@custom-elements-manifest/analyzer/fixtures/02-inheritance/02-mixins/package/ModuleMixin.js

<!-- [=> See Source <=](../../docs/analyzer/index.md) -->

export const ModuleMixin = klass => class extends klass {
  moduleMixinField;
  static observedAttributes = [...super.observedAttributes, 'moduleMixin-attr'];
  moduleMixinMethod() {
    this.dispatchEvent(new Event('moduleMixin-event'))
  }
}