grunt 運(yùn)行babel 總是報(bào)錯(cuò),scss轉(zhuǎn)css可以成功,求各位哥哥指教

gruntfile.js

module.exports = function (grunt) {

// Project configuration.
grunt.initConfig({
    //Read the package.json (optional)
    pkg: grunt.file.readJSON('package.json'),
    // Metadata.
    meta: {
        srcJsPath: './static/js/',
        srcSassPath: './static/css/',
        srcImgPath: './static/images/',
        distPath: './static/dist/'
    },
    //babel
    babel: {
        options: {
            sourceMap: true,
            presets: ['env']
        },
        dist: {
            files: [{
                expand:true,
                cwd:'static/js/', //js目錄下
                src: '*.js', //所有js文件
                dest:'static/dist/'  //輸出到此目錄下
            }]
        }
    },
    // sass
    sass: {
        dist: {
            options: {
                style: 'compressed',
                sourcemap: 'none'
            },
            files: [
                {'<%= meta.distPath %>nav_list.css': '<%= meta.srcSassPath %>nav_list.scss'},
            ]
        }
    },
    watch: {
        build: {
            files: [
                '<%= meta.srcJsPath %>*.js', '<%= meta.srcSassPath %>*.scss',
            ],
            tasks: ['sass']
        }
    }
});
grunt.loadNpmTasks('grunt-babel');
grunt.loadNpmTasks('grunt-contrib-sass');
grunt.loadNpmTasks('grunt-contrib-watch');

// 默認(rèn)被執(zhí)行的任務(wù)列表。
grunt.registerTask('default', ['sass', 'babel', 'watch']);

};

項(xiàng)目目錄是這樣的

運(yùn)行g(shù)runt 總報(bào)錯(cuò)

scss可以轉(zhuǎn)換成功，es6轉(zhuǎn)es5不能成功