PnP JS handle error if case "overwrite: false" enters

My Code:

try{
    if (file.size <= 1048) {
    result = await sp.web.lists
    .getByTitle(documentLibraryTitle)
    .rootFolder.files.addUsingPath(fileNamePath, file, { Overwrite: false });
    } 
    else{
       throw new Error(`The filename already exists!`);
    }
} catch (err) {
              console.error("something went wrong", err);
              throw new Error("something went wrong");
    }

What I'm trying to do is, if the case "Overwrite:false" (=Trying to upload an existing File with same Name) ...enters, i want to return the first error inside the else brackets.

Instead of that as result i always get the error inside the catch brackets. Anyone have an idea to fix this behaving?

I could think of two options. First option: you check that the file exists before trying to overwrite it, and if it does, then throw your error. Second option: you analyze the pnpjs error message, and if is about file being already there, throw your error message.

First:

const exists = await sp.web.lists
  .getByTitle(documentLibraryTitle).rootFolder.files
  .getByName(fileNamePath) // or .getByUrl()
  .exists();

if (exists) {
  throw new Error(`The filename already exists!`);
}

// ... upload file like you do now ...

Second:

try {

  await sp.web.lists
    .getByTitle(documentLibraryTitle).rootFolder.files
    .addUsingPath(fileNamePath, file, { Overwrite: false });

} catch (e) {

      // see "error handling in pnpjs"
      // https://pnp.github.io/pnpjs/concepts/error-handling/#reading-the-response

      if (e.isHttpRequestError) {

        // get the response
        const data = await e.response.json();

        // fetch error code
        const code = typeof data["odata.error"] === "object" ? data["odata.error"].code : null;

        // it's about overwrite
        if (code === '-2130575257, Microsoft.SharePoint.SPException') {
          throw new Error(`The filename already exists!`);
        }
      }
    }
}