/**
 * What the image sits on. `transparent` asks for an alpha channel, which only
 * some providers can deliver — see
 * `ProviderRegistration.supportsTransparentBackground`.
 */
export type Background = "auto" | "transparent" | "opaque";
export interface GenerateParams {
    prompt: string;
    modelId: string;
    resolution: "1K" | "2K" | "4K";
    aspectRatio: string;
    mode: "image" | "image_and_text";
    thinking: "none" | "auto";
    background: Background;
    inputImages?: Buffer[];
    inputImageMimeTypes?: string[];
}
export interface GenerateResult {
    images: Buffer[];
    mimeType: string;
    description?: string;
}
export type ProviderFn = (params: GenerateParams) => Promise<GenerateResult>;
export interface ProviderRegistration {
    models: Record<string, string>;
    generate: ProviderFn;
    /**
     * How many input images the provider accepts. Callers use this to reject an
     * oversized request before reading any of the files off disk; omit it when
     * the provider has no documented limit.
     */
    maxInputImages?: number;
    /**
     * Whether the provider can return an image with an alpha channel
     * (`background: "transparent"`). Callers reject a transparent request aimed
     * at a provider without it instead of letting the request through and
     * handing back a silently opaque image; omit it when the provider cannot.
     */
    supportsTransparentBackground?: boolean;
}
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