import type { AsrBackendId } from '../config.js';
import type { VoiceInputState } from './voice-flow.js';
export type VoiceToggleAction = 'start' | 'stop' | 'ignore';
export type MicrophoneClickDecision = {
    action: 'ignore';
} | {
    action: 'stop';
} | {
    action: 'unavailable';
} | {
    action: 'start';
    backend: AsrBackendId;
};
/** Map a stored backend ID to a recognized capture backend, or null if unknown. */
export declare function resolveCaptureBackend(value: string): AsrBackendId | null;
export declare function voiceToggleAction(state: VoiceInputState): VoiceToggleAction;
export declare function decideMicrophoneClick(options: {
    state: VoiceInputState;
    asrBackend: string;
    browserAvailable: {
        webSpeech: boolean;
        mediaRecorder: boolean;
    };
}): MicrophoneClickDecision;
/** Drop a MediaRecorder create() that finished after unmount or an explicit cancel. */
export declare function shouldAbandonPendingCapture(mounted: boolean, cancelled: boolean): boolean;
/** Reuse an asynchronous operation while the same keyed operation is in flight. */
export declare function reuseInFlightPromise<TKey, TResult>(inFlight: {
    current: {
        key: TKey;
        promise: Promise<TResult>;
    } | null;
}, key: TKey, operation: () => Promise<TResult>): Promise<TResult>;
/** Check whether a media capture was superseded by a newer start generation. */
export declare function isSupersededMediaCapture(latestGeneration: number, generation: number): boolean;
/**
 * Prefer the recognition session's own text. When the browser emits no final
 * result, recover the live draft slice written by interim updates.
 */
export declare function webSpeechCommittedTranscript(options: {
    sessionText: string;
    sessionDraft: string;
    baseDraft: string;
}): string;