what import does in javascript code example

Example 1: javascript import

import { module } from "./path"; // single module
import Module from "./path"; // default export

import Module, { module } from "./path"; // both

Example 2: import javascript

/*Imagine a file called math_functions.js that contains several functions
related to mathematical operations. One of them is stored in a variable called
add.*/

//If you want to import one item:
import { add } from './math_functions.js';

//If you want to import multiple items:
import { add, someothervariable } from './math_functions.js';