从javascript生成打字稿声明文件 [英] Generating typescript declaration files from javascript

问题描述

比如说，你有一个 npm 库，在我的例子中是 mongoose，你会如何生成 d.ts 文件?

Say for example, you have a npm library, in my case mongoose, how would you go about generating d.ts files?

推荐答案

JavaScript 并不总是包含足够的类型信息供 TypeScript 编译器推断代码中的结构 - 因此基于 JavaScript 自动生成定义很少是一种选择.

JavaScript doesn't always contain enough type information for the TypeScript compiler to infer the structures in your code - so automatically generating a definition based on JavaScript is rarely an option.

这里有关于如何从头开始编写它们的说明:

There are instructions on how to write them from scratch here:

https://www.stevefenton.co.uk/2013/01/complex-typescript-definitions-made-easy/

但是有一个技巧可能会奏效(它只在有限的情况下有效).

But there is one trick that might work (it only works in a limited set of cases).

如果您将 JavaScript 粘贴到新的 TypeScript 文件中，修复您可能遇到的任何小错误并使用定义标志编译它，它可能会为您提供一个至少可以作为起点的文件.

If you paste the JavaScript into a new TypeScript file, fix any trivial errors you may get and compile it using the definition flag, it may be able to get you a file that would at least be a starting point.

tsc --declaration js.ts

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