/** Replace NUL and other non-printing control bytes with spaces (GRS-020a-fix
 *  finding 2). Shared by the FTS sanitizer and the search routes so hostile
 *  encoded input (%00 etc.) yields a normal result everywhere, never a 500. */
export declare function stripControlChars(value: string): string;
/** True if the string carries a NUL or other non-printing control byte. The
 *  REJECT-don't-strip gate for security-critical PATH params (GRS-020b-fix):
 *  {@link stripControlChars} would silently REPAIR a `%00`-tampered path into a
 *  valid one, so the knowledge read surface rejects on the raw param instead. */
export declare function hasControlBytes(value: string): boolean;
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