How to access functions defined from one file to other via intellisense with vscode (visual studio) in javascript?

Consider folder structure as below in javascript project built-in Visual Studio 1.43

/Folder1
   /testFunctions1.js
       /function1()
       /function2()
       ...

/Folder2
   /testFunctions2.js
      require('testFunctions1.js') //to include 

      functio //Here If I press ctrl+space, I expect suggestions of functions defined in testFunctions1.js

How do I achieve it in java-script?

pre-reqs: javascript/Visual Studi 1.43 (2020)

Update 1:

../Folder1/testFunctions1.js
test1 : function()
{
    ..
    ..
}

test2 : function()
{
    ..
    ..
}

../Folder2/testFunctions2.js
require('../Folder1/testFunctions1.js')

test (ctrl+space) //expect suggestions here

Update 2:

   function doSomething1() {
    ..
    }

    function doSomething2() {
    ..
    }

If I include above with reference, I get suggestions - It works.

But If I have functions in below format then, it fails. I want doSomething in suggestions.

//testFunctions1.js
define('../mypageobjects/PageObject.js', 
[
   '../test/tests.js'
], 

function (PageObject,commonLibWidget){
    var test = PageObject.extend('test', {       
    check: function () {
        return true;
    },

    selectors: {
        //home page
        widgetHeader: '.moduleHeader_tle',
    },

    commands: {

        doSomething1: function(){ //I want this function name - doSomething1
            return this
        },

         doSomething2: function(){ //I want this function name - doSomething2
            return this
        },     

    }  //commands close

    }); //pageobject.extend
    return test;
}); //main function

Try adding the following comment to the top of your testFunctions2.js file:

/// <reference path="../Folder1/testFunctions1.js" />

This should work in Visual Studio and VSCode.

See also: What is reference path in vscode