/**
 * Shared absence vocabulary. Verified absence (the thing looked for is
 * known not to exist) is a different outcome from failure-to-determine;
 * consumers that branch on absence probe structurally with
 * {@link isAbsence} instead of sniffing per-class spellings or message
 * text.
 */
/**
 * Discriminant literal for verified absence. Error classes spell absence
 * as errorType "not_found"; wire codes derive from it via the
 * PREFIX_${errorType.toUpperCase()} minting convention.
 */
export declare const NOT_FOUND = "not_found";
/**
 * Structural absence probe: errorType "not_found" (typed service errors)
 * or statusCode 404 (API-boundary errors). Structural rather than
 * instanceof — class names are presentation, not contract (dist
 * minification has mangled them before), and the probe must hold across
 * the cli/deploy-core package boundary.
 */
export declare function isAbsence(err: unknown): boolean;