/**
 * Deep, stdout-safe formatting for HTTP request debug logs.
 * Avoids Node's shallow console serialization (`[Object]`) while applying
 * key-based and pattern-based PII / secret reduction before `util.inspect`.
 */
/**
 * Format a pre-redacted request log object (e.g. output of `redactSensitiveFields`)
 * for a single console line with full structural depth.
 */
export declare function formatRequestLogLine(level: "DEBUG" | "WARN" | "ERROR", event: string, payload: Record<string, unknown>): string;
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