How can I import a library in worker?

[RachelCT1]

I am new in web worker. I want to find out whether I can use library or module in worker? I have tried to use import xxx， but I get "show3d.worker.js:1 Uncaught SyntaxError: Cannot use import statement outside a module". My code like this:
`

<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

<script>

   var worker =new Worker("show3d.worker.js");

    worker.postMessage("hello world");   

    worker.onmessage =function(evt){    

        console.log(evt.data);          

    }

</script>

and the show3d.worker.js like this:

import * as THREE from "three"

//importScripts('https://unpkg.com/d3-force-3d')

onmessage =function (evt){

var d = evt.data;

console.log("get data:",d);

postMessage( "return test data" );

}

`
I also tried "importScripts", but I can't get the library.

Thank you very much if you can give me some suggesions.