Prima installa la nostra libreria con npm:
            $ npm i gender-api.com-client --save
import {Client as GenderApiClient, ResultSingleName} from "gender-api.com-client";
const genderApiClient = new GenderApiClient("your API key");
try {
    genderApiClient.getByFirstName('theresa', (response: ResultSingleName) => {
      console.log(response.gender); 
      console.log(response.accuracy); 
    });
    genderApiClient.getByFirstNameAndCountry('john', 'US', (response: ResultSingleName) => {
      console.log(response.gender); 
      console.log(response.accuracy); 
    });
}
catch(e) {
  console.log('Error:', e);
}
          Consulta la documentazione completa del cliente qui:
          https://github.com/markus-perl/gender-api-client-npm