feat: TxStatus const for StatusManager states

packages/fast-usdc/src/constants.js

@@ -0,0 +1,27 @@
+/**
+ * Status values for FastUSDC.
+ *
+ * @enum {(typeof TxStatus)[keyof typeof TxStatus]}
+ */
+export const TxStatus = /** @type {const} */ ({
+  /** tx was observed but not advanced */
+  Observed: 'OBSERVED',
+  /** IBC transfer is initiated */
+  Advanced: 'ADVANCED',
+  /** settlement for matching advance received and funds dispersed */
+  Settled: 'SETTLED',
+});
+harden(TxStatus);
+
+/**
+ * Status values for the StatusManager.
+ *
+ * @enum {(typeof PendingTxStatus)[keyof typeof PendingTxStatus]}
+ */
+export const PendingTxStatus = /** @type {const} */ ({
+  /** tx was observed but not advanced */
+  Observed: 'OBSERVED',
+  /** IBC transfer is initiated */
+  Advanced: 'ADVANCED',
+});
+harden(PendingTxStatus);

packages/fast-usdc/test/constants.test.ts

@@ -0,0 +1,12 @@
+import { test } from '@agoric/zoe/tools/prepare-test-env-ava.js';
+import { TxStatus, PendingTxStatus } from '../src/constants.js';
+
+const { values } = Object;
+
+test('PendingTxStatus is a subset of TxStatus', t => {
+  const txStatuses = values(TxStatus);
+  const difference = values(PendingTxStatus).filter(
+    status => !txStatuses.includes(status),
+  );
+  t.deepEqual(difference, [], 'PendingTxStatus value(s) not in TxStatus');
+});