/**
 * Convert an `Error` (or any value with a `toJSON()` method) into a
 * plain object suitable for embedding in a JSON response body.
 *
 * Calls `input.toJSON()` if present — preserves every attribute the
 * error chose to surface (`code`, `cause`, `errors`, `issues`, `data`,
 * AuthupError sub-class fields, ...). Falls back to spreading the
 * Error's enumerable own properties alongside the standard
 * `name` / `message` pair, so caller-attached fields survive.
 *
 * Pair with `normalizeError` to handle arbitrary thrown values:
 * `serializeError(normalizeError(e))`.
 */
export declare function serializeError(input: Error): Record<string, any>;
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