import type { RequestHandler } from 'express';
/** True once dependencies have connected (and remain connected). */
export declare function isReady(): boolean;
/** Set by the startup supervisor (and tests). */
export declare function setReady(ready: boolean): void;
/**
 * Default infra endpoints that must stay reachable while NotReady, so
 * orchestrators can probe liveness/readiness, scrape metrics, warm pools,
 * serve docs, and relay SSE logs during startup or a dependency outage. This
 * matches what `createApp` mounts. A service whose own routes COLLIDE with one
 * of these prefixes (e.g. platform serves a tenant log API at `/logs`) must
 * pass a narrower list to `readinessGuard()` so its business routes stay gated.
 */
export declare const DEFAULT_READINESS_BYPASS: string[];
/**
 * Readiness guard — while the service is NotReady (dependencies not yet
 * connected, or dropped), reject business requests with 503 + Retry-After
 * instead of letting them hit a disconnected datastore and 500.
 *
 * This is the portable, app-level readiness mechanism that works on every
 * deploy target — including Docker Compose (single replica, no orchestrator
 * traffic-draining) and Fargate (ECS exposes only one per-service health
 * signal, which is also a kill trigger). k8s readiness probes layer on top.
 *
 * @param bypassPaths Infra prefixes that always pass through even while
 *   NotReady. Defaults to {@link DEFAULT_READINESS_BYPASS}; pass a custom list
 *   when a business route would otherwise collide with a default prefix.
 */
export declare function readinessGuard(bypassPaths?: readonly string[]): RequestHandler;