fix(internationalized-array): resolve TypeScript lint errors in test files

[Copilot]

The test suite had 15 TypeScript lint errors preventing CI from passing. All errors were in test files and related to type safety issues with mocks and assertions.

Changes

• Index signature property access - Changed item._key to item['_key'] for properties accessed via index signatures (TS4111)
• Type guards over assertions - Replaced unsafe type assertions with proper type guards:

  // Before
  const schema = createObjectSchema({type: 'string'}) as ObjectSchemaWithFields
  
  // After
  const schema = createObjectSchema({type: 'string'})
  if (!hasFields(schema)) throw new Error('Expected schema to have fields')

• Validation result typing - Added ValidationResult union type and type narrowing for test assertions:

  type ValidationResult = true | {message: string; paths: Array<Array<{_key: string}>>}
  
  const result = await runValidation(value)
  if (result !== true) {
    expect(result.paths).toEqual([[{_key: 'en'}]])
  }

• Mock suppression - Used @ts-expect-error for intentional mock implementations that deviate from production types

All 114 tests pass with 0 lint errors.

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
plugins-studio	Ready	Preview, Comment	Feb 4, 2026 2:16pm

[changeset-bot]

⚠️ No Changeset found

Latest commit: ee35f3a

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR