bol].dispatch(JSONStringify(message));
  }

  /**
   * Immediately closes the session, all pending
   * message callbacks will be called with an
   * error.
   * @returns {void}
   */
  disconnect() {
    if (!this[connectionSymbol])
      return;
    this[connectionSymbol].disconnect();
    this[connectionSymbol] = null;
    const remainingCallbacks = this[messageCallbacksSymbol].values();
    for (const callback of remainingCallbacks) {
      process.nextTick(callback, new ERR_INSPECTOR_CLOSED());
    }
    this[messageCallbacksSymbol].clear();
    this[nextIdSymbol] = 1;
  }
}

/**
 * Activates inspector on host and port.
 * @param {number} [port]
 * @param {string} [host]
 * @param {boolean} [wait]
 * @returns {void}
 */
function inspectorOpen(port, host, wait) {
  if (isEnabled()) {
    throw new ERR_INSPECTOR_ALREADY_ACTIVATED();
  }
  open(port, host);
  if (wait)
    waitForDebugger();
}

/**
 * Blocks until a client (existing or connected later)
 * has sent the `Runtime.runIfWaitingForDebugger`
 * command.
 * @returns {void}
 */
function inspectorWaitForDebugger() {
  if (!waitForDebugger())
    throw new ERR_INSPECTOR_NOT_ACTIVE();
}

module.exports = {
  open: inspectorOpen,
  close: process._debugEnd,
  url,
  waitForDebugger: inspectorWaitForDebugger,
  // This is dynamically added during bootstrap,
  // where the console from the VM is still available
  console: require('internal/util/inspector').consoleFromVM,
  Session
};