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TypeScript Fundamentals
TypeScript type system essentials: types, interfaces, generics, and advanced patterns for full-stack development.
Time
Compiles to JavaScript
Space
Types are erased at runtime
🧠Mental Model
“Safety nets for JavaScript - types catch you before you fall into runtime errors.”
Verbal cue: Define the shape, let the compiler validate.
🎯Recognition Triggers
When you see these patterns in a problem, consider this approach:
TypeScripttype safetystatic typingJavaScript with types
💡Interview Tips
- 1Know the difference between interface and type
- 2Understand utility types (Partial, Pick, Omit)
- 3Be able to write generic functions
⚠️Common Mistakes
- ✕Overusing any (defeats the purpose)
- ✕Not leveraging strict mode
- ✕Ignoring null/undefined narrowing