Exemple import

//------ lib.js ------
export const sqrt = Math.sqrt;
export function square(x) {
   return x * x;
}
export function diag(x, y) {
   return sqrt(square(x) + square(y));
}

//------ main.js ------
import { square, diag } from 'lib';
console.log(square(11)); // 121
console.log(diag(4, 3)); // 5

//------ other.js ------
import * as lib from 'lib';
console.log(lib.square(11)); // 121
console.log(lib.diag(4, 3)); // 5