import { type OnApplicationBootstrap, type OnApplicationShutdown } from '@nestjs/common';
import { DiscoveryService, MetadataScanner } from '@nestjs/core';
export declare class DiagnosticsExplorer implements OnApplicationBootstrap, OnApplicationShutdown {
    private readonly discovery;
    private readonly scanner;
    private readonly logger;
    private readonly subscriptions;
    private readonly wildcards;
    private offChannelRegistered;
    constructor(discovery: DiscoveryService, scanner: MetadataScanner);
    onApplicationBootstrap(): void;
    onApplicationShutdown(): void;
    /** Subscribe once to `name`; the listener fans the envelope into `invoke`. */
    private subscribe;
    /** Invoke a handler, swallowing sync throws and async rejections so a buggy
     *  reaction can never break the synchronous `emit()` that triggered it. */
    private safeInvoke;
    private logError;
}
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