Using api routes with firebase hosting isn't working properly

[jahirfiquitiva]

Bug report

Describe the bug

I've setup my project like in this project and I want to use some api routes, so I have created the function and everything in the api folder and stuff.

Anyways, when I run the app with next dev I get the following error:

This is the api function code, just in case:

export default async (req, res) => {
  const { site } = req.query;
  if (!site || site.length <= 0) return res.json([]);
  const request = await fetch(`https://another-website.com/api/site/videos?site=${site}`);
  const response = request.json();
  return res.json(response.data);
};

What could I be doing wrong? How can I solve this?
Thanks in advance

System information

• OS: macOS
• Version of Next.js: 9.5.1
• Version of Node.js: 12.18.1