Inconsistent API key setup in documentation

[josch87]

Current Node/TypeScript docs (v3.0.1) show setting the API key via authentications.apiKey.apiKey, which in TypeScript requires an any cast and violates @typescript-eslint/no-explicit-any.

let emailAPI = new TransactionalEmailsApi();
(emailAPI as any).authentications.apiKey.apiKey = "xkeysib-xxxxxxxxxxxxxxxxxxxxx";

or

let contactAPI = new ContactsApi();
(contactAPI as any).authentications.apiKey.apiKey = "xkeysib-xxxxxxxxx";

Other sections for v3+ show setApiKey with ApiKeys enums, which is type-safe.

import { TransactionalEmailsApi, TransactionalEmailsApiApiKeys } from '@getbrevo/brevo';

const transactionalEmailsApi = new TransactionalEmailsApi();
transactionalEmailsApi.setApiKey(TransactionalEmailsApiApiKeys.apiKey, 'xkeysib-API_KEY');

This inconsistency causes confusion and lint errors.

Other possible example with environment variable

Non-Null-Assertion

import { TransactionalEmailsApi, TransactionalEmailsApiApiKeys } from '@getbrevo/brevo';

const transactionalEmailsApi = new TransactionalEmailsApi();
transactionalEmailsApi.setApiKey(
  TransactionalEmailsApiApiKeys.apiKey,
  process.env.BREVO_API_KEY!,
  );

or even better

With Falsy-Check

import { TransactionalEmailsApi, TransactionalEmailsApiApiKeys } from '@getbrevo/brevo';

const apiKey = process.env.BREVO_API_KEY;
if (!apiKey) {
  throw new Error("BREVO_API_KEY not found in environment variables");
}

const transactionalEmailsApi = new TransactionalEmailsApi();
transactionalEmailsApi.setApiKey(TransactionalEmailsApiApiKeys.apiKey, apiKey);