () => {
  const env = {};
  Object.keys(process.env).forEach((key) => {
    if (prefixRE.test(key) || key === "NODE_ENV") {
      env[key] = process.env[key];
    }
  });
  return env;
};

const webpack = require("webpack");
const { loadEnv, resolveClientEnv } = require("./env-helper");
// 解析环境配置文件
// 通过cross-env 再scripts中配置NODE_ENV=development
loadEnv(process.env.NODE_ENV);
// 获取符合规则的环境配置对象
const env = resolveClientEnv();

const HelloWorldPlugin = require("./hello-world");

module.exports = {
  mode: "development",
  plugins: [
    new webpack.DefinePlugin(env),
    new HelloWorldPlugin({ options: true }),
  ],
};

class HelloWorldPlugin {
  apply(compiler) {
    compiler.hooks.done.tap("HelloWorldPlugin", () => {
      console.log("Hello World!");
      console.log("[ XXTX_APP_NAME ] >", process.env.XXTX_APP_NAME);
      console.log("[ XXTX_APP_BASE_URL ] >", process.env.XXTX_APP_BASE_URL);
    });
  }
}

module.exports = HelloWorldPlugin;