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Checklist
npm test
passesAffected core subsystem(s)
Description of change
将 IHelper 改成继承 BaseContextClass ,在写 helper 的 extend 的时候,将 this type 指定为 IHelper 才能拿到
this.ctx
,顺便将 BaseContextClass 里的 ctx、app 等改成 protected ,在外部使用的时候就不会出现这些干扰类型。