code: function symlinkDependencies(pkg) {
        let name = pkg.name;
        let modulesPath = path.join(outputPath, name, 'node_modules');
        let dependencies = pkg.internalDependencies;
  
        // @glimmer/test-helpers has some tricky circular dependencies so we manually
        // link it into every package locally.
        if (name !== '@glimmer/test-helpers') {
          dependencies.push('@glimmer/test-helpers');
        }
  
        dependencies.forEach(dep => {
          if (isScopedPackage(dep)) { mkdirpScope(dep, modulesPath); }
          fs.symlinkSync(
            path.join('../../../../', dep),
            path.join(modulesPath, dep)
          );
        });
      }
docs: For a given package, enumerate its internal dependencies (other packages in the repo) and symlink them into the appropriate spot in `node_modules`.