I need a global variable for the duration of the plugin, or any advice

[romanusname]

Hello! I am creating an SWC plugin. I will be as brief as possible. The user can style HTML (jsx) elements with attributes.
<div background="red">123</div>

The plugin adds a class attribute with a unique id.
<div className="style642">123</div>
And creates a css file with all found styles

my problem:
swc does not allow you to read files. I can't add new styles to css when they are found. I can only completely replace the contents of a file
fs::write("test.css", data).expect("Unable to write file");

I created a global variable

pub struct TransformVisitor {    
    styles:String,
}

When I find the style attribute, I put the style on that line, and write the whole line to a file

But this variable is cleared for each component.

export default function Home() {
    return (
            <>
                 <MyComp></MyComp>
                 <p background={"red"}>123</p>
            </>
   )}

During the processing of "MyComp", the styles of the "Home" component will be removed.
Only the styles of one component remain in the file.

Help me please. I need a global variable for the duration of the plugin, or any advice.

[kwonoj]

Answered in here and for the visibility :#4997 (reply in thread) It's not about fs more about the approach: if components are separated into different files, no, there's no global lifetime you can expect to store-at-read once some states.

[kwonoj]

Just to be clear, if it's in single file have multiple components that you need to store states, in-memory struct property should work. However SWC does not provides guaranteed order of file process, or lifecycles that each transform (not only plugin) access global states in a specific order.