/**
 * Public timeline API — re-exported by the `virtual:lit-plugin/timeline`
 * virtual module so app code and other plugins can contribute events and
 * custom layers without reaching into plugin internals.
 *
 * This module shares the same `transport.ts` instance as `install.ts`, so
 * events emitted here flow through the same batched HMR channel to the panel.
 */
import type { TimelineEvent, TimelineEventInput, TimelineLayer } from '../../../types/timeline.js';
export type { TimelineEvent, TimelineEventInput, TimelineLayer };
/**
 * Emit a custom timeline event from app code. `time` is a
 * `performance.now()` value; leave it out to stamp the event as it is added.
 *
 * The event is forwarded to the Timeline panel when recording is active.
 * Use a custom `layerId` registered with `addTimelineLayer`, or one of the
 * built-in layer ids (`'lit-lifecycle'`, `'lit-render'`,
 * `'lit-render-verbose'`, `'mouse'`, `'keyboard'`, `'custom-events'`,
 * `'lit-warnings'`).
 *
 * No-ops in production (the HMR channel is absent; events are dropped in the
 * transport queue).
 */
export declare const addTimelineEvent: (event: TimelineEventInput) => void;
/**
 * Register a custom timeline layer and announce it to the panel.
 *
 * The panel adds the layer to its toggle strip after the built-in layers.
 * The registration message is sent once on first call; duplicate ids are
 * ignored.
 */
export declare const addTimelineLayer: (layer: TimelineLayer) => void;
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