TypeScript provides some built-in utility types that help facilitate transformations of types from one form to another.

These utilities are available globally. They can be quite handy in various situations.

TypeScript generics

Before understanding the TypeScript utility types, it is important to understand type aliases and generics. You can create type aliases for any existing type in TypeScript.

type MyString = string;

let helloWorldMessage: MyString = 'Hello Wisdom Geek';

Type generics are used to create reusable type aliases. Let us say we had an identity function which returns whatever value is passed back in:

Type generics are used to create reusable type aliases. Let us say we had an identity function which returns whatever value is passed back in:

const identity = (arg: string): string => arg;

What if we wanted to use the function for a number? We could replace the specific type with any.

const identity = (arg: any): any => arg;

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