/**
 * Detection-time text normalization — an anti-evasion pass applied *before*
 * pattern matching so that obfuscated injections (homoglyphs, zero-width
 * characters, leetspeak, spaced-out letters, typos) are matched against the
 * same regexes as their plain-text equivalents.
 *
 * Kept as a pure, dependency-free function so it can preprocess input for any
 * guardrail.
 */
interface DetectNormalizationOptions {
    enabled?: boolean;
    /** Fold full-width and look-alike (Cyrillic/Greek) letters to ASCII. */
    foldHomoglyphs?: boolean;
    /** Remove zero-width and other invisible characters. */
    stripInvisible?: boolean;
    collapseWhitespace?: boolean;
    /** Join single letters separated by whitespace, e.g. `i g n o r e`. */
    joinSeparatedLetters?: boolean;
    normalizeCase?: boolean;
    /** Decode common leetspeak substitutions, e.g. `1gn0r3`. */
    decodeLeetspeak?: boolean;
    repairTypos?: boolean;
    repairPhonetics?: boolean;
}
type ResolvedDetectNormalizationOptions = Required<DetectNormalizationOptions>;
declare const DEFAULT_DETECT_NORMALIZATION: ResolvedDetectNormalizationOptions;
/** Resolve a normalization option (`true`/`undefined`/object) to a full config. */
declare function resolveDetectNormalization(options?: boolean | DetectNormalizationOptions): ResolvedDetectNormalizationOptions;
/**
 * Normalize text for detection. Defeats common evasion tricks before any
 * regex/keyword matching runs. Returns the (trimmed) input unchanged when
 * disabled.
 *
 * @example
 * normalizeForDetection('1gn0re prev10us 1nstruct10ns');
 * // => 'ignore previous instructions'
 */
declare function normalizeForDetection(input: string, options?: boolean | DetectNormalizationOptions): string;

export { type DetectNormalizationOptions as D, type ResolvedDetectNormalizationOptions as R, DEFAULT_DETECT_NORMALIZATION as a, normalizeForDetection as n, resolveDetectNormalization as r };