/**
 * Client-side validation for {@link setFormFont} arguments. Mirrors the
 * Java FormFontValidator and .NET FormFontValidator added for PDF-2184.
 *
 * The engine validates again on receipt — this client check is the
 * fail-fast layer that surfaces obvious mistakes before any network I/O.
 */
/// <reference types="node" />
/// <reference types="node" />
/**
 * Validate a PDF font name. Allowed characters: letters, digits, '_', '-',
 * '.', '+'. The '+' is permitted to accept subset prefixes like
 * "AAAAAA+Poppins-Regular". Names must be 1-63 characters.
 *
 * @throws Error when the name fails validation.
 */
export declare function validateFormFontName(fontName: string): void;
/**
 * Validate raw font bytes look like a TrueType / OpenType / TTC sfnt
 * container. Catches the obvious cases: empty payload, oversize payload,
 * ASCII text passed instead of bytes, and all-zero payloads.
 *
 * @throws Error when the data fails validation.
 */
export declare function validateFormFontData(fontData: Buffer): void;
//# sourceMappingURL=formFontValidator.d.ts.map