FRONTEND S07 L09 Project Conversion to TypeScript Part 3 (Null Checks)

Description

📘 PROJECT CONVERSION TO TYPESCRIPT PART 3 — NULL CHECKS AND FINAL RUN In this final conversion lesson, we fix remaining null-related type errors, add safer context access patterns, and complete an error-free TypeScript migration. You will apply type guards, introduce a custom context helper hook, and verify the converted app through type check, dev, build, and preview workflows. 🎯 IN THIS VIDEO Identify remaining null-related TypeScript errors in converted components Add type guards before destructuring context values Use explicit error throwing for invalid context usage paths Understand how type narrowing resolves union-with-null issues Create a reusable context helper function to centralize safety checks Replace repeated context access logic in components with the helper Add root element null checking in the application entry file Run full validation with type check, dev server, build, and preview commands 🚀 HOW TO USE THIS COURSE This lesson completes the migration by turning compiler warnings into robust runtime-safe patterns. The helper-hook and null-guard approach used here is a practical template for larger React TypeScript projects. 👉 Course Website: www.richardbraycourses.co.uk 👉 Course Repositories: www.github.com/RichardBrayCourses 👉 Full course playlist: https://youtube.com/playlist?list=PLNlOxdq7xu14b5ewH4IJC9tMinkgZBuVR&si=Pg8pEDR5UUbQstz6 📂 SECTION REPOSITORY Section 7 repository: https://github.com/RichardBrayCourses/frontend07-typescript 💡 NOTE Centralizing null-guard logic in a helper hook reduces duplication and keeps component code cleaner and safer.