export declare function guessMimeTypeFromExtension(filename: string): string | undefined;
/**
 * Return a best-guess MIME type based on the magic-number signature
 * found at the start of an ArrayBuffer.
 *
 * @param buf – the source ArrayBuffer
 * @returns the detected MIME type, or `"application/octet-stream"` if unknown
 */
export declare function guessMimeTypeFromContents(buf: ArrayBuffer | string): string;
/**
 * Make a contentHash of a Blob that matches the File Storage metadata, allowing
 * identifying when content is identical.
 * By default, uses SHA-256 (which is what Convex File Storage tracks).
 * Git / GitHub use SHA-1.
 * @param blob The contents to hash
 * @returns hash of the contents
 */
export declare function contentHashFromArrayBuffer(buffer: ArrayBuffer, algorithm?: "SHA-256" | "SHA-1"): Promise<string>;
/**
 * Split a filename into a keyword-friendly string. Specifically adds sections
 * of camelCase and TitleCase into a space-separated strings.
 * e.g. "MyFile is soGreat.txt" -> "MyFile is soGreat.txt My File so Great"
 * Note: it doesn't split up titles that don't have a file extension.
 */
export declare function splitFilename(title: string | undefined): string | undefined;
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