从main.js导出模块时我出了什么问题？

Question

Learning how to develop modules I'm trying to learn how to export one from main.js . On my renderer I can send it correctly to main with:

renderer.js:

let _object = {
    foo: foo1,
    bar: bar1,
}
ipcRenderer.send('channel', _object)

in main.js I can get this correctly:

ipcMain.on('channel', (e, res) => {
  console.log(JSON.stringify(res))
  console.log(typeof res)
})

however when I export the result from main.js and try to bring it into another file I get an undefined :

main.js:

const foobar = require('./foobar')

ipcMain.on('channel', (e, res) => {
  console.log(JSON.stringify(res))
  console.log(typeof res)

  module.exports.res = res
  foobar.testing()
})

foobar.js:

const res = require('./main')

module.exports = {
    testing: function(res) {
        console.log(`Attempting console.log test: ${res}`)
        console.log(res)
        console.log(JSON.stringify(res))
    }
}

terminal result:

Attempting console.log test: undefined 
undefined
undefined

I've also tried to redefine the object in main.js :

ipcMain.on('channel', (e, res) => {
  module.exports =  {
        foo: foo,
        bar: bar,
    }
  console.log(`Testing object ${res.foo}`)

  foobar.testing()
})

My research of reference:

• Node js object exports
• Node module.exports returns undefined

What a I doing wrong in my export of the result in main.js so I can use it in a different file?

Edit:

My end goal is to learn how to be able to call res.foo in foobar.js .

Answer 1

First of all, you have an argument res in your testing function, which shadows the import. Second, the imported res object is all exports from main , which includes the res you need - so you should print res.res instead of the whole object.

Foobar.js:

const res = require('./main')

module.exports = {
    testing: function() {
        console.log(`Attempting console.log test: ${res.res}`)
        console.log(res.res)
        console.log(JSON.stringify(res.res))
    }
}

The last version (where you reassign module.exports ) would not work, because foobar will still have the original exports, which was an empty object.