TypeScript Trivia Questions

Anders Hejlsberg, lead architect of C#, designed TypeScript; it debuted at the Build conference in 2012.

TypeScript infers types automatically from values; for example, 'let x = 5' gives x the type 'number' without annotation.

Browsers don't understand TypeScript natively; it must be compiled to JavaScript before execution.

Unlike 'any', 'unknown' requires explicit type narrowing (e.g., typeof checks) before you can operate on the value, preventing errors.

TypeScript only checks types at compile time; at runtime, types are erased and it behaves like plain JavaScript.

'any' opts out of type checking entirely, allowing any operations without errors—useful for migration but risky.

While mostly structural (duck typing), TypeScript uses nominal typing for enums and classes with private fields.

Conditional types, template literals, and recursion allow TypeScript types to solve arbitrary computations, like a programming language.