I write this code for better performance but it didnt run and has many errors .can anybody help me?

const { GPU } = require('gpu.js');
const gpu = new GPU();
    var randomHex = require("randomhex");
const settings = {
    output: [1]
};

const exampleKernel = gpu.createKernel(function(x) {

    var tt=randomHex(32)
 return tt;
}, settings);
console.log(exampleKernel(25)[0]);

error:

    throw this.astErrorOutput(`Markup type ${ type } not handled`, varDecNode);