Import AITURK IDE 1.0.0-beta.1 from Hermes 63279301; preserve MIT license

apps/shared/src/billing-payment-method.test-d.ts

@@ -0,0 +1,24 @@
+/**
+ * Compile-time guard for BillingPaymentMethod.
+ *
+ * There is nothing to run here — the point is that `tsc` accepts this file.
+ * An earlier revision typed the fallback arm's `kind` as `string & {}`, which
+ * makes the discriminant non-literal and silently defeats narrowing for every
+ * arm: the `pm.brand` read below stops compiling. Keeping this file honest
+ * keeps `kind` narrowable.
+ */
+
+import type { BillingPaymentMethod } from './billing-types'
+
+export function describePaymentMethod(pm: BillingPaymentMethod): string {
+  switch (pm.kind) {
+    case 'card':
+      return pm.wallet ? `${pm.wallet} ${pm.brand} ${pm.last4}` : `${pm.brand} ${pm.last4}`
+
+    case 'link':
+      return pm.email ?? 'Link'
+
+    case 'unknown':
+      return pm.raw_kind
+  }
+}