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TypeScript Academy · Lesson

Type Inference and Contextual Typing

Learn how TypeScript automatically infers types

1

What is Type Inference?

Type inference is a feature in TypeScript that automatically determines the type of a variable or expression based on its value.

For example, when you write let age = 25;, TypeScript infers that age is of type number.

Type Inference and Contextual Typing — illustration 1

2

Benefits of Type Inference

Type inference reduces the need to explicitly declare types, making your code cleaner and easier to write.

It also helps TypeScript catch errors during development, ensuring type safety without adding extra annotations.

All lessons in this course

  1. Type Inference and Contextual Typing
  2. Decorators in TypeScript
  3. TypeScript Modules and Namespaces
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