import type { Mode } from 'node:fs';
/**
 * We can detect file types for these files using the magic
 * number
 */
export declare const supportMagicFileTypes: ReadonlySet<string>;
/**
 * Detects the file type, extension, and MIME type/subtype by analyzing
 * the file's magic number (binary signature).
 *
 * @param fileContents - Buffer containing the file contents to analyze
 *
 * @example
 * ```ts
 * const buffer = await fs.readFile('image.png')
 * const fileType = await getFileType(buffer)
 * // { ext: 'png', type: 'image', subtype: 'png' }
 * ```
 */
export declare function getFileType(fileContents: Buffer): Promise<null | {
    ext: string;
    type?: string;
    subtype?: string;
}>;
/**
 * Computes the file extension and MIME type from the filename and headers
 * when magic number detection is not available or applicable.
 *
 * @param clientName - The original filename provided by the client
 * @param headers - Headers object containing the content-type
 *
 * @example
 * ```ts
 * const fileType = computeFileTypeFromName('document.pdf', {
 *   'content-type': 'application/pdf'
 * })
 * // { ext: 'pdf', type: 'application', subtype: 'pdf' }
 * ```
 */
export declare function computeFileTypeFromName(clientName: string, headers: {
    [key: string]: string;
}): {
    ext: string;
    type?: string;
    subtype?: string;
};
/**
 * Checks if a file or directory exists at the specified path.
 *
 * @param filePath - The path to check for existence
 *
 * @example
 * ```ts
 * if (await pathExists('/tmp/upload.jpg')) {
 *   console.log('File exists')
 * }
 * ```
 */
export declare function pathExists(filePath: string): Promise<boolean>;
/**
 * Moves a file from source to destination, automatically handling cross-device
 * moves by falling back to copy+delete. Creates the destination directory if
 * it doesn't exist.
 *
 * @param sourcePath - The current path of the file
 * @param destinationPath - The target path for the file
 * @param options - Move options including overwrite flag and directory permissions
 *
 * @example
 * ```ts
 * await moveFile('/tmp/upload.jpg', '/app/public/images/photo.jpg', {
 *   overwrite: true
 * })
 * ```
 */
export declare function moveFile(sourcePath: string, destinationPath: string, options?: {
    overwrite: boolean;
    directoryMode?: Mode;
}): Promise<void>;
/**
 * Collection of normalizer functions for processing form body values.
 * These functions can trim whitespace and/or convert empty strings to null.
 */
export declare const formBodyNormalizers: {
    /**
     * Trims leading and trailing whitespace from a string value.
     *
     * @param value - The string to trim
     */
    trimWhitespaces(value: string): string;
    /**
     * Trims whitespace and converts empty strings to null.
     *
     * @param value - The string to process
     */
    trimWhitespacesAndConvertToNull(value: string): string | null;
    /**
     * Converts empty strings to null without trimming.
     *
     * @param value - The string to process
     */
    convertToNull(value: string): string | null;
};