/**
 * @license
 * 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
 *
 *   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 const SDK_VERSION: string;
/** The prefix for start User Timing marks used for creating Traces. */
export declare const TRACE_START_MARK_PREFIX = "FB-PERF-TRACE-START";
/** The prefix for stop User Timing marks used for creating Traces. */
export declare const TRACE_STOP_MARK_PREFIX = "FB-PERF-TRACE-STOP";
/** The prefix for User Timing measure used for creating Traces. */
export declare const TRACE_MEASURE_PREFIX = "FB-PERF-TRACE-MEASURE";
/** The prefix for out of the box page load Trace name. */
export declare const OOB_TRACE_PAGE_LOAD_PREFIX = "_wt_";
export declare const FIRST_PAINT_COUNTER_NAME = "_fp";
export declare const FIRST_CONTENTFUL_PAINT_COUNTER_NAME = "_fcp";
export declare const FIRST_INPUT_DELAY_COUNTER_NAME = "_fid";
export declare const CONFIG_LOCAL_STORAGE_KEY = "@firebase/performance/config";
export declare const CONFIG_EXPIRY_LOCAL_STORAGE_KEY = "@firebase/performance/configexpire";
export declare const SERVICE = "performance";
export declare const SERVICE_NAME = "Performance";