/**
 * A decorator factory that assigns a specific HTML tag name to a class and configures its metadata for element parsing.
 *
 * This function returns a decorator function that, when applied to a class, sets a static `TAG` property on the class
 * to the provided `tag` argument. It also ensures that the class has metadata related to element parsing. If no parser
 * metadata is present, it initializes an empty parser array in the metadata.
 *
 * @param tag The HTML tag name to be associated with the target class.
 * @returns A class decorator that sets the `TAG` property and configures element parsing metadata on the target class.
 *
 * ### Example
 * ```typescript
 * @ElementDef('custom-element')
 * class MyCustomElement {
 * // class body
 * }
 * console.log(MyCustomElement.TAG); // Outputs: 'custom-element'
 * ```
 */
export declare function ElementDef(tag: string): (target: any) => void;