Method _setParent

packages/runtime-dom/src/apiCustomElement.ts:325–330

(parent = this._parent)

  }

  private _setParent(parent = this._parent) {
    if (parent) {
      this._instance!.parent = parent._instance
      this._inheritParentContext(parent)
    }
  }

  private _inheritParentContext(parent = this._parent) {
    // #13212, the provides object of the app context must inherit the provides