Make a call in telegram using GramJS

call.ts

import { StoreSession} from "telegram/sessions";
import { TelegramClient } from "telegram/client/TelegramClient";

import { Api } from "./tl";

import { generateRandomBigInt, readBigIntFromBuffer, readBufferFromBigInt, sha256 } from "telegram/Helpers";
import bigInt from "big-integer";


const apiId = ;
const apiHash = "";
(async () => {
    console.log("Loading interactive example...");
    const session = new StoreSession("my_session");
    const client = new TelegramClient(session, apiId, apiHash, {});
    await client.connect();
    const dhConfig = await client.invoke(new Api.messages.GetDhConfig({
        version: 0,
        randomLength: 256
    }));
    if (dhConfig instanceof Api.messages.DhConfigNotModified) {
        throw Error("Invalid DHConfig");
    }
    let a = bigInt.zero;
    let p = readBigIntFromBuffer(dhConfig.p, false, false);
    let g = bigInt(dhConfig.g);
    while (!(bigInt.one.lesser(a) && a.lesser(p.minus(1)))) {
        a = generateRandomBigInt();
    }
    const ga = g.modPow(a, p);
    const gaHash = await sha256(readBufferFromBigInt(ga, 256, false, false));
    const userToCall = "username";
    const res = await client.invoke(new Api.phone.RequestCall({
        userId: userToCall,
        gAHash: gaHash,
        randomId: Math.floor(Math.random() * 0x7ffffffa),
        protocol: new Api.PhoneCallProtocol({
            minLayer: 93,
            maxLayer: 93,
            udpP2p: true,
            udpReflector: true,
            libraryVersions: [
                // taken from TDESKTOP
                "4.0.0",
                "3.0.0",
                "2.7.7",
                "2.4.4"
            ]
        })
    }));
    console.log("CALL HAS STARTED!");
    console.log("res is", res);
    //await client.sendMessage("me", { message: "Hello!" });

})();