d-ts声明文件

https://stackoverflow.com/questions/21247278/about-d-ts-in-typescript

// 区别？
export declare const thing: number;
export  const thing: number;  

https://www.typescriptlang.org/dt/search?search=

https://github.com/DefinitelyTyped/DefinitelyTyped

npm管理

在node_modules的@types模块下

import calculator from 'calculate'
calculator('plus',[1,2])
calculator.plus([1,2])

type IOperator = 'plus' | 'minus'

interface ICalculator{
    (operator: IOperator, numbers: number[]): number;
    plus: (numbers: number[]) => number;
    minus: (numbers: number[]) => number;
}

declare const calculator: ICalculator
export default calculator