Function exitHandler

packages/cli-v3/src/commands/update.ts:167–171

(sig: any)

  await writeJSONFile(packageJsonBackupPath, readonlyPackageJson, true);

  const exitHandler = async (sig: any) => {
    log.warn(
      `You may have to manually roll back any package.json changes. Backup written to ${packageJsonBackupPath}`
    );
  };

  // Add exit handler to warn about manual rollback of package.json
  // Automatically rolling back can end up overwriting with an empty file instead