TESTCAFÉ: The page URL is expected to be a string, but it was object

Our objective is to get the value of url and sitelab element from the CLI. Then append it in the fixture.page().

Run command: testcafe edge testfile.js --url="https://www.google.com" --sitelab="grp"

//testfile.js

 const siteURL1 = sitelabURL();

 fixture('Header -POC').page(siteURL1());

//From below code trying to generate URL from a command line

export const url1 = () => {
    let URL = 'https://www.google.com';
    const URL_KEY = '--url';
     process.argv.forEach((val) => {
     const keyValuePair = val.split('=');
     if (URL_KEY === keyValuePair[0]) {
        URL = keyValuePair[1];
       }
   });
  return URL;
  };


export async function sitelab() {
let SITELAB = 'sitelab:T1';
const SITELAB_KEY = '--sitelab';
process.argv.forEach((val) => {
    const keyValuePair = val.split('=');
    if (SITELAB_KEY === keyValuePair[0]) {
    SITELAB = keyValuePair[1];
    }
});
return SITELAB;
};

export const sitelabURL = async () => {
    // sitelab();
    var localURL = url1();
    var sitelab1 = await sitelab();
    var tld = localURL.indexOf('.com') > 0 ? 'com' : 'co.jp';
    if(sitelab1=true){
        var sitelabURL = 'http://www.google.'+tld+'/cookie.html?url='+localURL+'&rc='+sitelab1;
        return sitelabURL.toString();
    }
    else {
        return localURL.toString();
    }
}

Actual Result:

TypeError: sitelabURL1 is not a function

Expected Result:

Value should be successfully appended in the fixture and the page should be loaded

Note: I tried with fixture('Header -POC').page(siteURL1); as well. Here the result is The page URL is expected to be a string, but it was object.