grunt file

/*
 After you have changed the settings at "Your code goes here",
 run this with one of these options:
  "grunt" alone creates a new, completed images directory
  "grunt clean" removes the images directory
  "grunt responsive_images" re-processes images without removing the old ones
*/

module.exports = function(grunt) {

  grunt.initConfig({
    responsive_images: {
      dev: {
        options: {
          engine: 'im',
          sizes: [{
            /*
            Change these:
            
            width: ,
            suffix: ,
            quality:
            */
          }]
        },

        /*
        You don't need to change this part if you don't change
        the directory structure.
        */
        files: [{
          expand: true,
          src: ['*.{gif,jpg,png}'],
          cwd: 'images_src/',
          dest: 'images/'
        }]
      }
    },

    /* Clear out the images directory if it exists */
    clean: {
      dev: {
        src: ['images'],
      },
    },

    /* Generate the images directory if it is missing */
    mkdir: {
      dev: {
        options: {
          create: ['images']
        },
      },
    },

    /* Copy the "fixed" images that don't go through processing into the images/directory */
    copy: {
      dev: {
        files: [{
          expand: true,
          src: 'images_src/fixed/*.{gif,jpg,png}',
          dest: 'images/'
        }]
      },
    },
  });
  
  grunt.loadNpmTasks('grunt-responsive-images');
  grunt.loadNpmTasks('grunt-contrib-clean');
  grunt.loadNpmTasks('grunt-contrib-copy');
  grunt.loadNpmTasks('grunt-mkdir');
  grunt.registerTask('default', ['clean', 'mkdir', 'copy', 'responsive_images']);

};

https://unicode-table.com/en/

grunt

module.exports = function(grunt){
 // config
grunt.initConfig({

    pkg: grunt.file.readJSON('package.json'),

    less: {
      build1:{
        src: ['src/styles1.less','src/styles2.less'],
        dest: 'build/styles.css'
      }
    },

    csslint: {
      check: {
        src: '<%= less.build.dest %>'
      }
    }

    cssmin: {
      minmize: {
        options: {
          banner: '/*! <%= pkg.name %> <%= grunt.template.today("yyyy-mm-dd") %> */'
        },
        files: {
          'build/styles.min.css' : '<%= less.build.dest %>'
        }
      }
    }

});

 // plugin
 grunt.loadNpmTasks('grunt-contrib-less');
 grunt.loadNpmTasks('grunt-contrib-csslint');
 grunt.loadNpmTasks('grunt-contrib-cssmin');

 // tasks
 grunt.registerTask('default', ['less', 'cssmin','csslint']);
}