grunt-babel中的静态关键字抛出错误

我试图在babeljs的试用标签中反汇编以下代码-

    class aboutController{
      constructor(ajaxService){
        this.ajaxService = ajaxService;
        this.printLog();
      }

      printLog(){
        this.ajaxService.log();
      }

      static $inject = ["ajaxService"];
    }

将static关键字转译为

{
  key: "$inject",
  value: ["ajaxService"],
  enumerable: true
}

然后，我尝试了grunt-babel任务来自动化构建。我的gruntfile.js看起来像这样-

module.exports = function(grunt){
grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),
    babel: {
        options: {
            sourceMap: true,
            highlightCode: true
        },
        es6: {
            files: [
                {
                    expand: true,
                    src: ['components/**/*.es6'],
                    ext: '.js'
                }
            ]
        }
    },
    watch: {
        scripts: {
            files: ['components/**/*.es6'],
            tasks:['babel']
        }
    }
});

require("load-grunt-tasks")(grunt);
grunt.registerTask("default", ["babel", "watch"]);
}

但是现在static关键字给出了错误，当我删除static关键字时，构建正在通过。任何想法如何解决此问题。咕bab巴贝过时了吗？

这是我的packahe.json的样子-

{
"name": "babeles6",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
},
"author": "",
"license": "ISC",
"devDependencies": {
    "grunt": "~0.4.2",
    "grunt-babel": "^5.0.1",
    "grunt-contrib-watch": "^0.6.1",
    "load-grunt-tasks": "^3.2.0"
}
}