/**
 * @internal
 */
export declare namespace InternalAttributeUtils {
    /**
     * Checks if the given value is considered "falsey" in the context of HTML attributes.
     * A value is considered falsey if it is "0" or "false" (case-insensitive).
     *
     * @param value - The attribute value to check.
     * @returns True if the value is falsey, otherwise false.
     */
    function isFalsey(value: string | null): boolean;
    /**
     * Retrieves the value of the specified attribute from the given element.
     * If the attribute value is considered falsey, it returns null.
     * @returns The attribute value or null if falsey.
     */
    function getAttributeValueIfNotFalsey(element: Element, attributeName: string, opts?: {
        onAttribute: (value: string) => void;
    }): string | null;
    /**
     * Retrieves the value of the specified attribute from the given element.
     * If the attribute value is considered falsey, it returns false.
     * If the attribute is not set at all, it returns null.
     * @returns The attribute value, false if falsey, or null if not set.
     *
     * @example
     * ```typescript
     * const result = HTMLAttributeUtils.getAttributeAndCheckFalsey(element, 'data-example', {
     *     onAttribute: (value, falsey) => {
     *         console.log(`Attribute value: ${value}
     * , Is falsey: ${falsey}`);
     *     }
     * });
     *
     * if (result === false) {
     *     console.log('The attribute is set to a falsey value.');
     * } else if (result === null) {
     *     console.log('The attribute is not set.');
     * } else {
     *     console.log(`The attribute value is: ${result}`);
     * }
     * ```
     */
    function getAttributeAndCheckFalsey(element: Element, attributeName: string, opts?: {
        onAttribute: (value: string, falsey: boolean) => void;
    }): false | string | null;
}