/**
 * Determines if a click event occurred on the backdrop (outside content area).
 * Handles both Shadow DOM and Light DOM (slotted) content.
 *
 * @param event - The mouse click event
 * @param shadowRoot - The shadow root containing the content
 * @param contentSelector - CSS selector for the content container (e.g., '.dialog-container')
 * @returns true if click was on backdrop, false if on content
 */
export declare function isBackdropClick(event: MouseEvent, shadowRoot: ShadowRoot | null, contentSelector: string): boolean;
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