Use javascript file inside typescript file

Ionic Framework ionic-v3
1

Hello everyone,
I have a little Ionic2 project where I want to use some external Javascript functions to handle the animation of a circle. How can I insert and use this JS file inside the Typescript of Ionic2?

The Javascript file is something like this:

$("#start").click(function(){
$("#circle").animate({height: “250px”,width:“250px”},4001,color);
});

function color(){
$("#circle").css(“background”,"#CCCC99");
setTimeout(shrink,7000);
}

function shrink(){
$("#circle").css(“background”,"#D45757");
$("#circle").animate({height: “120px”,width:“120px”},8000,grow);
}

function grow(){
$("#circle").css(“background”,"#aa8cc5");
$("#circle").animate({height: “250px”,width:“250px”},4001,color);
}

Thanks in advance for your support!