node js hello world for sample or test with oop

tester.js

/*
file tester with node js oop
help from:

https://stackoverflow.com/questions/9071573/is-there-a-simple-way-to-make-a-random-selection-from-an-array-in-javascript-or
https://stackoverflow.com/questions/951021/what-is-the-javascript-version-of-sleep
https://stackoverflow.com/questions/18188083/javascript-oop-in-nodejs-how
*/

class Tester {
    constructor(text){
        this.text = text
        this.colors = [
            "\x1b[1;31m", "\x1b[1;32m", "\x1b[1;33m", "\x1b[1;37m",
            "\x1b[1;34m"
        ]
        this.time = 10000
    }

    async run(){
        for (var i of `[ ${this.text} ]\n`){
            var color = this.colors[Math.floor(Math.random() * this.colors.length)]
            process.stdout.write(
                `${color}${i}`
            )
            await new Promise(r => setTimeout(r, 100));
        }
    }
}

(new Tester("Hello World")).run()