export async function main()

in eng/tools/typespec-validation/src/index.ts [12:71]
52 lines of code
10 McCabe index (conditional complexity)

export async function main() {
  const host = new TsvRunnerHost();
  const args = process.argv.slice(2);
  const options = {
    folder: {
      type: "string",
      short: "f",
    },
  };
  const parsedArgs = parseArgs({ args, options, allowPositionals: true } as ParseArgsConfig);
  const folder = parsedArgs.positionals[0];
  const absolutePath = host.normalizePath(folder);

  if (!(await host.checkFileExists(absolutePath))) {
    console.log(`Folder ${absolutePath} does not exist`);
    process.exit(1);
  }
  if (!(await host.isDirectory(absolutePath))) {
    console.log(`Please run TypeSpec Validation on a directory path`);
    process.exit(1);
  }
  console.log("Running TypeSpecValidation on folder: ", absolutePath);

  const suppressions: Suppression[] = await getSuppressions("TypeSpecValidation", absolutePath);
  if (suppressions && suppressions[0]) {
    // Use reason from first matching suppression and ignore rest
    console.log(`  Suppressed: ${suppressions[0].reason}`);
    return;
  }

  const rules = [
    new FolderStructureRule(),
    new NpmPrefixRule(),
    new EmitAutorestRule(),
    new FlavorAzureRule(),
    new LinterRulesetRule(),
    new CompileRule(),
    new FormatRule(),
  ];
  let success = true;
  for (let i = 0; i < rules.length; i++) {
    const rule = rules[i];
    console.log("\nExecuting rule: " + rule.name);
    const result = await rule.execute(host, absolutePath);
    if (result.stdOutput) console.log(result.stdOutput);
    if (!result.success) {
      success = false;
      console.log("Rule " + rule.name + " failed");
      if (result.errorOutput) console.log(result.errorOutput);

      // Stop executing more rules, since the results are more likely to be confusing than helpful
      // Can add property like "RuleResult.ContinueOnError" if some rules want to continue
      break;
    }
  }

  if (!success) {
    process.exitCode = 1;
  }
}