Javascript, using require() and import in the same file

Question

I need to use require() in my file so I can use 'readline', but I also need to use import so I can use a module. But when I use require inside of my module it says require is not defined. Here is the code :

var r1 = require('readline')
import car from './carclass.mjs'
var input = ""
var questionToAsk = ""
const question1 = () => {
 return new Promise((resolve, reject) => {
 r1.question(questionToAsk, (answer) => {
 input = answer
 resolve()
 })
 r1.question()
 })
}
const main = async () => {
 console.log("What is the Brand?")
 await question1()
 var brandName = input
 console.log("What is the Model?")
 await question1()
 var modelName = input
 console.log("What is the Speed?")
 await question1()
 var carSpeed = input
 var newCar = new car(brandName,modelName,carSpeed)
 r1.close()
}
main()

How can I use require() and import in a module, or is there some other way I can approach this?

• jfriend00: Why don't you import rl from 'readline'?
• DeceivedRiver: Because it says r1.question() isn't a function
• jfriend00: I think that's because you were skipping the .createInterface() step. See the working code below in my answer.

Answer 1

to use import and require() you can try this

import { createRequire } from "module";
const require = createRequire(import.meta.url);

• Community: As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center.

Answer 2

import { createRequire } from "module";
const require = createRequire(import.meta.url);

Use this code on the top of the file in which you want to use 'IMPORT' and 'Require' both

Answer 3

I'd suggest you just use import instead of require() if you're already in an ESM module file since require() only exists in CJS modules, not ESM modules. Here's a code example that works:

import readline from 'readline';
const rl = readline.createInterface({
 input: process.stdin,
 output: process.stdout
});
rl.question("What's up?\n", data => {
 console.log(`Got your result: ${data}`);
 rl.close();
});

In node v12.13.1, I run this with this command line:

node --experimental-modules temp.mjs

FYI, from your comments, it appears you were skipping the .createInterface() step.