Type alias in typescript

type StringAlias = string;
type NumberAlias = number;
// aliases for 'normal' types

type SixAlias = 6;         
type MyFavouriteFood = "burger"; 
// aliases for 'literal' types
// these are usually useless on their own

type Food = MyFavouriteFood | "pizza" | "pasta" | "salad";
// they get useful when you combine them:
// a Food can be one of these choices.

type Foods = Food[];
// this is an alias for an array of Foods.

type SuccessfulResponse = {
	message: string,
  	statusCode: number,
  	attachment?: string,
	preferredFoods?: Foods,
}                          
// Now we define a SuccessfulResponse type as the type of a
// JS literal object with two required and two optional attributes.
// Note that you could also use an interface in this case.

type SuccessfulResponseHandler = (res: SuccessfulResponse) => void;
// This is a type alias for a function.


// tl;dr: You can alias every type in TypeScript and chain them.
// This is very useful for reusability and readability.

Similar codes

0 vote245 views1 answer
Factory design pattern typescript
TypeScript
0 vote185 views1 answer
Typescript assert non null
TypeScript
10 votes182 views3 answers
Foreach typescript
TypeScript
0 vote271 views2 answers
Integrationtest typescript
TypeScript
2 votes150 views3 answers
Module not found: Error: Can't resolve 'core-js/es7/reflect'
TypeScript
0 vote118 views1 answer
Which document is created by system analyst after the requirements are collected from various stakeholders?
TypeScript
35 votes162 views6 answers
Comments in html
TypeScript
0 vote190 views1 answer
Deno current directory
TypeScript
0 vote182 views1 answer
Typescript not supporting scss
TypeScript
0 vote154 views1 answer
Dig WWW.EXAMPLE.COM +nostats +nocomments +nocmd
TypeScript