/**
 * Platform-neutral pieces of the transport seam.
 *
 * Lives in its own module so both the Node `transport.ts` factory and the
 * browser `transport.browser.ts` stub can re-export the same symbols
 * without a re-export cycle through `package.json.browser`'s
 * `transport.js → transport.browser.js` remap.
 *
 * Today this file holds `validateCloseReason` + the RFC 6455 byte cap.
 * Any future platform-neutral transport helper (header-shape validation,
 * scheme normalization, etc.) belongs here for the same reason.
 */
/**
 * RFC 6455 §5.5.1: the close-frame application body — the `reason` string
 * after the 2-byte status code — must be ≤ 123 bytes when UTF-8 encoded.
 * `ws` (and any spec-compliant peer) crashes when handed a longer value.
 */
export declare const CLOSE_FRAME_REASON_MAX_BYTES = 123;
/**
 * Validate that a WS close-frame reason fits in the RFC 6455 cap.
 *
 * Used internally by the default Node factory's `close()` wrapper, and
 * exported so custom-transport authors can reach for the same typed-error
 * behavior before forwarding a reason into their own underlying socket.
 * `undefined` is a no-op (the factory closes without a reason).
 *
 * Throws `QodoTransportError` on overflow.
 */
export declare function validateCloseReason(reason: string | undefined): void;
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