How to set the Accept header?

[T3rm1]

When using the function

octokit.rest.repos.getContent({
  owner,
  repo,
  path,
});

the documentation says that it is possible to use custom media types. However it is not explained how this is done.
How can I set the Accept header for this request to application/vnd.github.v3.raw+json?

[wolfy1339]

const { data } = octokit.rest.repos.getContent({
  mediaType: {
    format: "raw",
  },
  owner: "octocat",
  repo: "hello-world",
  path: "package.json",
});
console.log("package name: %s", JSON.parse(data).name);

https://github.com/octokit/octokit.js#media-type-previews-and-formats