javascript - polymer 构建 : Warning [unknown-superclass] - Unable to resolve superclass superClass

Question

尝试构建我的 Polymer 2.0 项目，但每次我尝试时，无论预设(es5-bundled、es6-bundled)还是单独的标志，我都会收到以下针对我拥有的一个 mixin 的警告:

EdmMac: public vedtam$ polymer build
info:    Clearing build/ directory...
info:    (default) Building...

    const DatastoreMixin = (superClass) => class extends superClass {
                                                         ~~~~~~~~~~
src/mixins/datastore-mixin.html(1,57) warning [unknown-superclass] - Unable to resolve superclass superClass
info:    (default) Build complete!

构建对象:

  "builds": [{
    "name": "default",
    "bundle": true,
    "js": {"compile": true},
    "css": {"minify": true},
    "html": {"minify": true},
    "addServiceWorker": true
  }]

调用者:app-main.html:

class MyApp extends Polymer.GestureEventListeners(DatastoreMixin(ReduxMixin(Polymer.Element))) {

数据存储混合器:

<script>
    DatastoreMixin = function(superClass) {
      return class extends superClass {
        constructor() {
          super();
        }

        static get properties() {
          return {
            bar: {
              type: Object
            }
          };
        }

      }
    }
</script>

版本与环境

• Polymer CLI:1.1.0
  
• 节点:v6.10.3
  
• 操作系统:OSX 10.10.5
  

有什么问题吗？

Answer 1

如果有人遇到同样的问题，我从 Polymer 开发人员那里得到了答案，作为修复你需要使用 /* @polymerMixin */ 注释:

<script>
    /* @polymerMixin */
    DatastoreMixin = function(superClass) {
      return class extends superClass {
        constructor() {
          super();
        }

        static get properties() {
          return {
            bar: {
              type: Object
            }
          };
        }

      }
    }
</script>