Check if a user is a repository collaborator

type Github = {

  token: string;

};

/**

 * Check if a user is a repository collaborator

 * For organization-owned repositories, the list of collaborators includes outside collaborators, organization members that are direct collaborators, organization members with access through team memberships, organization members with access through default organization permissions, and organization owners.

 */

export async function main(

  auth: Github,

  owner: string,

  repo: string,

  username: string

) {

  const url = new URL(

    `https://api.github.com/repos/${owner}/${repo}/collaborators/${username}`

  );

  const response = await fetch(url, {

    method: "GET",

    headers: {

      Authorization: "Bearer " + auth.token,

    },

    body: undefined,

  });

  if (!response.ok) {

    const text = await response.text();

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

  }

  return await response.text();

}