import { DictationMint } from './dictation-session';
/**
 * Session-token reuse: an ephemeral client secret can open multiple realtime
 * sessions until it expires (120s TTL), so re-minting on every activation
 * wastes a full backend round trip. The cache holds the latest mint and
 * hands it back while comfortably inside its TTL; hovering the mic
 * pre-warms it so the first click starts instantly too.
 *
 * One instance per widget (owned by DictationCtx), never module state — two
 * widgets on one page must not share a mint across orgs.
 */
export declare class DictationMintCache {
    private cached;
    private inflight;
    /** Valid cached mint, or null. */
    get(): DictationMint | null;
    /**
     * Resolve a mint, deduping concurrent requests (hover-prewarm racing a
     * click reuses the same in-flight promise instead of double-minting).
     */
    resolve(mintFresh: () => Promise<DictationMint>): Promise<DictationMint>;
    /** Drop the cache (e.g. after a failed handshake — token may be stale). */
    clear(): void;
}
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