TypeScript interview questions that expose fake experience fast (Part 6) 👇

"I use TypeScript" and "I understand TypeScript" are two very different interviews. Here's where they split:

1️⃣ interface vs type — when do you actually HAVE to pick one?
→ Only interfaces can be reopened/extended by declaration merging. Union types can only be done with 'type'. Most "just use type everywhere" advice ignores this.

2️⃣ What does 'unknown' give you that 'any' doesn't?
→ 'any' disables type checking entirely. 'unknown' forces you to narrow/check the type before using it. Using 'any' everywhere defeats the point of TypeScript.

3️⃣ What is a type guard? Write one in your head.
→ A function like isString(x): x is string — narrows a union type inside an if-block. Interviewers ask this to see if you've used TS beyond basic annotations.

4️⃣ Explain generics with a real example, not <T>.
→ function getFirst<T>(arr: T[]): T — works for any array type while keeping the return type accurate. If you can't give an example, you've only copy-pasted generics.

5️⃣ What's the difference between 'as' casting and actual type safety?
→ 'as' just tells the compiler to trust you — it doesn't check anything at runtime. Overusing 'as' is how bugs sneak into "type-safe" code.

6️⃣ Partial<T>, Pick<T>, Omit<T> — when would you reach for each?
→ Partial for update DTOs, Pick for exposing a subset (like a public user object), Omit for hiding fields (like password). Real backend use, not textbook.

7️⃣ Why does strict: true in tsconfig matter so much?
→ Without it, TypeScript silently allows null/undefined bugs that defeat half the reason to use it. Teams that disable strict mode are writing JavaScript with extra steps.

Save this before your next interview. 🔖

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