/**
* Returns a timestamp in seconds since the UNIX epoch using the Date API.
*/
export declare const dateTimestampInSeconds: () => number;
/**
* Returns a timestamp in seconds since the UNIX epoch using either the Performance or Date APIs, depending on the
* availability of the Performance API.
*
* See `usingPerformanceAPI` to test whether the Performance API is used.
*
* BUG: Note that because of how browsers implement the Performance API, the clock might stop when the computer is
* asleep. This creates a skew between `dateTimestampInSeconds` and `timestampInSeconds`. The
* skew can grow to arbitrary amounts like days, weeks or months.
* See https://github.com/getsentry/sentry-javascript/issues/2590.
*/
export declare const timestampInSeconds: () => number;
export declare const timestampWithMs: () => number;
/**
* A boolean that is true when timestampInSeconds uses the Performance API to produce monotonic timestamps.
*/
export declare const usingPerformanceAPI: boolean;
/**
* Internal helper to store what is the source of browserPerformanceTimeOrigin below. For debugging only.
*/
export declare let _browserPerformanceTimeOriginMode: string;
/**
* The number of milliseconds since the UNIX epoch. This value is only usable in a browser, and only when the
* performance API is available.
*/
export declare const browserPerformanceTimeOrigin: number | undefined;
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