/**
 * @class `TextCodec` provides **UTF-8–safe** conversions between `text`, `hex`, `binary`, and `Base64` representations using byte-level transformations.
 *
 * @example
 * TextCodec.utf8ToHex('ভাষা'); // 'e0 a6 ad e0 a6 be e0 a6 b7 e0 a6 be'
 * TextCodec.hexToUtf8('e0 a6 ad e0 a6 be'); // 'ভা'
 */
export declare class TextCodec {
    private constructor();
    /**
     * @static Validates whether a string represents a valid hexadecimal byte sequence.
     *
     * @param hex - Hex string, spaced or un-spaced (e.g. "ff 0a" or "ff0a")
     * @returns `true` if the input is valid hex byte string
     *
     * @example
     * TextCodec.isValidHex('ff 0a');
     */
    static isValidHex(hex: string): boolean;
    /**
     * @static Validates whether a string represents a valid binary byte sequence.
     *
     * @param binary - Binary string, spaced or un-spaced
     * @returns `true` if the input is valid binary byte string
     *
     * @example
     * TextCodec.isValidBinary('01000001');
     */
    static isValidBinary(binary: string): boolean;
    /**
     * @static Validates whether a string represents a valid Base64-encoded string.
     *
     * @param b64 - Base64 string to check
     * @returns `true` if the input is valid Base64-encoded string
     *
     * @example
     * TextCodec.isValidBase64('SGVsbG8=');
     */
    static isValidBase64(b64: string): boolean;
    /**
     * @static Converts UTF-8 text into hexadecimal byte representation.
     *
     * @param text - UTF-8 text to convert
     * @param spaced - Whether to separate bytes with spaces, defaults to `true`
     * @returns Hexadecimal byte string
     *
     * @example
     * TextCodec.utf8ToHex('Hi');
     */
    static utf8ToHex(text: string, spaced?: boolean): string;
    /**
     * @static Converts UTF-8 text into binary byte representation.
     *
     * @param text - UTF-8 text to convert
     * @param spaced - Whether to separate bytes with spaces, defaults to `true`
     * @returns Binary byte string
     *
     * @example
     * TextCodec.utf8ToBinary('A');
     */
    static utf8ToBinary(text: string, spaced?: boolean): string;
    /**
     * @static Converts hexadecimal byte string into UTF-8 text.
     *
     * @param hex - Hexadecimal byte string
     * @returns Decoded UTF-8 text
     *
     * @example
     * TextCodec.hexToUtf8('48 69');
     */
    static hexToUtf8(hex: string): string;
    /**
     * @static Converts binary byte string into UTF-8 text.
     *
     * @param binary - Binary byte string
     * @returns Decoded UTF-8 text
     *
     * @example
     * TextCodec.binaryToUtf8('01001000 01101001');
     */
    static binaryToUtf8(binary: string): string;
    /**
     * @static Converts hexadecimal byte string into binary byte string.
     *
     * @param hex - Hexadecimal byte string
     * @param spaced - Whether to separate bytes with spaces, defaults to `true`
     * @returns Binary byte string
     *
     * @example
     * TextCodec.hexToBinary('ff');
     */
    static hexToBinary(hex: string, spaced?: boolean): string;
    /**
     * @static Converts binary byte string into hexadecimal byte string.
     *
     * @param binary - Binary byte string
     * @param spaced - Whether to separate bytes with spaces, defaults to `true`
     * @returns Hexadecimal byte string
     *
     * @example
     * TextCodec.binaryToHex('00000001');
     */
    static binaryToHex(binary: string, spaced?: boolean): string;
    /**
     * @static Converts a Base64-encoded string into UTF-8 text.
     *
     * @param b64 - Base64 encoded string
     * @returns Decoded UTF-8 text
     *
     * @example
     * TextCodec.base64ToUtf8('SGVsbG8=');
     */
    static base64ToUtf8(b64: string): string;
    /**
     * @static Converts UTF-8 text into a Base64-encoded string.
     *
     * @param text - UTF-8 text to encode
     * @returns Base64 encoded string
     *
     * @example
     * TextCodec.utf8ToBase64('Hello');
     */
    static utf8ToBase64(text: string): string;
    /**
     * @static Converts Base64 directly into hexadecimal byte string.
     *
     * @param b64 - Base64 encoded string
     * @param spaced - Whether to separate bytes with spaces, defaults to `true`
     * @returns Hexadecimal byte string
     *
     * @example
     * TextCodec.base64ToHex('SGVsbG8=');
     */
    static base64ToHex(b64: string, spaced?: boolean): string;
    /**
     * @static Converts Base64 directly into binary byte string.
     *
     * @param b64 - Base64 encoded string
     * @param spaced - Whether to separate bytes with spaces, defaults to `true`
     * @returns Binary byte string
     *
     * @example
     * TextCodec.base64ToBinary('SGVsbG8=');
     */
    static base64ToBinary(b64: string, spaced?: boolean): string;
    /**
     * @static Converts hexadecimal byte string into a Base64 string.
     *
     * @param hex - Hexadecimal byte string
     * @returns Base64 encoded string
     *
     * @example
     * TextCodec.hexToBase64('48 69');
     */
    static hexToBase64(hex: string): string;
    /**
     * @static Converts binary byte string into a Base64 string.
     *
     * @param binary - Binary byte string
     * @returns Base64 encoded string
     *
     * @example
     * TextCodec.binaryToBase64('01001000 01101001');
     */
    static binaryToBase64(binary: string): string;
}