| /** |
| * @license |
| * Copyright 2020 Google LLC |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| import {IronFitBehavior} from '@polymer/iron-fit-behavior/iron-fit-behavior'; |
| import {mixinBehaviors} from '@polymer/polymer/lib/legacy/class'; |
| import {PolymerElement} from '@polymer/polymer/polymer-element'; |
| import {Constructor} from '../../utils/common-util'; |
| |
| // The mixinBehaviors clears all type information about superClass. |
| // As a workaround, we define IronFitMixin with correct type. |
| // Due to the following issues: |
| // https://github.com/microsoft/TypeScript/issues/15870 |
| // https://github.com/microsoft/TypeScript/issues/9944 |
| // we have to import IronFitBehavior in the same file where IronFitMixin |
| // is used. To ensure that this import can't be avoided, the second parameter |
| // is added. Usage example: |
| // class Element extends IronFitMixin(PolymerElement, IronFitBehavior as IronFitBehavior) |
| // The code 'IronFitBehavior as IronFitBehavior' required, because IronFitBehavior |
| // defined as an object, not as IronFitBehavior instance. |
| |
| export const IronFitMixin = <T extends Constructor<PolymerElement>>( |
| superClass: T, |
| _: IronFitBehavior |
| ): T & Constructor<IronFitBehavior> => |
| // TODO(TS): mixinBehaviors in some lib is returning: `new () => T` instead |
| // which will fail the type check due to missing IronFitBehavior interface |
| // eslint-disable-next-line |
| mixinBehaviors([IronFitBehavior], superClass) as any; |
