/**
 * Extracts the session ID (`sid` claim) from a JWT token string.
 *
 * Decodes the base64url-encoded payload segment of the token and reads the
 * `sid` field. This is used to correlate instrumentation events with the
 * authenticated session, without ever forwarding the full token.
 *
 * Returns `null` when no token is present, when the token is malformed, or
 * when the payload does not contain a `sid` claim.
  * @notInstrumented
 */
export declare const extractSessionId: (token: string) => string | null;
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