/**
 * Model capabilities client.
 *
 * The model roster — internal model ids, friendly aliases, defaults, and each
 * model's parameter constraints (aspect ratios / resolutions / durations /
 * reference-image caps / Seedream size presets) — is owned by ab-api and served
 * from POST /model/capabilities (public, no auth). The CLI fetches it at runtime
 * instead of hardcoding it, so this npm package never ships the internal model
 * matrix or provider details, and validation can't drift from the backend.
 *
 * Fetched once per process and memoized; the catalog is static server-side.
 */
export interface ModelConstraints {
    aspectRatios?: string[];
    resolutions?: string[];
    durations?: number[];
    durationMin?: number;
    durationMax?: number;
    durationDefault?: number;
    refImageMax?: number;
    /** Omni-modal reference caps (Seedance 2.0): videos and audio clips per request. */
    refVideoMax?: number;
    refAudioMax?: number;
    sizes?: string[];
    /** aspect-ratio → [width, height] pixel preset (Seedream). Per model: the same
     *  ratio maps to different pixels on different Seedream variants. */
    sizePresets?: Record<string, [number, number]>;
    /** total-pixel bounds (width × height); the backend rescales sizes outside them. */
    pixelMin?: number;
    pixelMax?: number;
}
export interface ModelDescriptor {
    id: string;
    label: string;
    aliases?: string[];
    default?: boolean;
    constraints: ModelConstraints;
}
export interface VoiceCapabilities {
    provider: string;
    defaultVoiceId: string;
    speedMin: number;
    speedMax: number;
}
export interface DigitalHumanCapabilities {
    sources: string[];
    defaultVoiceId: string;
}
export interface ModelCapabilities {
    image: ModelDescriptor[];
    video: ModelDescriptor[];
    voice: VoiceCapabilities;
    digitalHuman: DigitalHumanCapabilities;
}
/** Fetch (and memoize) the model capabilities catalog from ab-api. */
export declare function getCapabilities(apiBaseUrl?: string): Promise<ModelCapabilities>;
/**
 * Resolve a user-supplied model (friendly alias or full id) against a model
 * list. Returns the matched descriptor, or null when nothing matches.
 */
export declare function matchModel(list: ModelDescriptor[], input: string): ModelDescriptor | null;
/** The descriptor flagged `default` in a list, falling back to the first entry. */
export declare function defaultModel(list: ModelDescriptor[]): ModelDescriptor | undefined;