/**
 * Sign an ES256 JWT for APNs token-based authentication using only Node's
 * `node:crypto` stdlib — no third-party crypto dependency.
 *
 * Header: `{ alg: 'ES256', kid: <keyId>, typ: 'JWT' }`
 * Claims: `{ iss: <teamId>, iat: <now-seconds> }`
 *   (No `exp` — APNs validates the JWT against its own ~60-minute tolerance.)
 *
 * `dsaEncoding: 'ieee-p1363'` is critical: Node's default `'der'` produces an
 * ASN.1 `SEQUENCE(INTEGER r, INTEGER s)` signature, which APNs (and the
 * JWT ES256 spec) reject. IEEE P1363 raw `r||s` is required.
 *
 * The wrapper holds no state, so this is a pure function: no cache
 * parameters, no instance state.
 * Consumer-facing memoization lives in `ApnsConfig.tokenCache` and is wired
 * through the connector itself.
 */
export declare function createApnsJwt(keyId: string, teamId: string, privateKey: string): string;