/**
 * @typedef {'phone' | 'tablet' | 'desktop' | null} DeviceType
 * @typedef {'full' | 'lite' | null} DeviceMemory
 * @typedef {'slow-2g' | '2g' | '3g' | '4g' | null} EffectiveConnectionType
 *
 * @typedef {object} UserTiming
 * @prop {'mark' | 'measure'} type
 * @prop {string} name
 * @prop {number} startTime
 * @prop {number} [duration]
 *
 * @typedef {object} Resource
 * @prop {string} url
 * @prop {string} type
 * @prop {number} size
 * @prop {number} startTime
 * @prop {number} duration
 *
 * @typedef {object} LongTask
 * @prop {number} startTime
 * @prop {number} duration
 *
 * @typedef {object} UxmResult
 * @prop {DeviceType} deviceType
 * @prop {EffectiveConnectionType} effectiveConnectionType
 * @prop {number | null} timeToFirstByte
 * @prop {number | null} firstPaint
 * @prop {number | null} firstContentfulPaint
 * @prop {number | null} domContentLoaded
 * @prop {number | null} onLoad
 * @prop {string} [url]
 * @prop {string} [userAgent]
 * @prop {DeviceMemory | null} [deviceMemory]
 * @prop {UserTiming[] | null} [userTiming]
 * @prop {LongTask[] | null} [longTasks]
 * @prop {Resource[] | null} [resources]
 */
/**
 * Get all metrics.
 *
 * @param {{ all?: boolean, url?: boolean, userAgent?: boolean, deviceMemory?: boolean, userTiming?: boolean, longTasks?: boolean, resources?: boolean }} [opts]
 * @return {Promise<UxmResult>}
 */
export function uxm(opts?: {
    all?: boolean | undefined;
    url?: boolean | undefined;
    userAgent?: boolean | undefined;
    deviceMemory?: boolean | undefined;
    userTiming?: boolean | undefined;
    longTasks?: boolean | undefined;
    resources?: boolean | undefined;
} | undefined): Promise<UxmResult>;
/**
 * Create a custom performance mark with `markName` name.
 * https://developer.mozilla.org/en-US/docs/Web/API/Performance/mark
 *
 * @param {string} markName
 */
export function mark(markName: string): void;
/**
 * Create performance measurement `measureName` between marks, the navigation start time, or `startMarkName`.
 * https://developer.mozilla.org/en-US/docs/Web/API/Performance/measure
 *
 * @param {string} measureName
 * @param {string} [startMarkName]
 */
export function measure(measureName: string, startMarkName?: string | undefined): void;
/**
 * Get effective connection type.
 * https://developer.mozilla.org/en-US/docs/Web/API/NetworkInformation
 *
 * @return {EffectiveConnectionType}
 */
export function getEffectiveConnectionType(): "slow-2g" | "2g" | "3g" | "4g" | null;
/**
 * Get `first-paint` mark.
 *
 * @return {number | null}
 */
export function getFirstPaint(): number | null;
/**
 * Get `first-contentful-paint` mark.
 *
 * @return {number | null}
 */
export function getFirstContentfulPaint(): number | null;
/**
 * Get server response timestamp.
 *
 * @return {number | null}
 */
export function getTimeToFirstByte(): number | null;
/**
 * Get `DomContentLoaded` event timestamp.
 *
 * @return {number | null}
 */
export function getDomContentLoaded(): number | null;
/**
 * Get `load` event timestamp.
 *
 * @return {number | null}
 */
export function getOnLoad(): number | null;
/**
 * Get device type.
 * based on https://github.com/matthewhudson/current-device/blob/master/src/index.js
 *
 * @param {string} [ua]
 * @return {DeviceType}
 */
export function getDeviceType(ua?: string | undefined): "phone" | "tablet" | "desktop" | null;
/**
 * Get current url.
 *
 * @return {String}
 */
export function getUrl(): string;
/**
 * Get user-agent.
 *
 * @return {String}
 */
export function getUserAgent(): string;
/**
 * Get effective device memory.
 *
 * @return {DeviceMemory | null}
 */
export function getDeviceMemory(): "full" | "lite" | null;
/**
 * Get all user timings.
 *
 * @return {UserTiming[] | null}
 */
export function getUserTiming(): UserTiming[] | null;
/**
 * Get resources.
 *
 * @return {Resource[] | null}
 */
export function getResources(): Resource[] | null;
/**
 * Get collected long tasks.
 *
 * @return {LongTask[] | null}
 */
export function getLongTasks(): LongTask[] | null;
export type DeviceType = "phone" | "tablet" | "desktop" | null;
export type DeviceMemory = "full" | "lite" | null;
export type EffectiveConnectionType = "slow-2g" | "2g" | "3g" | "4g" | null;
export type UserTiming = {
    type: "mark" | "measure";
    name: string;
    startTime: number;
    duration?: number;
};
export type Resource = {
    url: string;
    type: string;
    size: number;
    startTime: number;
    duration: number;
};
export type LongTask = {
    startTime: number;
    duration: number;
};
export type UxmResult = {
    deviceType: "phone" | "tablet" | "desktop" | null;
    effectiveConnectionType: "slow-2g" | "2g" | "3g" | "4g" | null;
    timeToFirstByte: number | null;
    firstPaint: number | null;
    firstContentfulPaint: number | null;
    domContentLoaded: number | null;
    onLoad: number | null;
    url?: string;
    userAgent?: string;
    deviceMemory?: "full" | "lite" | null;
    userTiming?: UserTiming[] | null;
    longTasks?: LongTask[] | null;
    resources?: Resource[] | null;
};