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felix0000
Asked: 2020-10-15 10:01:12 +0800 CST 2020-10-15 10:01:12 +0800 CST

Export and import classes in NODE JS

  • 772

I am trying to create a module from a class but when importing it an error is generated.

C:\Program Files\nodejs\node.exe --inspect-brk=16691 applog.js Debugger listening on ws://127.0.0.1:16691/eb2bbf-a502-435d-9785-efae3b332 For help,see: https: //nodejs.org/en/docs/inspector Debugger attached.

Waiting for c:\temp\node\logs_old\applog.js:2 import Logs from ("./Modulo/logs.js"); ^^^^^^

SyntaxError: Cannot use import statement outside a module at Module._compile (internal/modules/cjs/loader.js:892:18) at Object.Module._extensions..js (internal/modules/cjs/loader.js:973: 10) at Module.load (internal/modules/cjs/loader.js:812:32) at Function.Module._load (internal/modules/cjs/loader.js:724:14) at Function.Module.runMain (internal /modules/cjs/loader.js:1025:10) at internal/main/run_main_module.js:17:11 he debugger to disconnect...

logs.js class file

class Logs{
  // Modulo exportado
  constructor(path,name,data){
    this.path = path;
    this.name = name;
    this.data = data;
    console.log("Objeto log creado OK.");
  }

  getPath() {
    return this.path;
  }
  getName() {
    return this.name;
  }
  getData() {
    return this.data;
  }

  setPath(newPath){
    this.path = newPath;
  }

  setName(newName){
    this.name = newName;
  }

  setData(newData){
    this.data = newData;
  }
}
export default Logs;

applog.js file

// Importar clases
import Logs from ("./Modulo/logs.js");

// Creacion de objeto
//var applogInstance = new logs();

// Pruebas de metodos
//applogInstance.write('./app.log','app.log','987654');

How to import classes in JavaScript

javascript

1 Answers

  1. Best Answer

    I have performed the following test where I can solve what you indicate.

    I have modified your logs.js file to the following:

    class Logs{
  // Modulo exportado
  constructor(path,name,data){
    this.path = path;
    this.name = name;
    this.data = data;
    console.log("Objeto log creado OK.");
  }

  getPath() {
    return this.path;
  }
  getName() {
    return this.name;
  }
  getData() {
    return this.data;
  }

  setPath(newPath){
    this.path = newPath;
  }

  setName(newName){
    this.name = newName;
  }

  setData(newData){
    this.data = newData;
  }
}
module.exports = Logs;

    and I call it as follows:

    const Logs = require("./logs.js");
var newInstance = new Logs();

    generating the output you have defined in the constructor

    λ node index.js
Objeto log creado OK.
    • 1