Function startDevServer

packages/go/src/index.ts:926–1071

(
  opts: StartDevServerOptions
)

}

export async function startDevServer(
  opts: StartDevServerOptions
): Promise<StartDevServerResult> {
  const { entrypoint, workPath, config, meta = {} } = opts;
  const { devCacheDir = join(workPath, '.vercel', 'cache') } = meta;

  // For some reason, if `entrypoint` is a path segment (filename contains `[]`
  // brackets) then the `.go` suffix on the entrypoint is missing. Fix that here…
  let entrypointWithExt = entrypoint;
  if (!entrypoint.endsWith('.go')) {
    entrypointWithExt += '.go';
  }

  // Standalone server mode when framework is 'go' or 'services'
  if (config?.framework === 'go' || config?.framework === 'services') {
    const resolvedEntrypoint = await detectGoEntrypoint(
      workPath,
      entrypointWithExt
    );
    if (!resolvedEntrypoint) {
      throw new Error(
        `No Go entrypoint found. Expected one of: ${GO_CANDIDATE_ENTRYPOINTS.join(', ')}`
      );
    }
    return startStandaloneDevServer(opts, resolvedEntrypoint);
  }

  const entrypointDir = dirname(entrypointWithExt);
  const tmp = join(devCacheDir, 'go', Math.random().toString(32).substring(2));
  const tmpPackage = join(tmp, entrypointDir);
  await mkdirp(tmpPackage);

  const { goModPath } = await findGoModPath(
    join(workPath, entrypointDir),
    workPath
  );
  const modulePath = goModPath ? dirname(goModPath) : undefined;
  const analyzed = await getAnalyzedEntrypoint({
    entrypoint: entrypointWithExt,
    modulePath,
    workPath,
  });

  await Promise.all([
    copyEntrypoint(entrypointWithExt, tmpPackage),
    copyDevServer(analyzed.functionName, tmpPackage),
    writeGoMod({
      destDir: tmp,
      goModPath,
      packageName: analyzed.packageName,
    }),
    writeGoWork(tmp, workPath, modulePath),
  ]);

  const portFile = join(
    TMP,
    `vercel-dev-port-${Math.random().toString(32).substring(2)}`
  );