async function setup() {
  if (process.env.CI) return;

  process.env.DEVTOOLS_PATH = devtoolsDir;
  execFileSync('bash',
    ['core/test/devtools-tests/download-devtools.sh'],
    {stdio: 'inherit'}
  );
  execFileSync('bash',
    ['core/test/devtools-tests/roll-devtools.sh'],
    {stdio: 'inherit'}
  );
}
Download/pull latest DevTools, build Lighthouse for DevTools, roll to DevTools, and build DevTools.