import { SpeechEngine } from './types';
export interface HostedTtsOptions {
    /** Absolute or same-origin path of OUR proxy. Never the vendor directly. */
    endpoint: string;
    /** Extra headers per request (auth). Called fresh each time so a rotated token is picked up. */
    getHeaders?: () => Record<string, string>;
    fetchImpl?: typeof fetch;
    /** Test seam: the clock the disable window is measured against. */
    now?: () => number;
}
/**
 * The hosted engine, plus the one hook its owner needs beyond `SpeechEngine`.
 */
export interface HostedSpeechEngine extends SpeechEngine {
    /**
     * The configured header source may now yield different headers.
     *
     * Lifts a refusal (401/403) that was earned with DIFFERENT headers — a stale
     * or missing token that the host has since corrected — instead of keeping
     * hosted speech off for the rest of the window. A no-op otherwise.
     */
    headersChanged(): void;
}
export declare function createHostedTtsEngine(options: HostedTtsOptions): HostedSpeechEngine;
//# sourceMappingURL=hostedTtsSpeechEngine.d.ts.map