docs: function cp(src, dist) {
        function copy(sr, di, isOnInit) {
          if (fs.existsSync(sr)) {
            var stat = fs.statSync(sr);
            if (stat.isFile()) {
              var wtStream = fs.createWriteStream(di);
              fs.createReadStream(sr).pipe(wtStream);
            }
            else if (stat.isDirectory()) {
              if (isOnInit) {
                di = path.join(di, path.basename(sr));
              }
              mk(di);
              var subSrcs = fs.readdirSync(sr);
              subSrcs.forEach(function (file) {
                var subSrc = path.join(sr, file);
                var subDist = path.join(di, file);
                copy(subSrc, subDist, false);
              });
            }
          }
        }
        return copy(src, dist, true);
      }