chore: typescript magic

attempt to address error

  Declaration emit for this file requires using private name
  'StartFunction' from module
  '"/Users/chris/agoric-sdk/packages/zoe/src/zoeService/utils"'. An
  explicit type annotation may unblock declaration emit

packages/inter-protocol/src/proposals/upgrade-vaults.js

@@ -56,6 +56,11 @@ export const upgradeVaults = async (powers, { options }) => {
 
   const bundleID = vaultsRef.bundleID;
   console.log(`upgradeVaults: bundleId`, bundleID);
+  /**
+   * @type {Promise<
+   *   Installation<import('../../src/vaultFactory/vaultFactory.js')['start']>
+   * >}
+   */
   let installationP;
   await null;
   if (vaultsRef) {