/**
 * Client-side PDF validation utilities.
 *
 * Provides quick checks (magic bytes, MIME type, file size) before
 * handing a file to the viewer or pdf.js fallback. These run entirely
 * in the browser — no server round-trip required.
 *
 * @public
 */
/** Result of a PDF validation check. */
export interface PdfValidationResult {
    /** Whether the file passed all checks. */
    valid: boolean;
    /** Human-readable error message when `valid` is false. */
    error?: string;
}
/**
 * Validate a `File` object before loading it into the viewer.
 *
 * Checks (in order):
 * 1. MIME type is `application/pdf` (or empty — some browsers don't
 *    populate it for drag-dropped files).
 * 2. First 5 bytes match the PDF magic signature `%PDF-`.
 * 3. File size is within the allowed limit.
 *
 * @param file - The `File` to validate.
 * @param maxBytes - Maximum allowed size in bytes. Default: 50 MB.
 * @returns A promise resolving to the validation result.
 *
 * @public
 */
export declare function validatePdfFile(file: File, maxBytes?: number): Promise<PdfValidationResult>;
/**
 * Validate a PDF URL string before loading it into the viewer.
 *
 * This is a **synchronous** surface-level check — it validates URL
 * format only. It does not fetch the URL or inspect response headers.
 *
 * @param url - The URL string to validate.
 * @returns The validation result.
 *
 * @public
 */
export declare function validatePdfUrl(url: string): PdfValidationResult;
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