Tag: React

All the articles with the tag "React".

• TypeScript: object is possibly 'undefined'

  Updated:Oct 23, 2026 |  at 08:30 PM

  TS2532: Object is possibly 'undefined'. TS18048: 'players' is possibly 'undefined'. Guard the value before you read it. The ! operator only hides the error.

• How to Make Next.js 13 More SEO-Friendly

  Updated:Mar 10, 2023 |  at 02:04 PM

  Are you struggling with getting your Next.js 13 app to rank well on search engines? I’ll show you some essential SEO optimizations that you can implement.

• Mocking GraphQL response for React components using MockedProvider

  Updated:Feb 26, 2023 |  at 06:06 PM

  In GraphQL-powered React apps, testing component behavior based on GraphQL data is a common scenario. Let's see how to achieve that with MockedProvider.

• How to Write Stronger Unit Tests with Jest

  Updated:Jun 14, 2023 |  at 10:08 AM

  We'll explore why weak tests can leave changes in behavior to land unnoticeably and what we can do to catch these changes early.

• How to Test Custom Hooks with React Testing Library and Jest

  Updated:Jun 14, 2023 |  at 10:08 AM

  Learn how to test your custom React Hooks with React Testing Library and Jest. You'll find an interactive Codesandox at the end of the post.

• How to test props in React Testing Library

  Updated:Oct 23, 2026 |  at 12:00 PM

  Mock the child with jest.mock and read the prop from the text. On Jest 30 the mock variable's name has to start with mock.