gistfile1.js

hash: {
      options: {
        mapping: 'public/assets.json',
        flatten: false,
        hashLength: 8,
        hashFunction: function(source, encoding) {
          return require('crypto').createHash('sha1').update(source, encoding).digest('hex');
        }
      },
      js: {
        options: {
          srcBasePath: 'public/js/',
          destBasePath: 'public/js/'
        },
        src: 'public/js/*.js',
        dest: 'public/js/'
      },
      css: {
        options: {
          srcBasePath: 'public/css/',
          destBasePath: 'public/css/'
        },
        src: 'public/css/*.css',
        dest: 'public/css/'
      }
    }