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All LessonsFree Lessons (4)

Strict types

No Implicit `any`

Fixing `noImplicitAny` Errors

The `unknown` Type

Strict Null Checks

Strict Property Initialization

Non-Null Assertion Operator

Exercise in Strictness

Generics

Introduction Function Types Generic Functions Generic Functions Example - Typing `reduce`Generic Interfaces - OOP Perspective Generic Interfaces - FP Perspective Type Argument Constraints Type Constructors Type Argument Propagation

Composing types

Introduction Union and Intersection Types Discriminated Union Types Discriminated Unions in Practice State Machines Discriminated Unions vs Subtyping

Advanced types

Introduction Conditional Types Introduction Built-in Conditional Types The `infer` Keyword Conditional Types Example - React Component Props Mapped Types Introduction Built-in Mapped Types Type Guards Custom Type Guards Nominal Types

TypeScript in practice

Introduction Debugging Errors: Type Assignability Debugging Errors: Narrowing Types Debugging Errors: Unintuitive Error Message React and TypeScript: `useState` Hook React and TypeScript: `useReducer` Hook RxJS and TypeScript: `pipe`

Conclusion

Advanced TypeScript Masterclass/

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No Implicit `any`

No Implicit `any`

This lesson introduces the `noImplicitAny` compiler flag.

We'll cover the following...

- Definition
- noImplicitAny in practice

Definition

The first and the most important flag is noImplicitAny. Let’s look at its definition from the documentation:

Raise error on expressions and declarations with an implied any type.

In other words, when you ...