/**
 * @function fileCache
 *
 * Sends a stringified file as a response with caching, security headers, and optional metadata.
 * If `data.file` is not a string, the request is passed to the next middleware.
 *
 * @param {import('express').Response} res - Express response object.
 * @param {import('express').NextFunction} next - Express next middleware function.
 * @param {object} data - Configuration object for the file response.
 * @param {string} [data.file] - The content of the file to send (must be a string).
 * @param {number} [data.fileMaxAge] - Max age in seconds for cache expiration.
 * @param {string} [data.date] - A date string used for the `Last-Modified` header.
 * @param {string} [data.timezone="Universal"] - Timezone for `moment.tz()`.
 * @param {string} [data.contentType="application/javascript"] - MIME type for the response.
 *
 * @example
 * import fileCache from './fileCache.mjs';
 *
 * app.get('/my-script.js', (req, res, next) => {
 *   const content = fs.readFileSync('./public/my-script.js', 'utf8');
 *   fileCache(res, next, {
 *     file: content,
 *     fileMaxAge: 3600,
 *     date: fs.statSync('./public/my-script.js').mtime,
 *     contentType: 'application/javascript'
 *   });
 * });
 */
export default function fileCache(res: import("express").Response, next: import("express").NextFunction, data: {
    file?: string | undefined;
    fileMaxAge?: number | undefined;
    date?: string | undefined;
    timezone?: string | undefined;
    contentType?: string | undefined;
}): void;
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