/**
 * Redact PII from a log payload before it is sent to diagnostics.
 *
 * Redaction is key-aware:
 * - **Sensitive keys** (email, ssn, password, token, …) — entire value replaced.
 * - **Free-text keys** (`message`, `stack`, `description`) — inline PII regexes.
 * - **Base schema keys** and **`context`** — pass through unchanged.
 * - **All other keys** — pass through unchanged (structured fields such as `duration`).
 *
 * Returns the original reference when nothing changed (copy-on-write).
 * @param data Object to redact.
 * @returns Redacted object, or the same reference when no redaction was needed.
 */
export declare const redactPii: <T>(data: T) => T;