Function syncDependencies

packages/python/src/start-dev-server.ts:136–214

({
  workPath,
  uvPath,
  pythonBin,
  env,
  onStdout,
  onStderr,
}: DevPythonOptions)

}

async function syncDependencies({
  workPath,
  uvPath,
  pythonBin,
  env,
  onStdout,
  onStderr,
}: DevPythonOptions): Promise<void> {
  const pythonPackage = await discoverPackage({
    entrypointDir: workPath,
    rootDir: workPath,
  });

  const installInfo = detectInstallSource(pythonPackage, workPath);

  const { manifestType } = installInfo;
  let { manifestPath } = installInfo;
  const manifest = pythonPackage.manifest;

  if (!manifestType || !manifestPath) {
    debug('No Python project manifest found, skipping dependency sync');
    return;
  }

  // Store converted into manifest requirements, so we can run the sync
  if (manifest?.origin && manifestType === 'pyproject.toml') {
    const syncDir = join(workPath, '.vercel', 'python', 'sync');
    mkdirSync(syncDir, { recursive: true });
    const tempPyproject = join(syncDir, 'pyproject.toml');
    const content = stringifyManifest(manifest.data);
    writeFileSync(tempPyproject, content, 'utf8');
    manifestPath = tempPyproject;
    debug(
      `Wrote converted ${manifest.origin.kind} manifest to ${tempPyproject}`
    );
  }

  const writeOut = (msg: string) => {
    if (onStdout) {
      onStdout(Buffer.from(msg));
    } else {
      process.stdout.write(msg);
    }
  };

  const writeErr = (msg: string) => {
    if (onStderr) {
      onStderr(Buffer.from(msg));
    } else {
      process.stderr.write(msg);
    }
  };

  // Silence the output, but capture it for failures
  const captured: Array<['stdout' | 'stderr', Buffer]> = [];

  try {
    await runSync({