/**
 * Mirrors timeline events into Chrome DevTools' Performance panel as custom
 * tracks, via `console.timeStamp(label, start, end, track, group, color)`.
 * Browsers that ignore those arguments get the same entries as User Timing
 * marks and measures instead (see {@link userTimingStamp}).
 *
 * Start/end are `performance.now()` values. Paired `:start`/`:end` events
 * become a range; everything else becomes a zero-length marker.
 */
import type { TimelineEvent } from '../../../types/timeline.js';
type TrackColor = 'primary' | 'primary-light' | 'primary-dark' | 'secondary' | 'secondary-light' | 'secondary-dark' | 'tertiary' | 'tertiary-light' | 'tertiary-dark' | 'error';
export type TimeStamp = (label: string, start: number, end: number, track: string, group: string, color: TrackColor) => void;
export interface ChromeTracksSink {
    push(event: TimelineEvent): void;
    reset(): void;
}
interface NavigatorLike {
    userAgent?: string;
    userAgentData?: {
        brands?: readonly {
            brand: string;
            version: string;
        }[];
    };
}
/**
 * Whether this browser draws `console.timeStamp`'s track arguments: Chromium
 * 134 or newer. There's no feature test for the extra arguments (older
 * Chrome, Firefox and Safari accept the call and ignore them), so this reads
 * the version. `userAgentData` only exists in secure contexts, so a dev
 * server reached over plain http on a LAN address falls back to the UA
 * string's `Chrome/<major>`, which every Chromium browser keeps.
 */
export declare const chromeTracksSupported: (nav?: NavigatorLike | undefined) => boolean;
/**
 * The same entries as User Timing: a range becomes a measure, a marker a
 * mark, named `lit:<track> <label>` so a profiler's filter finds them. The
 * Firefox Profiler shows them in its Marker Chart. Each entry is cleared
 * right after it's made: profilers record it when it's made, and the page's
 * own performance timeline, which nothing trims, shouldn't fill up with a
 * page's worth of updates.
 */
export declare const userTimingStamp: TimeStamp;
/** The stamp for this browser: Chrome's tracks where it draws them. */
export declare const profilerStamp: (tracks: boolean) => TimeStamp;
export declare const createChromeTracksSink: (stamp?: TimeStamp, toPerf?: (t: number) => number) => ChromeTracksSink;
export {};
//# sourceMappingURL=chrome-tracks.d.ts.map