/**
 * Copyright 2020, SumUp Ltd.
 * 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 interface IPerformanceEntry extends PerformanceEntry {
    entryType: string;
    name: string;
    duration: number;
    startTime: number;
}
export interface IPerformanceEventTiming extends IPerformanceEntry {
    processingStart: DOMHighResTimeStamp;
}
export interface ILayoutShift extends IPerformanceEntry {
    value: number;
    hadRecentInput: boolean;
}
export interface IPerformanceElementTiming extends IPerformanceEntry {
    identifier: string;
}
export declare type IMetricName = 'first-contentful-paint' | 'first-paint' | 'first-input-delay' | 'largest-contentful-paint' | 'cumulative-layout-shift' | 'time-to-first-byte' | 'element-timing' | 'navigation-timing' | 'resource-timing' | 'user-timing' | 'longtask';
export declare type IEntryType = 'first-input' | 'measure' | 'element' | 'navigation' | 'paint' | 'largest-contentful-paint' | 'layout-shift' | 'resource' | 'longtask';
export declare type IPerformanceObservers = {
    [key in IMetricName]?: PerformanceObserver;
};
export declare type IMetricNameToEntryTypeMap = {
    [key in IMetricName]: IEntryType;
};
export interface IMetric {
    name: string;
    value: number;
    meta: {
        entryType: IEntryType;
        entries: IPerformanceEntry[];
        url?: string;
        createdAt: number;
        updatedAt?: number;
    };
}
export interface IMetricCallback {
    (metric: IMetric): void;
}
export interface IMetricHistory {
    [index: number]: IMetric;
    push(metric: IMetric): void;
}
export interface IEntryHandler {
    (entry: PerformanceEntry): void;
}
export interface IMetricReporter {
    (entryType: IEntryType, metricName: IMetricName, reportMetric: IMetricCallback, reportAllChanges?: boolean): PerformanceObserver | undefined;
}
export interface IObserveMethod {
    (metricName: IMetricName, callback: IMetricCallback, reportAllChanges?: boolean): PerformanceObserver | undefined;
}
export interface IObserveAllMethod {
    (metricNames: IMetricName[], callback: IMetricCallback, reportAllChanges?: boolean): void;
}
export interface IDisconnectMethod {
    (metricName: IMetricName): void;
}
export interface IDisconnectAllMethod {
    (metricNames?: IMetricName[]): void;
}