export declare const isReducedMotion: boolean;
export declare function isMobileView(): boolean;
export declare function setFromParentSize(element: HTMLElement): void;
export declare function numberRange(start: number, end: number): number[];
export declare const JSONAttributeParser: (value: string | null) => {};
/**
 * Normalizes a string value that might be null, undefined, or the string "null"/"undefined".
 * This is useful for handling values from React/Next.js object spreads where null props
 * can be serialized as the string "null".
 *
 * @param value - The value to normalize
 * @returns An empty string if the value is null, undefined, or the string "null"/"undefined", otherwise the value
 *
 * @example
 * ```typescript
 * protected updated(changedProperties: Map<PropertyKey, unknown>): void {
 *   super.updated(changedProperties)
 *   if (changedProperties.has('title')) {
 *     this.title = normalizeStringProperty(this.title)
 *   }
 * }
 * ```
 */
export declare function normalizeStringProperty(value: string | null | undefined): string;
/**
 * Lit property converter that handles null/undefined values from React/Next.js object spreads.
 *
 * When React serializes null props (e.g., from object spreads like {...props} where props.title = null),
 * it can become the string "null" in HTML attributes. This converter normalizes these cases.
 *
 * @example
 * ```typescript
 * @property({
 *   converter: stringPropertyConverter
 * })
 * title: string
 * ```
 *
 * This prevents the string "null" from appearing in the rendered output when:
 * - Props come from object spreads with null values
 * - React/Next.js serializes null as the string "null"
 * - Properties are set directly (bypassing attribute conversion)
 *
 * Note: For direct property assignments (e.g., `element.title = null`), also use
 * `normalizeStringProperty` in the `updated` lifecycle method.
 */
export declare const stringPropertyConverter: {
    fromAttribute: (value: string | null) => string;
    toAttribute: (value: string | null | undefined) => string | null;
};
export declare function getValidityStateObject(state: Partial<ValidityState>): {
    badInput: boolean;
    customError: boolean;
    patternMismatch: boolean;
    rangeOverflow: boolean;
    rangeUnderflow: boolean;
    stepMismatch: boolean;
    tooLong: boolean;
    tooShort: boolean;
    typeMismatch: boolean;
    valid: boolean;
    valueMissing: boolean;
};
/**
 * Converts a string to kebab-case.
 *
 * @param str - The string to convert
 * @returns The kebab-cased string
 */
export declare function kebabCase(str: string): string;