How to Hash css classes for production ?

build: {
    /*
    ** You can extend webpack config here
    */      
    loaders: {
      cssModules: {
        modules: {
          localIdentName: "[local]--[Frida]_[hash:base64:4]",
        }
      }
    },
  },

build: {
    /*
    ** You can extend webpack config here
    */      
    loaders: {
      cssModules: {
        modules: {
          localIdentName: "[local]--[Frida]_[hash:base64:4]",
        }
      }
    },
  },