/**
 * Returns the byte length of an already-serialized value (`string` or `Buffer`).
 * @internal
 */
export declare function serializedByteSize(body: string | Buffer): number;
/**
 * Estimates the serialized byte size of an arbitrary value.
 *
 * Falls back to `JSON.stringify` for objects. If that also fails, returns
 * `fallback` — callers choose `0` (conservative: don't reject) or
 * `Infinity` (conservative: assume large, offload to worker).
 *
 * @internal
 */
export declare function estimateByteSize(value: unknown, fallback?: number): number;
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