The import functionality implementation of commonjs (and then node) is done via the require function
require basically:
It is the built-in statement from the commonjs module format to load module.
require permits to load CommonJs Module whereas the import statement permits to load ESM module
Node.js follows by default the commonJs format, if you want to use import, you need to:
If the code is run directly on Node without any other tool, the require node function is used to resolve (find) the dependency.
The below require statement called from a module located at path Y
require(X)
where:
Require will resolve the module location with the following algo:
More .. see high-level algorithm in pseudocode of what require.resolve() does
If the exact filename is not found, then Node.js will attempt to load the required filename with the added extensions:
Local Package installed with Javascript - npm (Node package manager)
var demo=require('package-name');
demo.printMsg
const { PI } = Math;
exports.area = (r) => PI * r ** 2;
exports.circumference = (r) => 2 * PI * r;
// loads the module circle.js that is in the same directory as foo.js.
const circle = require('./circle.js');
console.log(`The area of a circle of radius 4 is ${circle.area(4)}`);