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website/functions/node_modules/@firebase/util/dist/src/subscribe.d.ts

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+/**
+ * Copyright 2017 Google Inc.
+ *
+ * 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 declare type NextFn<T> = (value: T) => void;
+export declare type ErrorFn = (error: Error) => void;
+export declare type CompleteFn = () => void;
+export interface Observer<T> {
+    next: NextFn<T>;
+    error: ErrorFn;
+    complete: CompleteFn;
+}
+export declare type PartialObserver<T> = Partial<Observer<T>>;
+export declare type Unsubscribe = () => void;
+/**
+ * The Subscribe interface has two forms - passing the inline function
+ * callbacks, or a object interface with callback properties.
+ */
+export interface Subscribe<T> {
+    (next?: NextFn<T>, error?: ErrorFn, complete?: CompleteFn): Unsubscribe;
+    (observer: PartialObserver<T>): Unsubscribe;
+}
+export interface Observable<T> {
+    subscribe: Subscribe<T>;
+}
+export declare type Executor<T> = (observer: Observer<T>) => void;
+/**
+ * Helper to make a Subscribe function (just like Promise helps make a
+ * Thenable).
+ *
+ * @param executor Function which can make calls to a single Observer
+ *     as a proxy.
+ * @param onNoObservers Callback when count of Observers goes to zero.
+ */
+export declare function createSubscribe<T>(executor: Executor<T>, onNoObservers?: Executor<T>): Subscribe<T>;
+/** Turn synchronous function into one called asynchronously. */
+export declare function async(fn: Function, onError?: ErrorFn): Function;