import { EnvironmentProviders } from '@angular/core';
import { RecaptchaServiceConfig } from './recaptcha.service';
/**
 * Provides reCAPTCHA configuration and automatic script preloading.
 *
 * **IMPORTANT:** When using with `NAUTH_CLIENT_CONFIG`, you must pass
 * `provideRecaptcha()` call MUST appear AFTER the `NAUTH_CLIENT_CONFIG` provider.
 *
 * Sets up `RECAPTCHA_CONFIG` and `RecaptchaService`. When called without config,
 * reads from `NAUTH_CLIENT_CONFIG.recaptcha` if available.
 *
 * @param config - Optional. reCAPTCHA config (enabled, version, siteKey, action).
 *   If omitted, will attempt to use `NAUTH_CLIENT_CONFIG.recaptcha`.
 *   Pass explicitly when not using NAuth or to override.
 * @returns Environment providers for reCAPTCHA
 *
 * @example With NAUTH_CLIENT_CONFIG (no duplication)
 * ```typescript
 * providers: [
 *   { provide: NAUTH_CLIENT_CONFIG, useValue: { baseUrl: '...', recaptcha: { enabled: true, version: 'enterprise', siteKey: '...', action: 'login' } } },
 *   provideRecaptcha(),  // reads NAUTH_CLIENT_CONFIG.recaptcha at runtime
 * ]
 * ```
 *
 * @example Without NAuth (explicit config)
 * ```typescript
 * provideRecaptcha({ enabled: true, version: 'v3', siteKey: '...', action: 'login' })
 * ```
 */
export declare function provideRecaptcha(config?: RecaptchaServiceConfig): EnvironmentProviders;