Understanding infer in TypeScript
- Introduction
- The
infer keyword in TypeScript is used to extract and store type information for later use.
- Using
infer
- When a library function does not provide a standalone type for an argument, defining a variable beforehand may not lead to correct type inference by TypeScript.
- The conditional typing and
infer keyword allow isolating and storing type information for later use.
- Conditional types and unions
- Conditional types can be used to create complex type conditions and unions in TypeScript.
- Extending a union as a constraint in TypeScript involves looping over each member of the union and returning a union of its own.
- Using
extract in TypeScript
- The
extract keyword in TypeScript is used to extract types from arrays.
- It can be used in more complex recursive type operations, such as flattening nested arrays.
- Using
extract in React props
- In React, the
extract keyword can be used to extract prop types from React components.
- Using
extract in generic functions
extract can be used in generic functions to define types for function parameters and return types based on inferred types.- By using a functional interface together with
extract, more generic and reusable types can be defined for functions.
