export declare const SUPPORTED_IMAGE_MIME_TYPES: Set<string>;
export type ImageMetadata = {
    mimeType: "image/png";
    width?: number;
    height?: number;
    channels?: number;
    hasAlpha?: boolean;
} | {
    mimeType: "image/jpeg";
    width?: number;
    height?: number;
    channels?: number;
    hasAlpha?: false;
} | {
    mimeType: "image/gif";
    width?: number;
    height?: number;
    channels?: 3;
    hasAlpha?: never;
} | {
    mimeType: "image/webp";
    width?: number;
    height?: number;
    channels?: number;
    hasAlpha?: boolean;
};
export declare function parseImageMetadata(header: Uint8Array): ImageMetadata | null;
export declare function readImageMetadataSync(filePath: string, maxBytes?: number): ImageMetadata | null;
export declare function readImageMetadata(filePath: string, maxBytes?: number): Promise<ImageMetadata | null>;