/**
 * Aria attributes whose value is a space separated list of element ids.
 *
 * A component's `*AriaAttribute` union must only list attributes that the component composes
 * internally and merges via `mergeAriaIds`. Listing an attribute that is never read makes the
 * consumer value disappear silently, and `warnOnNativeAriaAttribute` does not catch that.
 * Attributes a component does not own already work natively via `...rest`.
 */
type AriaIdListAttribute = 'aria-describedby' | 'aria-labelledby';
/**
 * Merges multiple id list values into a single space separated list, for aria attributes
 * like `aria-describedby` and `aria-labelledby`.
 *
 * Accepts already space separated id lists as well as conditional expressions
 * (e.g. `invalid && systemFeedback && systemFeedbackId`).
 * Falsy values are ignored and duplicate ids are removed while keeping the original order,
 * so internally generated ids can be combined with consumer provided ids.
 *
 * @param values - The id list values to merge.
 * @returns The merged value, or `undefined` if no id remains so the attribute gets omitted.
 */
export declare const mergeAriaIds: (...values: (string | false | null | undefined)[]) => string | undefined;
/**
 * Warns when a native aria attribute is set on a component that owns that attribute
 * internally. Such attributes are inherited from the underlying HTML element, so they are
 * valid TypeScript but get dropped silently without this warning.
 *
 * Intended for development use only; should not be used in production environments.
 *
 * @param componentName - The name of the component the attribute was set on.
 * @param attribute - The name of the native aria attribute.
 * @param value - The value of the native aria attribute.
 */
export declare const warnOnNativeAriaAttribute: (componentName: string, attribute: AriaIdListAttribute, value: string | undefined) => void;
export {};