Function detectDefaultTrunkBranch

src/node/git.ts:82–106

(
  projectPath: string,
  branches?: string[]
)

const FALLBACK_TRUNK_CANDIDATES = ["main", "master", "trunk", "develop", "default"];

export async function detectDefaultTrunkBranch(
  projectPath: string,
  branches?: string[]
): Promise<string> {
  const branchList = branches ?? (await listLocalBranches(projectPath));

  if (branchList.length === 0) {
    throw new Error(`No branches available in repository ${projectPath}`);
  }

  const branchSet = new Set(branchList);
  const currentBranch = await getCurrentBranch(projectPath);

  if (currentBranch && branchSet.has(currentBranch)) {
    return currentBranch;
  }

  for (const candidate of FALLBACK_TRUNK_CANDIDATES) {
    if (branchSet.has(candidate)) {
      return candidate;
    }
  }

  return branchList[0];
}

export async function createWorktree(
  config: Config,