Function build

packages/next/src/index.ts:214–3006

}

export const build: BuildV2 = async buildOptions => {
  let { workPath, repoRootPath } = buildOptions;
  const builderSpan = buildOptions.span ?? new Span({ name: 'vc.builder' });

  const {
    files,
    entrypoint,
    config = {},
    meta = {},
    buildCallback,
  } = buildOptions;

  validateEntrypoint(entrypoint);

  let entryDirectory = path.dirname(entrypoint);
  let entryPath = path.join(workPath, entryDirectory);

  // allow testing root directory setting with vercel.json
  if (config.rootDirectory) {
    repoRootPath = entryPath;
    entryPath = path.join(entryPath, config.rootDirectory as string);
  }
  const outputDirectory = path.join('./', config.outputDirectory || '.next');
  const dotNextStatic = path.join(entryPath, outputDirectory, 'static');
  // TODO: remove after testing used for simulating root directory monorepo
  // setting that can't be triggered with vercel.json
  const baseDir = repoRootPath || workPath;

  debug(
    JSON.stringify(
      {
        repoRootPath,
        baseDir,
        workPath,
        entryPath,
        entryDirectory,
        outputDirectory,
      },
      null,
      2
    )
  );

  const prefixedEnvs = getPrefixedEnvVars({
    envPrefix: 'NEXT_PUBLIC_',
    envs: process.env,
  });

  for (const [key, value] of Object.entries(prefixedEnvs)) {
    process.env[key] = value;
  }

  await download(files, workPath, meta);

  if (config.rootDirectory) {
    // this must come after the download step since files outside
    // the root directory will be excluded if we update workPath first.
    // This should not be used when the actual root directory setting