Function createChannelReleasePr

packages/bumpy/src/commands/ci.ts:1053–1164

* Create or update the channel's release PR. Unlike the stable version PR, its diff * is pure file moves (pending bump files → `.bumpy/ /`) — no versions, no * changelogs. The PR title/body show targets with a wildcard counter (`1.2.0-rc.x`), * derived purely from committed state; the exa

(
  rootDir: string,
  config: BumpyConfig,
  channel: ResolvedChannel,
  packages: Map<string, import('../types.ts').WorkspacePackage>,
  branchOverride?: string,
)

  // Step 1: publish if this push merged a release PR (moved files into the channel dir)
  const movedIds = detectChannelMoves(rootDir, channel);
  const shouldPublish = movedIds.length > 0 && opts.assertMode !== 'version-pr';
  if (shouldPublish) {
    log.step(`Release PR merge detected (${movedIds.map((id) => `${id}.md`).join(', ')}) — publishing prereleases...`);
    const { publishCommand } = await import('./publish.ts');
    await publishCommand(rootDir, { channel: channel.name, tag: opts.tag });
  }

  if (opts.assertMode === 'publish') {
    if (!shouldPublish) {
      throw new Error(
        'Expected mode "publish" but this push did not move bump files into the channel dir. ' +
          'Either remove --expect-mode, or gate this step on the output of "bumpy ci plan".',
      );
    }
    return;
  }

  // Step 2: create/update the release PR for pending bump files
  if (pending.length > 0) {
    await createChannelReleasePr(rootDir, config, channel, packages, opts.branch);
  } else if (!shouldPublish) {
    log.info(`Nothing to do on channel "${channel.name}" — no pending bump files, no release PR merge in this push.`);
  }
}

/**
 * Create or update the channel's release PR. Unlike the stable version PR, its diff
 * is pure file moves (pending bump files → `.bumpy/<channel>/`) — no versions, no
 * changelogs. The PR title/body show targets with a wildcard counter (`1.2.0-rc.x`),
 * derived purely from committed state; the exact counter is assigned at publish time.
 */
async function createChannelReleasePr(
  rootDir: string,
  config: BumpyConfig,
  channel: ResolvedChannel,
  packages: Map<string, import('../types.ts').WorkspacePackage>,
  branchOverride?: string,
): Promise<void> {
  const branch = validateBranchName(branchOverride || channel.versionPr.branch);
  const baseBranch = validateBranchName(channel.branch);

  // Check if a release PR already exists
  const existingPr = tryRunArgs(['gh', 'pr', 'list', '--head', branch, '--json', 'number', '--jq', '.[0].number'], {
    cwd: rootDir,
  });

  log.step(`Creating branch ${branch}...`);
  const branchExists = tryRunArgs(['git', 'rev-parse', '--verify', branch], { cwd: rootDir }) !== null;
  if (branchExists) {
    runArgs(['git', 'checkout', branch], { cwd: rootDir });
    runArgs(['git', 'reset', '--hard', baseBranch], { cwd: rootDir });
  } else {
    runArgs(['git', 'checkout', '-b', branch], { cwd: rootDir });
  }

  // Move pending bump files into the channel dir (the entire "version" step for a channel)
  const { channelVersion } = await import('./version.ts');