Error: "expected token ..." when trying to use the notion client npm package inside a figma plugin

I want to use the notion client sdk inside a Figma plugin. It’s just used to call the Notion api, nothing particularly fancy about it. I get an error when I try to use it.

When I do this in some file:

import { Client, LogLevel } from "@notionhq/client";
export const notion = new Client({"<my credentials>"});

And then import the client in another file

import { notion } from "./someFile";
console.log(notion);

I get the following error:

Syntax error on line 372: Unexpected token ...
            ...authorizationHeader,

I probably have ran into this issue before in my life but don’t remember what it was. Probably some incompatibility issue. How do you generally debug these things? I have limited information on where to even look.

Thanks in advance if you have any ideas.