import type { Application, Request } from 'express';
import type { ServerConfigV2 } from './types.js';
export declare function resolveEnvSecretReference(value: string): {
    ok: true;
    value: string;
} | {
    ok: false;
    missing: string;
};
export declare function extractApiKeyFromRequest(req: Request): string;
export declare function registerApiKeyAuthMiddleware(app: Application, config: ServerConfigV2): void;
export declare function registerDefaultMiddleware(app: Application, config?: ServerConfigV2): void;