/**
 * Detect MIME type from a filename using its extension.
 * Falls back to `application/octet-stream` for unknown extensions.
 */
export declare function detectMimeType(filename: string): string;
/**
 * Select the appropriate chunker strategy for a given MIME type.
 */
export declare function selectChunker(mimeType: string): "text" | "pdf" | "video" | "audio" | "none";
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