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Current Path: Root / node_modules/ web-vitals/ dist/ modules/ lib

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Name	Size	Last Modified
[D]polyfills/	-	2022-10-08 17:28:27
[F]bindReporter.d.ts	218 bytes	2022-10-08 17:28:26
[F]bindReporter.js Edit	1.33 KB	2022-10-08 17:28:21
[F]generateUniqueID.d.ts	219 bytes	2022-10-08 17:28:26
[F]generateUniqueID.js Edit	884 bytes	2022-10-08 17:28:22
[F]getVisibilityWatcher.d.ts	92 bytes	2022-10-08 17:28:27
[F]getVisibilityWatcher.js Edit	2.16 KB	2022-10-08 17:28:24
[F]initMetric.d.ts	133 bytes	2022-10-08 17:28:27
[F]initMetric.js Edit	863 bytes	2022-10-08 17:28:24
[F]observe.d.ts	557 bytes	2022-10-08 17:28:27
[F]observe.js Edit	1.54 KB	2022-10-08 17:28:24
[F]onBFCacheRestore.d.ts	169 bytes	2022-10-08 17:28:27
[F]onBFCacheRestore.js Edit	764 bytes	2022-10-08 17:28:24
[F]onHidden.d.ts	155 bytes	2022-10-08 17:28:27
[F]onHidden.js Edit	1.22 KB	2022-10-08 17:28:24

Editing: observe.js

/*
 * Copyright 2020 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
 *
 *     https://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.
 */
/**
 * Takes a performance entry type and a callback function, and creates a
 * `PerformanceObserver` instance that will observe the specified entry type
 * with buffering enabled and call the callback _for each entry_.
 *
 * This function also feature-detects entry support and wraps the logic in a
 * try/catch to avoid errors in unsupporting browsers.
 */
export const observe = (type, callback) => {
    try {
        if (PerformanceObserver.supportedEntryTypes.includes(type)) {
            // More extensive feature detect needed for Firefox due to:
            // https://github.com/GoogleChrome/web-vitals/issues/142
            if (type === 'first-input' && !('PerformanceEventTiming' in self)) {
                return;
            }
            const po = new PerformanceObserver((l) => l.getEntries().map(callback));
            po.observe({ type, buffered: true });
            return po;
        }
    }
    catch (e) {
        // Do nothing.
    }
    return;
};

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