/**
 * @deprecated Use `E2EE_PROTOCOL_VERSION` from `src/e2ee/protocol.ts`, which is
 * the canonical home. This name survives as a re-export of that one value
 * because `src/server.ts` and `pair-payload.ts` import it and another track is
 * editing `server.ts` — deleting the symbol would widen W1a's diff into files
 * it does not own. `__tests__/e2ee-protocol-version.test.ts` asserts the two
 * names are one value, which is what makes the alias safe rather than a second
 * hand-synced copy (NONCE-DESIGN §4).
 */
export declare const E2EE_EXCHANGE_VERSION = 1;
export declare class E2eeRequestError extends Error {
    /** Stable code for the client, so a version mismatch is not a parse failure. */
    readonly code: "E2EE_MALFORMED" | "E2EE_VERSION_UNSUPPORTED";
    constructor(code: E2eeRequestError["code"], message: string);
}
export interface E2eeExchangeRequest {
    version: number;
    /** Noise `IK` message 1, decoded. */
    message1: Buffer;
}
/**
 * `null` for a client that did not ask for encryption; a parsed request for one
 * that did; a throw for one that asked incoherently.
 *
 * The three are deliberately distinct. Collapsing "absent" into "malformed"
 * breaks every released client, and collapsing "malformed" into "absent" would
 * silently pair a client that believed it was encrypting — which is the
 * downgrade the whole negotiation exists to prevent, arrived at through a
 * parser rather than an attacker.
 */
export declare function parseE2eeRequest(raw: unknown): E2eeExchangeRequest | null;
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