export declare const SPARK_ATTACHMENT_UNSUPPORTED_MESSAGE = "Only JPG, PNG, WEBP, GIF, HEIC/HEIF, PDF, TXT, Markdown, or LaTeX files are supported.";
export declare const SPARK_ATTACHMENT_FILE_INPUT_ACCEPT: string;
export declare function resolveSparkAttachmentExtension(name: string): string;
export declare function normalizeSparkAttachmentMimeType(contentType: string | null | undefined): string | undefined;
export declare function resolveSparkAttachmentMimeTypeFromFilename(filename: string | null | undefined): string | undefined;
export declare function resolveSparkAttachmentExtensionForContentType(contentType: string | null | undefined): string | undefined;
export declare function isSparkImageAttachmentMimeType(contentType: string | null | undefined): boolean;
export declare function isSparkPdfAttachmentMimeType(contentType: string | null | undefined): boolean;
export declare function isSparkDocumentAttachmentMimeType(contentType: string | null | undefined): boolean;
export declare function isSparkSupportedAttachmentMimeType(contentType: string | null | undefined): boolean;
export declare function resolveSparkAttachmentMimeType(options: {
    filename?: string | null | undefined;
    claimedContentType?: string | null | undefined;
}): string | undefined;
export declare function isSparkSupportedClientFile(file: Pick<File, 'name' | 'type'>): boolean;
export declare function resolveSparkAttachmentBadge(options: {
    filename?: string | null | undefined;
    contentType?: string | null | undefined;
}): string;