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0 pointscwyers8y ago0 comments

> vscode seems to figure out the types in javascript without any static typing.

Doesn't it do this by treating Javascript as a statically-typed language (Typescript) and using type inference?

0 comments

198732872348y ago

No it works without using typescript. I just figures it out through... I have never thought about it. I mean, var p = new Cat();. I am sure it can find the cat definition easy and read the properties and so on. It probably can't prove things 100% but it can guess very well at what things are.

cwyersOP8y ago

> I just figures it out through... I have never thought about it.

https://github.com/Microsoft/TypeScript/wiki/JavaScript-Lang...

> Visual Studio 2017 provides a powerful JavaScript editing experience right out of the box. Powered by a TypeScript based language service, Visual Studio delivers richer IntelliSense, support for modern JavaScript features, and improved productivity features such as Go to Definition, refactoring, and more.

It works off Typescript type annotations for packages and the Typescript compiler's type inference. VS Code's Javascript editing does not seem to be evidence for tooling around dynamic languages so much as it's evidence that if you have a lot of money and Anders Hejlsberg you can write a compiler for a statically typed language with type inference that looks like a specific dynamic language.

DanRosenwasser8y ago

Our team (TypeScript) powers this experience.

FLUX-YOU8y ago

>I just figures it out through... I have never thought about it.

Are there not definitions written by someone or a tool that vscode looks at?

That is what I saw using some npm packages with typescript: http://definitelytyped.org/

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