import type { Store } from "./types.js";
export interface GcStats {
    total: number;
    reachable: number;
    collected: number;
    scanned: number;
}
/**
 * Garbage collection: mark-and-sweep algorithm
 * - Roots: all variable values (global, not scoped), excluding
 *   `@ocas/template/text/*` variables — those are added in a follow-up
 *   phase only when their referenced schema is itself reachable.
 * - Mark: recursively walk refs from roots
 * - Template phase: for every reachable schema, walk the contents of its
 *   `@ocas/template/text/<schema>` template variable (mirrors
 *   `computeClosure` Phase 3).
 * - Sweep: delete unmarked nodes
 * - Schema preservation: schemas of reachable nodes are also marked
 */
export declare function gc(store: Store): GcStats;
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