import type { Definition } from 'roosterjs-editor-types';
/**
 * Get metadata object from an HTML element
 * @param element The HTML element to get metadata object from
 * @param definition The type definition of this metadata used for validate this metadata object.
 * If not specified, no validation will be performed and always return whatever we get from the element
 * @param defaultValue The default value to return if the retrieved object cannot pass the validation,
 * or there is no metadata object at all
 * @returns The strong-type metadata object if it can be validated, or null
 */
export declare function getMetadata<T>(element: HTMLElement, definition?: Definition<T>, defaultValue?: T): T | null;
/**
 * Set metadata object into an HTML element
 * @param element The HTML element to set metadata object to
 * @param metadata The metadata object to set
 * @param def An optional type definition object used for validate this metadata object.
 * If not specified, metadata will be set without validation
 * @returns True if metadata is set, otherwise false
 */
export declare function setMetadata<T>(element: HTMLElement, metadata: T, def?: Definition<T>): boolean;
/**
 * Remove metadata from the given element if any
 * @param element The element to remove metadata from
 * @param metadataKey The metadata key to remove, if none provided it will delete all metadata
 */
export declare function removeMetadata<T>(element: HTMLElement, metadataKey?: string): void;