/**
 * Format Detector for Virtual Filesystem
 * Detects data format from extension, content-type, or content inspection
 */
/**
 * Supported data formats
 */
export type DataFormat = 'csv' | 'json' | 'parquet' | 'arrow' | 'excel' | 'text' | 'binary' | 'unknown';
/**
 * DuckDB reader function for each format
 */
export interface FormatReader {
    format: DataFormat;
    readerFunction: string;
    requiresQuotes: boolean;
    supportsGlob: boolean;
}
/**
 * Detects data format from various sources
 */
export declare class FormatDetector {
    private static readonly EXTENSION_MAP;
    private static readonly CONTENT_TYPE_MAP;
    /**
     * Detect format from file extension
     * @param filename The filename or path
     * @returns Detected format or 'unknown'
     */
    static fromExtension(filename: string): DataFormat;
    /**
     * Detect format from MIME content-type
     * @param contentType The MIME content-type
     * @returns Detected format or 'unknown'
     */
    static fromContentType(contentType: string): DataFormat;
    /**
     * Detect format from content inspection (magic numbers)
     * @param content Buffer or first bytes of content
     * @returns Detected format or 'unknown'
     */
    static fromContent(content: Buffer | Uint8Array): DataFormat;
    /**
     * Detect format using all available information
     * @param options Detection options
     * @returns Detected format with confidence
     */
    static detect(options: {
        filename?: string;
        contentType?: string;
        content?: Buffer | Uint8Array;
    }): {
        format: DataFormat;
        confidence: number;
    };
    /**
     * Get DuckDB reader function for format
     * @param format The data format
     * @returns Reader function details
     */
    static getReader(format: DataFormat): FormatReader;
    /**
     * Build DuckDB query for reading a file
     * @param path The file path
     * @param format The data format
     * @returns SQL fragment for reading the file
     */
    static buildReadQuery(path: string, format: DataFormat): string;
    /**
     * Check if text looks like CSV
     */
    private static looksLikeCSV;
    /**
     * Check if text looks like JSON
     */
    private static looksLikeJSON;
    /**
     * Get MIME type for format
     * @param format The data format
     * @returns MIME content-type
     */
    static getMimeType(format: DataFormat): string;
    /**
     * Get file extension for format
     * @param format The data format
     * @returns Recommended file extension
     */
    static getExtension(format: DataFormat): string;
}
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