export async function resolveEntrypoint()

in packages/apps/autorest/src/autorest-as-a-service.ts [82:144]
52 lines of code
23 McCabe index (conditional complexity)

export async function resolveEntrypoint(localPath: string, entrypoint: string): Promise<string | undefined> {
  try {
    // did they specify the package directory directly
    if (await isDirectory(localPath)) {
      // eslint-disable-next-line @typescript-eslint/no-var-requires
      const pkg = nodeRequire(`${localPath}/package.json`);
      if (pkg.name === "autorest") {
        // you've tried loading the bootstrapper not the core!
        console.error(`The location you have specified is not autorest-core, it's autorest bootstrapper: ${pkg.name}`);
        process.exit(1);
      }

      if (args.debug) {
        console.log(`Examining AutoRest core package: ${pkg.name}`);
      }

      if (pkg.name === oldCorePackage || pkg.name === newCorePackage) {
        if (args.debug) {
          console.log("Looks like a core package.");
        }
        switch (entrypoint) {
          case "main":
          case "main.js":
            entrypoint = pkg.main;
            break;

          case "language-service":
          case "language-service.js":
          case "autorest-language-service":
            entrypoint = pkg.bin["autorest-language-service"];
            break;

          case "autorest":
          case "autorest-core":
          case "app.js":
          case "app":
            entrypoint = pkg.bin["autorest-core"] || pkg.bin["core"];
            break;

          case "module":
            // special case: look for the main entrypoint
            // but return the module folder
            if (await isFile(`${localPath}/${pkg.main}`)) {
              if (args.debug) {
                console.log(`special case: '${localPath}/${pkg.main}' .`);
              }
              return localPath.replace(/\\/g, "/");
            }
        }
        const path = `${localPath}/${entrypoint}`;
        if (await isFile(path)) {
          if (args.debug) {
            console.log(`Using Entrypoint: '${localPath}/${entrypoint}' .`);
          }
          return path.replace(/\\/g, "/");
        }
      }
    }
  } catch {
    // no worries
  }
  return undefined;
}