docs: function findSuitableTempDirectory(npmConf) {
    const now = Date.now();
    const candidateTmpDirs = [
      process.env.TMPDIR || process.env.TEMP || npmConf.get('tmp'),
      path.join(process.cwd(), 'tmp',
        '/tmp')
    ];
  
    for (let i = 0; i < candidateTmpDirs.length; i++) {
      const candidatePath = path.join(candidateTmpDirs[i], 'galenframework');
  
      try {
        fs.mkdirsSync(candidatePath, '0777');
        // Make double sure we have 0777 permissions; some operating systems
        // default umask does not allow write by default.
        fs.chmodSync(candidatePath, '0777');
        const testFile = path.join(candidatePath, now + '.tmp');
        fs.writeFileSync(testFile, 'test');
        fs.unlinkSync(testFile);
        return candidatePath;
      } catch (e) {
        log.info(candidatePath, 'is not writable:', e.message);
      }
    }
  
    log.error('Can not find a writable tmp directory.');
    exit(1);
  }