Node: ReferenceError: require is not defined

Question

The source code is :

const Sequelize = require('sequelize');
const sequelize = new Sequelize(process.env["DSN"]);

When trying to exec via node (I insist, I'm not trying to exec this code in my browser), I get :

$ node Sequelize.js
file:///Users/snwfdhmp/project/Sequelize.js:1
const Sequelize = require('sequelize');
                  ^

ReferenceError: require is not defined
    at file:///Users/snwfdhmp/project/Sequelize.js:1:19
    at ModuleJob.run (internal/modules/esm/module_job.js:138:23)
    at async Loader.import (internal/modules/esm/loader.js:178:24)

Why does that happen ? Every article on the internet says "Don't use require() in browsers", but I'm not using a browser.

I'm using node v14.4.0 on macOS 10.15.5.

Tamas Szoke · Accepted Answer · 2020-06-10 18:31:36Z

2

If you defined "type": "module" in your package.json, you should remove it.

The reason is, certain CommonJS variables are not available in ES modules (reference), these are:

require
exports
module.exports
__filename
__dirname

However, require can be imported into an ES module using module.createRequire().

edited Jun 10, 2020 at 18:31

answered Jun 10, 2020 at 16:54

Tamas Szoke

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