import { NestInterceptor, ExecutionContext, CallHandler } from '@nestjs/common';
import { Observable } from 'rxjs';
/**
 * Interceptor for feature flag usage analytics.
 *
 * FLOW:
 * 1. Runs AFTER middleware attaches feature flags.
 * 2. Dynamically tracks which feature flags are enabled for this request.
 * 3. Can send metrics to analytics service or database.
 * 4. Calls the next handler (controller/service).
 * 5. After controller/service finishes, optionally track request completion.
 */
export declare class FeatureFlagLoggingInterceptor implements NestInterceptor {
    private readonly logger;
    intercept(context: ExecutionContext, next: CallHandler): Observable<unknown>;
    private trackFeatureUsage;
}
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