import type { ApnsPort, ApnsPush, ApnsResult } from './port';
/**
 * The real thing: HTTP/2 to Apple, with a token-based authentication header.
 *
 * Three details carry most of the ways this goes wrong.
 *
 * **The topic is the pass type identifier**, not an application's bundle id.
 * Getting it wrong produces `TopicDisallowed` on every push and no other
 * symptom.
 *
 * **The payload is empty.** A pass update carries `{}`; anything else is
 * ignored at best.
 *
 * **The authentication token is cached.** Apple refuses a provider token
 * regenerated more often than once every twenty minutes — `TooManyProviderTokenUpdates`
 * — and expires one older than an hour. Minting per request fails both ways at
 * once, which is why this holds one and refreshes it well inside the window.
 */
export interface Http2ApnsOptions {
    /** The `.p8` signing key from the Apple Developer account, as PEM. */
    privateKey: string;
    /** The key's ten-character identifier. */
    keyId: string;
    /** The ten-character team identifier. */
    teamId: string;
    /** `production` talks to api.push.apple.com; `sandbox` to the other one. */
    environment?: 'production' | 'sandbox';
    /** Injected so a test can hold the clock still. */
    now?: () => Date;
}
export declare class Http2Apns implements ApnsPort {
    private readonly options;
    private session;
    private token;
    constructor(options: Http2ApnsOptions);
    send(pushes: readonly ApnsPush[]): Promise<ApnsResult[]>;
    /** Closes the connection. A worker that has finished should not hold one open. */
    close(): void;
    private connect;
    private authenticationToken;
    private one;
}
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