Basics & the Type System

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1. 1 What problems does TypeScript solve over plain JavaScript, and what does it NOT solve at runtime? Easy
2. 2 What's the difference between `any`, `unknown`, and `never`? Medium
3. 3 What is structural typing ('duck typing'), and how does it differ from nominal typing? Medium
4. 4 What's the difference between `type` aliases and `interface`, and when do you pick each? Medium
5. 5 What does `strict` mode turn on, and why is `strictNullChecks` the most impactful flag? Medium
6. 6 What's the difference between a type and a value, and how can a name be both? Medium
7. 7 Why is `[]` inferred as `never[]` sometimes, and how do you fix it? Hard