src/services/getEntries.ts

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 function getNavigationEntry() {
  const navigationEntry: PerformanceEntry | any =
    self.performance &&
    performance.getEntriesByType &&
    performance.getEntriesByType('navigation')[0];

  if (
    navigationEntry &&
    navigationEntry.responseStart > 0 &&
    navigationEntry.responseStart < performance.now()
  ) {
    return navigationEntry;
  }
};


export function getActivationStart() {
  const entry = getNavigationEntry();
  return (entry && entry.activationStart) || 0;
};

export function getResourceEntry() {
  const resourceEntry: PerformanceEntry | any =
    self.performance &&
    performance.getEntriesByType &&
    performance.getEntriesByType('resource');
    return resourceEntry;
};