Function createBranch

src/utils/github.ts:222–265

(
  token: string,
  owner: string,
  repo: string,
  branchName: string,
  sha: string
)

}

export async function createBranch(
  token: string,
  owner: string,
  repo: string,
  branchName: string,
  sha: string
) {
  // First, try to delete the branch if it already exists (from a previous run)
  try {
    const checkRes = await ghFetch(
      `/repos/${owner}/${repo}/git/ref/heads/${encodeURIComponent(branchName)}`,
      token
    );
    if (checkRes.ok) {
      // Branch exists — delete it first
      await ghFetch(
        `/repos/${owner}/${repo}/git/refs/heads/${encodeURIComponent(branchName)}`,
        token,
        { method: 'DELETE' }
      );
      // Small delay to let GitHub process the deletion
      await sleep(500);
    }
  } catch {
    // Ignore errors during cleanup — branch might not exist
  }

  const res = await ghFetch(`/repos/${owner}/${repo}/git/refs`, token, {
    method: 'POST',
    body: JSON.stringify({ ref: `refs/heads/${branchName}`, sha }),
    headers: { 'Content-Type': 'application/json' },
  });
  if (!res.ok) {
    const err = await res.json().catch(() => ({ message: res.statusText }));
    if (res.status === 422 && err.message?.includes('Reference already exists'))
      throw new Error(`BRANCH_EXISTS: Branch '${branchName}' already exists. Could not auto-delete it — check permissions.`);
    if (res.status === 403 && err.message?.includes('Resource not accessible'))
      throw new Error(`PERMISSION_DENIED: ${err.message}`);
    if (res.status === 401)
      throw new Error(`PERMISSION_DENIED: Token expired or invalid (401 Unauthorized)`);
    throw new Error(`Failed to create branch: ${err.message || `HTTP ${res.status}`}`);
  }
  return res.json();
}

/**
 * Commit a single file to a branch using the low-level Git Data API.