basePath option

[Elias-Graf]

I use this library as it was recommended by one of your sister projects, NextJS. NextJS has the option to configure a basePath in the next.config.js. I couldn't find the option here, so swr is not really usable in a NextJS project with the basePath set.

My current workaround:

// `pages/_app.tsx`
import { SWRConfig } from "swr";
import config from "next.config";

export default function App({
  // [...]
}): ReactElement {
  // [...]
  return (
    <SWRConfig value={{ fetcher }}>
      {/* [...] */}
    </SWRConfig>
  )
  // [...]
}

function fetcher(path: string, init: RequestInit) {
  if (path[0] === "/") path = config.basePath + path;

  return fetch(path, init).then((res) => res.json());
}