events and interval

test.mjs

import { EventEmitter } from 'events';

class Client extends EventEmitter {

    interval
    constructor() {
        super();
        this.interval = setInterval(() => { console.log("emit 1"); this.emit("onOrder", "1") }, 3000);
    }

    send() {
        return new Promise((resolve, reject) => {
            const check_order = (order) => {           
                if (order === "1") {  
                    this.removeListener('onOrder', check_order);             
                    clearInterval(this.inverval);
                    resolve(order);                    
                } 
            }
            this.on("onOrder", check_order) 
        })
    }
}

const client = new Client();
client.send().then((x) => console.log("result " + x))

// Output:
// emit 1
// result 1
// emit 1
// emit 1
// emit 1
// emit 1
// emit 1
// emit 1
// emit 1
// emit 1
// emit 1