Exporting

We first do exports as highlighted.

Let the name of this file be foo.js.

const mongoose = require("mongoose");

const rectangleSchema = mongoose.Schema({
    width: {
        type: Number,
        required: [true, 'Width is required']
    },
    height: {
        type: Number,
        required: [true, 'Height is required']
    }
});

const schemaClass = mongoose.model('rectangles', rectangleSchema);

//Exporting
exports.Rectangle = schemaClass;

Using exports

From a client file (e.g., foo-user.js) we then import Rectangle as highlighted.

const {Rectangle} = require('./foo');

Coding module.exports

We change the export as highlighted.

//Exporting
//exports.Rectangle = schemaClass;
module.exports = schemaClass;

Using module.exports

For module.exports we have to change the import as highlighted.

const Rectangle = require('./foo');