Merge branch 'feat/support-rootparams' into feat/v4-rootparams

Author: amannn

packages/use-intl/src/core/hasLocale.test.tsx

@@ -1,4 +1,4 @@
-import {it} from 'vitest';
+import {expect, it} from 'vitest';
 import hasLocale from './hasLocale.tsx';
 
 it('narrows down the type', () => {
@@ -24,3 +24,12 @@ it('can be called with a non-matching narrow candidate', () => {
     candidate satisfies never;
   }
 });
+
+it('can be called with any candidate', () => {
+  const locales = ['en-US', 'en-GB'] as const;
+  expect(hasLocale(locales, 'unknown')).toBe(false);
+  expect(hasLocale(locales, undefined)).toBe(false);
+
+  // Relevant since `ParamValue` in Next.js includes `string[]`
+  expect(hasLocale(locales, ['de'])).toBe(false);
+});