import type HTMLInputElement from './HTMLInputElement.js';
/**
 * HTML input element value stepping.
 */
export default class HTMLInputElementValueStepping {
    /**
     * Steps up or down.
     *
     * @param input Input element.
     * @param direction Direction.
     * @param [increment] Increment.
     * @returns New value.
     */
    static step(input: HTMLInputElement, direction: -1 | 1, increment?: number): string | null;
    /**
     * Returns the stepped value for "number" input field.
     *
     * @see https://html.spec.whatwg.org/multipage/input.html#dom-input-stepup
     * @param input Input element.
     * @param direction Direction.
     * @param [increment] Increment.
     */
    private static getNumberValue;
}
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