import type { PreviewKind } from './types';
/**
 * Extract the lower-cased extension (no leading dot) from a URL or filename.
 *
 * Strips query strings and fragments. Returns empty string if there is no
 * extension.
 */
export declare function extractExtension(input: string): string;
export declare function extractFilename(url: string, override?: string): string;
/**
 * Resolve a `PreviewKind` for a given URL / filename / Content-Type.
 *
 * Resolution order:
 *   1. Content-Type, if provided and matched
 *   2. File extension, if known
 *   3. `'unsupported'`
 */
export declare function detectKind(urlOrFilename: string, contentType?: string | null): PreviewKind;
/**
 * Human-readable label for a kind, used in the header type badge.
 */
export declare function kindLabel(kind: PreviewKind, extension?: string): string;
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