Create a GitHub App from a manifest

type Github = {

  token: string;

};

/**

 * Create a GitHub App from a manifest

 * Use this endpoint to complete the handshake necessary when implementing the [GitHub App Manifest flow](https://docs.github.com/apps/building-github-apps/creating-github-apps-from-a-manifest/). When you create a GitHub App with the manifest flow, you receive a temporary `code` used to retrieve the GitHub App's `id`, `pem` (private key), and `webhook_secret`.

 */

export async function main(auth: Github, code: string) {

  const url = new URL(

    `https://api.github.com/app-manifests/${code}/conversions`

  );

  const response = await fetch(url, {

    method: "POST",

    headers: {

      Authorization: "Bearer " + auth.token,

    },

    body: undefined,

  });

  if (!response.ok) {

    const text = await response.text();

    throw new Error(`${response.status} ${text}`);

  }

  return await response.json();

}