Function installInjectedPackage

packages/python/src/index.ts:445–481

* Install a Vercel-owned Python package into the build venv, resolving the * source in this order: env override → in-repo source (if present) → pinned * PyPI version. The in-repo branch lets monorepo `vercel build` runs (e.g. CI * on a Version Packages PR) avoid PyPI for a version that does not e

({
  name,
  pinned,
  envOverride,
  uv,
  venvPath,
  projectDir,
  pipPlatformArgs,
}: {
  name: 'vercel-runtime' | 'vercel-workers';
  pinned: string;
  envOverride: string | undefined;
  uv: UvRunner;
  venvPath: string;
  projectDir: string;
  pipPlatformArgs: string[];
})

 * on a Version Packages PR) avoid PyPI for a version that does not exist yet.
 */
async function installInjectedPackage({
  name,
  pinned,
  envOverride,
  uv,
  venvPath,
  projectDir,
  pipPlatformArgs,
}: {
  name: 'vercel-runtime' | 'vercel-workers';
  pinned: string;
  envOverride: string | undefined;
  uv: UvRunner;
  venvPath: string;
  projectDir: string;
  pipPlatformArgs: string[];
}): Promise<void> {
  const localDir = join(__dirname, '..', '..', '..', 'python', name);
  const isLocalDev = fs.existsSync(join(localDir, 'pyproject.toml'));
  const dep = envOverride || (isLocalDev ? localDir : pinned);
  // override exclude-newer, since we want vercel-runtime updates to
  // take effect immediately after release
  const noExclude = ['--exclude-newer-package', `${name}=false`];
  debug(`Installing ${dep}`);
  await uv.pip({
    venvPath,
    projectDir,
    args: [
      'install',
      '--link-mode',
      'copy',
      ...pipPlatformArgs,
      ...noExclude,
      dep,
    ],
  });
}

export const build: BuildVX = async ({
  workPath,