Function maxWireVersion

src/utils.ts:332–370

(handshakeAware?: Connection | Topology | Server)

 * @internal
 */
export function maxWireVersion(handshakeAware?: Connection | Topology | Server): number {
  if (handshakeAware) {
    if (handshakeAware.hello) {
      return handshakeAware.hello.maxWireVersion;
    }

    if (handshakeAware.serverApi?.version) {
      // We return the max supported wire version for serverAPI.
      return MAX_SUPPORTED_WIRE_VERSION;
    }
    // This is the fallback case for load balanced mode. If we are building commands the
    // object being checked will be a connection, and we will have a hello response on
    // it. For other cases, such as retryable writes, the object will be a server or
    // topology, and there will be no hello response on those objects, so we return
    // the max wire version so we support retryability. Once we have a min supported
    // wire version of 9, then the needsRetryableWriteLabel() check can remove the
    // usage of passing the wire version into it.
    if (handshakeAware.loadBalanced) {
      return MAX_SUPPORTED_WIRE_VERSION;
    }

    if ('lastHello' in handshakeAware && typeof handshakeAware.lastHello === 'function') {
      const lastHello = handshakeAware.lastHello();
      if (lastHello) {
        return lastHello.maxWireVersion;
      }
    }

    if (
      handshakeAware.description &&
      'maxWireVersion' in handshakeAware.description &&
      handshakeAware.description.maxWireVersion != null
    ) {
      return handshakeAware.description.maxWireVersion;
    }
  }

  return 0;
}

/** @internal */
export function arrayStrictEqual(arr: unknown[], arr2: unknown[]): boolean {