voluptasmollitia/packages/util/src/compat.ts

Monorepo for the Firebase JavaScript SDK

/**
 * @license
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

export interface Compat<T> {
  _delegate: T;
}

export function getModularInstance<ExpService>(
  service: Compat<ExpService> | ExpService
): ExpService {
  if (service && (service as Compat<ExpService>)._delegate) {
    return (service as Compat<ExpService>)._delegate;
  } else {
    return service as ExpService;
  }
}