code: function(next) {
              if (!inNativeApp) return next(null, false, null, null, null);
              if (resourceIsBinary(filePath)) {
                var fullPath = shared.removeUrlMultislashes(fileFullPathRoot + '/' + filePath),
                    xhr;
                xhr = new XMLHttpRequest();
                xhr.open("GET", cacheUrl, true);
                xhr.responseType = "blob";
                xhr.onload = function(e) {
                  next(null, true, fullPath, xhr.response, null);
                };
                xhr.onerror = function(e) {
                  next(null, false)
                }
                xhr.send(null);
              } else {
                ajax(cacheUrl, null, compileData, function(err, data, compiled) {
                  next(null, !err, null, data, compiled);
                });
              }
            }
docs: try to retrieve from cache seed