Javascript 未解析升级的Angular 1 component指令的模板属性

我有以下1条指令：

return function(module) {
    module.directive('myButtonUpgrade', myButtonUpgrade);

    function myButtonUpgrade() {
        return {
            restrict: 'E',                
            template: template(),                
            scope: {
                image: '=',
                imageColour: '='
            }
        };

        function template() {
            var html = '<my-button visible="flipVisible"\
                            enabled="enabled"\
                            image="{{::image}}"\
                            image-colour="{{::imageColour}}"\
                       </my-button>';

            return html;
        }
    }

    return myButtonUpgrade;
};

“this.directive.template”-未解析模板参数

有什么想法吗

import { Component } from '@angular/core';
import { upgradeAdapter } from '../../../upgrade/index';

var myButtonEx = upgradeAdapter.upgradeNg1Component('myButtonUpgrade');

@Component({
    selector: 'my-button-ex',
    template: '<my-button-ex [image]="refresh"></my-button-ex>',
    directives: [myButtonEx] 
})
export class ButtonExComponent {        
}

upgrade_ng1_adapter.ts
compileTemplate(...){
   this.linkFn = compileHtml(this.directive.template);
}