/**
 * Strict absence classifier for fail-closed filesystem boundaries.
 *
 * Every value in the inspected cause chain must carry the runtime's native
 * Error brand. This keeps arbitrary error-shaped records such as
 * `{ code: "ENOENT" }` from being converted into ordinary absence while still
 * recognizing native Deno, Node, and Veryfront not-found errors without
 * invoking project-owned hooks.
 */
export declare function isCanonicalNotFoundError(error: unknown): boolean;
export declare function isNotFoundError(error: unknown, seen?: Set<unknown>): boolean;
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