当我想使用文件缓冲区调用函数时，我必须使用哪种打字稿类型？

Question

I want read an image in filebuffer, change this in a function and than write back.

In Javascript:

const changeImage = ( buf) => {
     ... change buf

    return buf
}

let imageFileBuffer = fs.readFileSync('./in.png');
let newBuf = changeImage(imageFileBuffer)
fs.writeFileSync('out.png', newBuf);

How do i convert this to typescript? What is the type of buf?

Answer 1

If you run npm install -D @types/node , you will have node types available. After doing this, reload your window (close VS Code, or do CTRL + SHIFT + P and select reload [CMD + SHIFT + P on mac]).

Now hover over your imageFileBuffer variable to see what type it is (should just be Buffer). Then add the type to your variable to get the intellisense to do the import of the type.

EDIT

I just checked one of my projects and there is nothing to import after installing the types package. They are defined as global.