Create Branch

//native

/**

 * Create Branch

 * Create a branch from the head of from_branch (the repository's default branch when empty).

 */

export async function main(

  auth: RT.Github,

  owner: string,

  repo: string,

  branch: string,

  from_branch: string | undefined

) {

  const headers = {

    Authorization: `Bearer ${auth.token}`,

    Accept: "application/vnd.github+json",

    "X-GitHub-Api-Version": "2022-11-28",

  }

  const base = `https://api.github.com/repos/${owner}/${repo}`

  if (!from_branch) {

    const r = await fetch(base, { headers })

    if (!r.ok) throw new Error(`${r.status} ${await r.text()}`)

    from_branch = ((await r.json()) as { default_branch: string })

      .default_branch

  }

  const ref = await fetch(`${base}/git/ref/heads/${from_branch}`, { headers })

  if (!ref.ok) throw new Error(`${ref.status} ${await ref.text()}`)

  const { object } = (await ref.json()) as { object: { sha: string } }

  const response = await fetch(`${base}/git/refs`, {

    method: "POST",

    headers: { ...headers, "Content-Type": "application/json" },

    body: JSON.stringify({ ref: `refs/heads/${branch}`, sha: object.sha }),

  })

  if (!response.ok) {

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

  }

  return await response.json()

}