问ESlint编译es6导入/导出语句失败

EN

class HeaderController {

    constructor($rootScope, $scope) {
        this.$rootScope = $rootScope;
        this.$scope = $scope;
    }

    changeNavItem(selectedTab) {
        this.activeNavItem = selectedTab;
    }

    init() {
        this.activeNavItem = 'All';
    } }

HeaderController.$inject = ['$rootScope', '$scope'];

angular.module('app')
    .controller('HeaderController', HeaderController);

export default HeaderController; // fails on this line

"parserOptions": {
        "ecmaVersion": 6,
        "sourceType": "module",
        "allowImportExportEverywhere": true,
        "ecmaFeatures": {
            "modules": true,
            "arrowFunctions": true,
            "classes": true
        }
    }