/**
 * Provides methods for returning common symbolic values and objects,
 * such as `null`, `undefined`, `whitespace`, `object`, `array`, and `date`.
 * These methods can be used in a variety of contexts where it is necessary
 * to represent these values or objects programmatically.
 *
 * @remarks
 * Invoked in mapping rules using `{@symbol.<method>}` syntax.
 * Symbol methods take no parameters; they are called directly
 * in the `@pipe` structure.
 */
declare class SymbolHandler {
    /**
     * Returns the value `null`, representing a deliberate non-value.
     *
     * @returns {null} The null value
     * @example
     * ```yaml
     * set_null:
     *   "@pipe":
     *     - ["{@symbol.null}"]
     * ```
     */
    null(): null;
    /**
     * Returns the value `undefined`, representing a variable
     * that has not been assigned a value.
     *
     * @returns {undefined} The undefined value
     * @example
     * ```yaml
     * set_undefined:
     *   "@pipe":
     *     - ["{@symbol.undefined}"]
     * ```
     */
    undefined(): undefined;
    /**
     * Returns a single whitespace character as a string.
     *
     * @returns {string} A single space character
     * @example
     * ```yaml
     * set_whitespace:
     *   "@pipe":
     *     - ["{@symbol.whitespace}"]
     * ```
     */
    whitespace(): string;
    /**
     * Returns an empty object (`{}`).
     *
     * @returns {object} An empty object
     * @example
     * ```yaml
     * set_object:
     *   "@pipe":
     *     - ["{@symbol.object}"]
     * ```
     */
    object(): object;
    /**
     * Returns an empty array (`[]`).
     *
     * @returns {any[]} An empty array
     * @example
     * ```yaml
     * set_array:
     *   "@pipe":
     *     - ["{@symbol.array}"]
     * ```
     */
    array(): any[];
    /**
     * Returns the positive infinity value (`Infinity`).
     *
     * @returns {number} Positive infinity
     * @example
     * ```yaml
     * set_pos_infinity:
     *   "@pipe":
     *     - ["{@symbol.posInfinity}"]
     * ```
     */
    posInfinity(): number;
    /**
     * Returns the negative infinity value (`-Infinity`).
     *
     * @returns {number} Negative infinity
     * @example
     * ```yaml
     * set_neg_infinity:
     *   "@pipe":
     *     - ["{@symbol.negInfinity}"]
     * ```
     */
    negInfinity(): number;
    /**
     * Returns the not-a-number value (`NaN`).
     *
     * @returns {number} NaN
     * @example
     * ```yaml
     * set_nan:
     *   "@pipe":
     *     - ["{@symbol.NaN}"]
     * ```
     */
    NaN(): number;
    /**
     * Returns the current date and time as a Date object.
     *
     * @returns {Date} The current date and time
     * @example
     * ```yaml
     * set_date:
     *   "@pipe":
     *     - ["{@symbol.date}"]
     *     - ["{@json.stringify}"]
     * ```
     */
    date(): Date;
}
export { SymbolHandler };