/**
 * Key Resolver
 * Resolves a clicked element to its translation key and ContentUnit.
 */
import type { ContentUnit } from '../../content/types.js';
export interface ResolvedKey {
    key: string;
    /** Source ContentUnit (original text with indexed tags) */
    unit: ContentUnit;
    /** Current translation as ContentUnit (if element is already translated) */
    translatedUnit: ContentUnit | null;
    element: Element;
}
/**
 * Resolve an element to its translation key.
 * Priority: data-lr-block attr → parseBlockElement → fallback textContent
 */
export declare function resolveKey(target: Element): ResolvedKey | null;
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