bootstrap less grunt not working

Question

我似乎无法使用我的gruntfile从bootstrap编译我的较少文件，这是我的gruntfile：

module.exports = function(grunt) {

  // Configuration goes here
  grunt.initConfig({
       less: {
        options: {
            paths: ["public/bower_components/bootstrap/less"]       
        },
        files: {
            "public/css/bootstrap.css" : "public/bower_components/bootstrap/less/bootstrap.less"
        }   
      } 
  });

  // Load plugins here
  grunt.loadNpmTasks("grunt-contrib");
  grunt.loadNpmTasks("grunt-contrib-less");

  // Define your tasks here

};

当我运行grunt less时，我得到了

Running "less:files" (less) task
Done, without errors.

Bootstrap有它自己的bru文件，它的bower安装，我不认为它会导致某种冲突？我已经三次检查了我的路径并且它们很好。

编辑：我的文件夹结构：

由于

Answer 1

我的grunt less配置包含开发和生产目标的块。这有用吗？

module.exports = function(grunt) {

  // Configuration goes here
  grunt.initConfig({
   less: {
      development: {
        options: {
            paths: ["public/bower_components/bootstrap/less"]       
        },
        files: {
            "public/css/bootstrap.css" : "public/bower_components/bootstrap/less/bootstrap.less"
        }   
      } 
    }
  });

  // Load plugins here
  grunt.loadNpmTasks("grunt-contrib");
  grunt.loadNpmTasks("grunt-contrib-less");

  // Define your tasks here

};