Go deep on TypeScript’s type system — generics and constraints, inference, narrowing, unions and discriminated unions, conditional and mapped types, the utility types, and the strictness rules — through real code-based questions with clear explanations. Built to take you from solid to expert and to ace the TypeScript questions in senior-engineer interviews. Part of the Developer track.
• Meets you at your level — never too easy, never too hard.
• Adapts every question to how you’re doing.
• Tracks your level over time. Skill practice, not a test.
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