import { SpeakerSettings } from './speech-model.js';
/** The part of a voice the utilities need (structural, so tests need no browser). */
export interface VoiceLike {
    voiceURI: string;
    name: string;
    lang: string;
    localService: boolean;
    default: boolean;
}
/**
 * Voices whose language matches the locale ("de" matches "de-DE", "de_AT",
 * "de"), local engines first, then the platform default, then by name —
 * the order an app can show in a picker as-is.
 */
export declare function filterVoicesByLocale<T extends VoiceLike>(voices: readonly T[], locale: string): T[];
/**
 * The voice to use: the configured one if it still exists, otherwise the
 * best voice for the locale, otherwise nothing (the engine picks by `lang`).
 */
export declare function pickVoice<T extends VoiceLike>(voices: readonly T[], locale: string, voiceURI?: string): T | undefined;
/**
 * Split text into chunks of at most `maxLength` characters, preferring
 * sentence ends, then commas/semicolons, then spaces. Chrome silently
 * stops utterances that run longer than roughly 15 seconds.
 */
export declare function splitIntoChunks(text: string, maxLength: number): string[];
/** Complete settings within the supported ranges (NaN/undefined → default). */
export declare function normalizeSpeakerSettings(settings?: Partial<SpeakerSettings>): SpeakerSettings;
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