refactor: 'extra' field for future properties

packages/vow/src/tools.js

@@ -7,7 +7,7 @@ import { makeAsVow } from './vow-utils.js';
 
 /**
  * @import {Zone} from '@agoric/base-zone';
- * @import {IsRetryableReason, AsPromiseFunction, Vow, EVow} from './types.js';
+ * @import {IsRetryableReason, AsPromiseFunction, EVow} from './types.js';
  */
 
 /**

packages/vow/src/vow.js

@@ -9,6 +9,7 @@ const { details: X } = assert;
 /**
  * @import {PromiseKit} from '@endo/promise-kit';
  * @import {Zone} from '@agoric/base-zone';
+ * @import {MapStore} from '@agoric/store';
  * @import {VowResolver, VowKit} from './types.js';
  */
 
@@ -78,6 +79,12 @@ export const prepareVowKit = zone => {
         null
       ),
       isStoredValue: /** @type {boolean} */ (false),
+      /**
+       * Map for future properties that aren't in the schema.
+       * UNTIL https://github.com/Agoric/agoric-sdk/issues/7407
+       * @type {MapStore<any, any> | undefined}
+       */
+      extra: undefined,
     }),
     {
       vowV0: {

packages/vow/src/watch-utils.js

@@ -10,7 +10,7 @@ const { Fail, bare, details: X } = assert;
  * @import {Zone} from '@agoric/base-zone';
  * @import {Watch} from './watch.js';
  * @import {When} from './when.js';
- * @import {VowKit, AsPromiseFunction, IsRetryableReason, Vow, EVow} from './types.js';
+ * @import {VowKit, AsPromiseFunction, IsRetryableReason, EVow} from './types.js';
  */
 
 const VowShape = M.tagged(

packages/vow/test/watch-utils.test.js

@@ -247,6 +247,7 @@ test('asPromise handles watcher arguments', async t => {
     },
   };
 
+  // XXX fix type: `watcherContext` doesn't need to be an array
   const result = await asPromise(vow, watcher, ['ctx']);
   t.is(result, 'watcher test');
   t.true(watcherCalled);