import type { PushResult } from '@stacksjs/types';
/**
 * Configure FCM with a service account
 *
 * Optional: without it, the credentials come from `config/services.ts`
 * (`FCM_PROJECT_ID`, `FCM_CLIENT_EMAIL`, `FCM_PRIVATE_KEY`). Anything set here
 * wins over config.
 */
export declare function configure(options: FCMConfig): void;
/** Forget what `configure()` set. For tests, and for a process that rotates keys. */
export declare function resetConfiguration(): void;
/**
 * A private key as it comes out of an env file.
 *
 * A service account JSON stores the PEM with `\n` escapes, and pasting it
 * into `.env` keeps them as two characters, so the base64 body arrives with
 * literal backslash-n sequences in it and `atob` rejects the key. Real
 * newlines pass through untouched.
 */
export declare function normalizePrivateKey(key: string): string;
/**
 * The credentials a request uses: what `configure()` set, then the app's
 * `config/services.ts`.
 *
 * `config/services.ts` declared all three FCM values and nothing read them, so
 * an app that set the documented env vars got "not configured" back
 * (stacksjs/stacks#2857). Resolved per call, after the app's config has
 * loaded, so a value set in `config/services.ts` is never shadowed by the
 * framework default it replaced.
 */
export declare function resolveConfig(): Promise<FCMConfig>;
/**
 * Build the signed JWT that Google's OAuth2 endpoint accepts as a service
 * account assertion.
 *
 * `nowSeconds` is a parameter rather than a `Date.now()` read so the encoding
 * can be asserted against a fixed claim set.
 */
export declare function buildServiceAccountAssertion(clientEmail: string, privateKey: string, nowSeconds: number): Promise<string>;
/** Forget every cached access token. For tests, and after rotating a key. */
export declare function clearAccessTokens(): void;
/**
 * Send push notification via FCM v1 API (using service account)
 */
export declare function send(message: FCMMessage): Promise<PushResult>;
/**
 * Send to multiple tokens
 */
export declare function sendMulticast(tokens: string[], message: Omit<FCMMessage, 'to'>): Promise<PushResult[]>;
/**
 * Send to a topic
 */
export declare function sendToTopic(topic: string, message: Omit<FCMMessage, 'to' | 'topic'>): Promise<PushResult>;
/**
 * Subscribe tokens to a topic
 */
export declare function subscribeToTopic(tokens: string[], topic: string): Promise<boolean>;
/**
 * Unsubscribe tokens from a topic
 */
export declare function unsubscribeFromTopic(tokens: string[], topic: string): Promise<boolean>;
declare const __dtsx_default_export__: {
  send: typeof send;
  sendMulticast: typeof sendMulticast;
  sendToTopic: typeof sendToTopic;
  subscribeToTopic: typeof subscribeToTopic;
  unsubscribeFromTopic: typeof unsubscribeFromTopic;
  configure: typeof configure
};
export declare interface FCMMessage {
  to?: string
  topic?: string
  condition?: string
  notification?: {
    title: string
    body: string
    icon?: string
    image?: string
    sound?: string
    badge?: string
    clickAction?: string
    tag?: string
  }
  data?: Record<string, string>
  priority?: 'high' | 'normal'
  ttl?: number
  collapseKey?: string
}
export declare interface FCMConfig {
  projectId?: string
  serviceAccount?: {
    clientEmail: string
    privateKey: string
  }
}
export { send as Send };
export default __dtsx_default_export__;