TypeError -在使用i18next时无法读取未定义属性的“使用”

Question

我有一个具有以下依赖项的项目：

 "dependencies": {
    "@hapi/joi": "^17.1.1",
    "bcrypt": "^5.0.1",
    "config": "^3.3.7",
    "express": "^4.17.3",
    "express-async-errors": "^3.1.1",
    "express-rest-i18n": "^1.0.1",
    "http-status-codes": "^2.2.0",
    "i18next": "^21.6.14",
    "i18next-http-backend": "^1.4.0",
    "i18next-http-middleware": "^3.2.0",
    "joi": "^17.4.2",
    "lodash": "^4.17.21",
    "mongoose": "^6.2.4",
    "validator": "^13.7.0"
  },

我的i18n配置代码如下：

const i18next = require("i18next").default;
const Backend = require("i18next-http-backend").default;
const i18nextMiddleware = require("i18next-http-middleware");

i18next
  .use(Backend)
  .use(i18nextMiddleware.LanguageDetector)
  .init({
    backend: {
      loadPath: __dirname + `/locales/{{lng}}/{{ns}}.json`,
    },
    fallbackLng: "en",
    preload: ["en"],
  });

module.exports = { i18next };

我的应用程序代码如下：

const { i18next } = require("../locales/i18n");
const messages = require("../locales/en/translation.json");
const i18nextMiddleware = require("i18next-http-middleware");

require("express-async-errors");
const express = require("express");

const app = express();
app.use(express.json());
app.use(i18nextMiddleware.handle(i18next));

app.get("*", (req, res) => {
  const response = req.t("greeting");
  res.status(200);
  res.send(response);
});

const port = process.env.PORT || 3000;
module.exports = app.listen(port, () =>
  console.log(`Listening on port: ${port}`)
);

当我通过运行npm启动应用程序时，我会收到错误: TypeError:无法读取未定义的属性“使用”

存在此错误是因为配置文件中的后端未定义。我使用了https://www.npmjs.com/package/i18next-http-middleware作为资源。

为什么我会收到这个错误，我如何修复这个错误？

Answer 1

你为什么要访问.default？

就像这样进口：

const i18next = require("i18next");
const Backend = require("i18next-http-backend");