refactor(ertp): review suggestions

packages/ERTP/src/paymentLedger.js

@@ -3,7 +3,6 @@
 /* eslint-disable no-use-before-define */
 import { isPromise } from '@endo/promise-kit';
 import { mustMatch, M, keyEQ } from '@agoric/store';
-import { provide } from '@agoric/vat-data';
 import { AmountMath } from './amountMath.js';
 import { preparePaymentKind } from './payment.js';
 import { preparePurseKind } from './purse.js';
@@ -70,7 +69,7 @@ const amountShapeFromElementShape = (brand, assetKind, elementShape) => {
  * payments. All minting and transfer authority originates here.
  *
  * @template {AssetKind} K
- * @param {import('@agoric/zone').Zone} issuerZone
+ * @param {Zone} issuerZone
  * @param {string} name
  * @param {K} assetKind
  * @param {DisplayInfo<K>} displayInfo
@@ -374,28 +373,21 @@ export const preparePaymentLedger = (
     },
   });
 
-  /**
-   * @template {any} V
-   * @param {Zone} zone
-   * @param {string} key
-   * @param {(k: string) => V} makeValue
-   * @returns {V}
-   */
-  const provideFromZone = (zone, key, makeValue) => {
-    const map = zone.mapStore(`singleton_${key}_store`);
-    return provide(map, key, makeValue);
-  };
-  harden(provideFromZone);
-
   /**
    * Provides for the recovery of newly minted but not-yet-deposited payments.
    *
    * Because the `mintRecoveryPurse` is placed in baggage, even if the
    * caller of `makeIssuerKit` drops it on the floor, it can still be
    * recovered in an emergency upgrade.
    */
+  // Should be
+  // at-ts-expect-error checked cast
+  // but ran into the usual disagreement between local lint and IDE lint.
+  // Don't know yet about lint under CI.
+  // eslint-disable-next-line @typescript-eslint/prefer-ts-expect-error
+  // @ts-ignore
   const mintRecoveryPurse = /** @type {Purse<K>} */ (
-    provideFromZone(issuerZone, 'mintRecoveryPurse', () => makeEmptyPurse())
+    issuerZone.once('mintRecoveryPurse', () => makeEmptyPurse())
   );
 
   /** @type {Mint<K>} */