What are the limitations of TypeScript's type system and how can they be worked around?

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TypeScript Interview Questions

  1. [JUNIOR] What is TypeScript and how does it differ from JavaScript?
  2. [MID] What are generics in TypeScript and how do they contribute to reusability?
  3. [JUNIOR] What are the benefits and advantages of using TypeScript over JavaScript?
  4. [JUNIOR] What are the primitive types in TypeScript?
  5. [JUNIOR] What is the `unknown` type and how does it differ from `any`?
  6. [JUNIOR] What is type inference in TypeScript?
  7. [JUNIOR] What are interfaces in TypeScript and how do they work?
  8. [JUNIOR] What are the differences between `type` and `interface` in TypeScript?
  9. [MID] What is type narrowing and how does TypeScript implement it?
  10. [MID] What is the `keyof` keyword in TypeScript and how is it used?
  11. [JUNIOR] What is the `any` type in TypeScript and when should it be used?
  12. [JUNIOR] What is the `never` type and when would you use it?
  13. [JUNIOR] How do you define a function with type annotations in TypeScript?
  14. [JUNIOR] How do arrays work in TypeScript and how do you define typed arrays?
  15. [JUNIOR] What is a tuple in TypeScript and how does it differ from an array?
  16. [JUNIOR] What is a type alias in TypeScript and how do you create one?
  17. [JUNIOR] What are union types in TypeScript?
  18. [MID] How do generic constraints work in TypeScript and why are they useful?
  19. [MID] What are intersection types in TypeScript?
  20. [MID] What are type guards in TypeScript and how do they enhance type safety?
  21. [MID] What are mapped types in TypeScript and how are they used?
  22. [MID] What is the difference between `Partial<T>`, `Required<T>`, and `Pick<T, K>` utility types?
  23. [SENIOR] What are discriminated (tagged) unions and how are they implemented in TypeScript?
  24. [SENIOR] How do you use conditional types combined with the `infer` keyword for complex type relationships?
  25. [SENIOR] What are recursive types in TypeScript and when would you use them?
  26. [JUNIOR] What is the `void` type in TypeScript and when is it used?
  27. [JUNIOR] How do you define a function with optional and default parameters in TypeScript?
  28. [JUNIOR] What are enums in TypeScript and how do they work?
  29. [JUNIOR] What is type assertion in TypeScript and how is the `as` keyword used?
  30. [JUNIOR] What is the purpose of the `tsconfig.json` file?
  31. [MID] What are conditional types in TypeScript and how do you create them?
  32. [MID] What are template literal types in TypeScript and how are they useful?
  33. [MID] What is the `Record<K, T>` utility type and how do you use it?
  34. [MID] What are abstract classes in TypeScript and when should they be used?
  35. [MID] What are access modifiers (public, private, protected) in TypeScript?
  36. [MID] What is a type declaration file (`.d.ts`) and how do you use it?
  37. [MID] What is the `infer` keyword in TypeScript and how does it work?
  38. [SENIOR] What is the `as const` assertion in TypeScript and how does it help in defining literal types?
  39. [SENIOR] Explain the `ReturnType`, `Parameters`, and `InstanceType` utility types and how they work internally?
  40. [SENIOR] How does TypeScript's type erasure process work and how does it affect runtime behavior?
  41. [SENIOR] How do you perform runtime validation of types in TypeScript?
  42. [SENIOR] How would you migrate a large JavaScript project to TypeScript incrementally?
  43. [EXPERT] How do you use mapped types combined with conditional types to build advanced utility types?
  44. [JUNIOR] What is `null` and `undefined` in TypeScript and how do they differ?
  45. [JUNIOR] What are rest parameters in TypeScript and what rules apply when declaring them?
  46. [JUNIOR] What is a string enum and how does it differ from a numeric enum?
  47. [JUNIOR] What is the `typeof` type operator in TypeScript and how is it used?
  48. [MID] What are string literal types in TypeScript?
  49. [MID] How do you use the `Omit<T, K>` and `Exclude<T, U>` utility types in TypeScript?
  50. [MID] What is the difference between an interface and an abstract class?
  51. [MID] How do you implement method overloading in TypeScript?
  52. [MID] What is declaration merging in TypeScript?
  53. [MID] How does TypeScript handle module resolution?
  54. [MID] How do you enforce strict null checks in TypeScript?
  55. [SENIOR] What is module augmentation in TypeScript and how would you extend a third-party module's type definitions?
  56. [SENIOR] How does TypeScript work with the `this` context and what are common pitfalls?
  57. [SENIOR] How would you design a type-safe API that returns different data types based on input parameters?
  58. [SENIOR] What are the best practices for organizing and structuring a large TypeScript codebase?
  59. [SENIOR] How do you create and use custom decorators in TypeScript?
  60. [EXPERT] How do you implement higher-kinded types or simulate them in TypeScript?
  61. [EXPERT] How do you implement higher-order functions with full type safety and generic inference in TypeScript?
  62. [JUNIOR] What is the `readonly` keyword in TypeScript and what is its purpose?
  63. [MID] What is the `NonNullable<T>` utility type and when should it be used?
  64. [MID] What are decorators in TypeScript and how are they used?
  65. [MID] What are namespaces in TypeScript and how do they differ from modules?
  66. [MID] What are triple-slash directives in TypeScript?
  67. [MID] How does TypeScript handle type compatibility and structural typing?
  68. [SENIOR] What are ambient declarations in TypeScript and how do they work?
  69. [SENIOR] How do you use the `asserts` keyword for assertion functions in TypeScript?
  70. [SENIOR] How do you create a type-safe event emitter or observer pattern in TypeScript?
  71. [SENIOR] How would you implement type-safe dependency injection in TypeScript?
  72. [EXPERT] How do you handle variance (covariance and contravariance) in TypeScript's type system?
  73. [EXPERT] How would you implement a type-safe state management system using TypeScript's advanced type features?
  74. [EXPERT] How do you use TypeScript's type system to enforce custom validation or transformation logic at compile time?
  75. [JUNIOR] What is the difference between `.ts` and `.tsx` file extensions?
  76. [MID] What is contextual typing in TypeScript?
  77. [SENIOR] How do you handle type-safe error handling with discriminated unions?
  78. [SENIOR] How do you ensure type safety when working with external REST APIs in TypeScript?
  79. [EXPERT] What are the limitations of TypeScript's type system and how can they be worked around?
  80. [EXPERT] How do you optimize TypeScript compilation and type-checking performance in large codebases?
  81. [EXPERT] How do you use type inference with generics and conditional types to create dynamic adaptable components?
  82. [SENIOR] How do you integrate TypeScript with GraphQL in a type-safe manner?
  83. [EXPERT] What is the concept and application of monads in TypeScript?
  84. [EXPERT] How would you implement type-safe pattern matching in TypeScript?
  85. [EXPERT] How would you design a type-safe API contract-first approach using TypeScript?
  86. [EXPERT] How do you implement advanced patterns with recursive generics and self-referencing types?
  87. [EXPERT] How would you implement a type-safe event-driven architecture across microservices in TypeScript?