type ObfuscatorVersion = "v1" | "v2" | "v3" | "v4";
interface ObfuscatorOptions {
    version?: ObfuscatorVersion;
    key?: string;
}
declare class Obfuscator {
    private readonly _v4Prefix;
    private readonly _base64UrlAlphabet;
    private readonly _randomKey;
    /**
     * Preferred obfuscation API. Defaults to V4.
     */
    encode(inputStr: string, options?: ObfuscatorOptions): string;
    /**
     * Preferred deobfuscation API. V4 payloads are self-identifying.
     */
    decode(inputStr: string, options?: ObfuscatorOptions): string;
    private _buildKeyValue;
    /**
     * V1 obfuscation - key-based character code encoding.
     * If no key is provided, a random key is generated and you cannot deobfuscate.
     * @param inputStr String to obfuscate.
     * @param key Optional key for reversibility.
     */
    obfuscate(inputStr: string, key?: string): string;
    /**
     * V1 deobfuscation.
     * @param inputStr String to deobfuscate.
     * @param key Key used during obfuscation.
     */
    deobfuscate(inputStr: string, key: string): string;
    private _swapPairs;
    /**
     * V2 obfuscation - pair-swapping with incremental key shifting.
     */
    obfuscatev2(inputStr: string): string;
    /**
     * V2 deobfuscation.
     */
    deobfuscatev2(inputStr: string): string;
    /**
     * V3 obfuscation - binary rotation with hex encoding.
     * @param inputStr String to obfuscate.
     * @param key Key used to determine rotation amounts.
     */
    obfuscatev3(inputStr: string, key: string): string;
    /**
     * V3 deobfuscation.
     */
    deobfuscatev3(inputStr: string, key: string): string;
    /**
     * V4 obfuscation - salted keyed byte-stream masking with base64url output.
     * This is reversible obfuscation, not cryptographic encryption.
     */
    obfuscatev4(inputStr: string, key: string): string;
    /**
     * V4 deobfuscation.
     */
    deobfuscatev4(inputStr: string, key: string): string;
    private _applyV4;
    private _seedFromKey;
    private _xorshift32;
    private _rotateLeftByte;
    private _rotateRightByte;
    private _randomSalt;
    private _base64UrlEncode;
    private _base64UrlDecode;
    private _base64UrlValue;
    private _requireKey;
    private _keyToValues;
}
declare const obfuscator: Obfuscator;

export { Obfuscator, type ObfuscatorOptions, type ObfuscatorVersion, obfuscator };