material-motion/dist/operators/merge.js

Makes it easy to add rich, interactive motion to your application.

/** @license
 *  Copyright 2016 - present The Material Motion Authors. All Rights Reserved.
 *
 *  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.
 */
import { MotionObservable, } from '../observables/proxies';
import { isDefined, } from '../typeGuards';
export function withMerge(superclass) {
    return class extends superclass {
        merge({ others }) {
            if (!isDefined(others)) {
                others = arguments[0];
            }
            return new MotionObservable((observer) => {
                const subscriptions = [this, ...others].map(stream => stream.subscribe(observer));
                return () => {
                    subscriptions.forEach(subscription => subscription.unsubscribe());
                };
            });
        }
    };
}
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