/**
 * lit-render timeline layers — listen to the built-in lit-debug CustomEvents
 * instead of patching prototypes, so they're zero-cost when the Lit debug
 * flag is off and perfectly accurate for the render layers.
 *
 * `globalThis.emitLitDebugLogEvents = true` gates the events, and lit-html
 * dispatches a CustomEvent per render whenever it's set — a real per-render
 * cost. So the caller drives the flag via {@link setRenderDebugEnabled} from
 * `recording × (lit-render OR lit-render-verbose enabled)` rather than
 * leaving it on for the whole session.
 * The events are tagged `*Unstable` in the Lit source; we tolerate missing
 * `kind` values gracefully.
 *
 * begin render / end render share a numeric `id` → we use it as groupId so
 * the panel can show a duration bar for each render call.
 *
 * `template updating` / `template instantiated[ and updated]` / `set part` /
 * `commit *` fire once per template-bound part on *every* render — extremely
 * high volume (a ticking clock or animation floods the layer). They're
 * emitted on the separate opt-in `lit-render-verbose` layer rather than
 * `lit-render`, so the common case (the begin/end render duration bar) stays
 * quiet by default.
 */
import type { TimelineEvent } from '../../../types/timeline.js';
type EmitFn = (event: TimelineEvent) => void;
type RecordingFn = () => boolean;
type LayerEnabledFn = () => boolean;
/**
 * Install the lit-debug render layers (`lit-render` and the opt-in
 * `lit-render-verbose`).
 * Idempotent — calling again when already installed is a no-op.
 */
export declare const installRenderLayer: (emit: EmitFn, recording: RecordingFn, renderEnabled: LayerEnabledFn, verboseEnabled: LayerEnabledFn) => void;
/**
 * Toggle Lit's debug event system. Enabling makes lit-html dispatch a
 * CustomEvent on every render (dev-only; no-op in prod builds), so the caller
 * keeps it off unless the render layer is actively recording.
 */
export declare const setRenderDebugEnabled: (enabled: boolean) => void;
/** Remove the listener and clear the Lit debug flag. */
export declare const uninstallRenderLayer: () => void;
export {};
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