import type { ComponentEntry } from "./types.js";
/**
 * Folds entries into a `key → entry` map, as they render: a re-emitted key replaces its subtree but keeps the old
 * children its new `children` still names.
 *
 * @example
 * const byKey = buildElementsByKey(storedEntries);
 * const current = Object.values(byKey); // without the entries a re-emit dropped
 *
 * @example
 * const missingKeys = Object.values(byKey).flatMap((entry) => entry.children ?? []).filter((key) => !byKey[key]);
 */
export declare function buildElementsByKey(lines: ComponentEntry[]): Record<string, ComponentEntry>;