(result) => {
          if (!this.firstResult) {
            this.firstResult = result;
          }

          printSlowTrees(result.graph);
          writeBuildLog(result, name);
        },

      .then(function(hash) {
        console.log('=== Stats for %s (total: %ds) ===', outputRoot,
                    Math.round(hash.totalTime / 1000000) / 1000);
        printSlowTrees(hash.graph);

        var dir = hash.directory;
        try {
          time('Write build output', function() {
            copyDereferenceSync(path.join(dir, outputRoot), distPath);
          });
        } catch (err) {
          if (err.code === 'EEXIST') err.message += ' (we cannot build into an existing directory)';
          throw err;
        }
      })

 .then((result) => {
     printSlowTrees(result.graph);
 })

 return builder.build().then((result) => { printSlowTrees(result.graph); });