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Type safety stops your project from crashing in production. I once thought JavaScript was enough. I was wrong.
TypeScript is JavaScript with a type layer. It protects you from mistakes. In JavaScript, you put a string in a number variable. No one tells you. The app crashes. TypeScript stops this immediately. It saves hours of debugging.
Use interfaces to define your objects. You know exactly what fields exist. Use union types for specific values. For example, a user role must be admin, user, or moderator. TypeScript rejects wrong values before you run the code.
Generics let you write safe code for different types. Stop using any. Use generics for API responses. This stops you from using missing fields.
Utility types save time.
- Partial makes fields optional for updates.
- Pick selects specific fields.
- Omit removes fields. This keeps your code clean.
Use strict mode from day one. Stop using any. If you need a flexible type, use unknown. This forces you to check types before use.
TypeScript changes how you think. You plan your data before you write code. This makes your design better.
Start with one file. Turn on strict mode. See the difference.