Question

我有一个index.js文件，该文件具有以下导出功能：

const mainPipe = require('./mainPipe')
const mongooseDriverPipe = require('./mongooseDriverPipe')
const neo4jDriverPipe = require('./neo4jDriverPipe')
const postgreDriverPipe = require('./postgreDriverPipe')
const redisDriverPipe = require('./redisDriverPipe')

exports.mainPipe = mainPipe
exports.mongooseDriverPipe = mongooseDriverPipe
exports.neo4jDriverPipe = neo4jDriverPipe
exports.postgreDriverPipe = postgreDriverPipe
exports.redisDriverPipe = redisDriverPipe

然后我导入：

const { mongooseDriverPipe } = require('../../pipes')
console.log(mongooseDriverPipe) // undefined

如果我：

const pipes = require('../../pipes')
console.log(pipes) // Logs an object with the above five keys
console.log(pipes.mongooseDriverPipe) // Logs the expected result

这还会返回undefined：

const test = require('../../pipes').mongooseDriverPipe
console.log(test) // undefined

我所有的路径都是正确的，当我不进行结构分解时，可以看到导出的对象及其所有键，但是当我尝试进行结构分解时，所有经结构化的键始终为undefined。

我不明白为什么键会被破坏为undefined。

Answer 1

尝试将此行添加到index.js文件的顶部；

module.exports = exports = {};

Require返回module.exports值。

您可以在此处查看更多信息，https://www.freecodecamp.org/news/node-js-module-exports-vs-exports-ec7e254d63ac/

如果愿意，也可以这样定义它们

module.exports = exports = {
    mainPipe : require('./mainPipe'),
    mongooseDriverPipe : require('./mongooseDriverPipe'),
    neo4jDriverPipe : require('./neo4jDriverPipe'),
    postgreDriverPipe : require('./postgreDriverPipe'),
    redisDriverPipe : require('./redisDriverPipe'),
}

销毁导入失败，所有键均未定义

1 个答案: