TypeScript declare type vs type in .d.ts file All In One

TypeScript declare type vs type in .d.ts file All In One

declare type vs type

// declare type alias
declare type API = string;

//  type alias
type API = string;

demos

1. test.ts => test.d.ts

// declare type
declare type API = string;

function test(url: API){
  console.log(`✅ url =`, url);
  return url;
}

export default test;

2. test.ts => test.d.ts

// type
type API = string;

function test(url: API){
  console.log(`✅ url =`, url);
  return url;
}

export default test;

输入	输出	截图
declare type API = string;	declare type API = string;
type API = string;	type API = string;

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refs

https://github.com/xgqfrms/learn-typescript-by-practice

Declaration Files

https://github.com/xgqfrms/learn-typescript-by-practice/tree/master/TypeScript-Handbook-2/05 Declaration Files

handbook declaration files

https://www.typescriptlang.org/docs/handbook/declaration-files/introduction.html

$ npm i -D typescript
$ npm i -D @types/node @types/react

https://www.npmjs.com/package/@types/node

https://www.npmjs.com/package/@types/react

https://github.com/DefinitelyTyped/DefinitelyTyped

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