code: function findModule(host, generateDir) {
      let dir = host.getDir('/' + generateDir);
      const moduleRe = /\.module\.ts$/;
      const routingModuleRe = /-routing\.module\.ts/;
      while (dir) {
          const matches = dir.subfiles.filter(p => moduleRe.test(p) && !routingModuleRe.test(p));
          if (matches.length == 1) {
              return core_1.join(dir.path, matches[0]);
          }
          else if (matches.length > 1) {
              throw new Error('More than one module matches. Use skip-import option to skip importing '
                  + 'the component into the closest module.');
          }
          dir = dir.parent;
      }
      throw new Error('Could not find an NgModule for the new component. Use the skip-import '
          + 'option to skip importing components in NgModule.');
  }
docs: Function to find the "closest" module to a generated file's path.