/**
 * Stable per-instance id and source-meta lookup for the timeline.
 *
 * Assigns monotonic numeric ids to ReactiveElement instances via a WeakMap
 * so we never mutate the elements themselves and ids survive HMR (same
 * instance identity after in-place patching).
 *
 * Source metadata is read from the Symbol injected by the source-meta
 * transform — the same one the source-overlay feature uses — so timeline
 * events can deep-link to the component's definition file.
 */
import type { ElementSource } from '../../../types/inspector.js';
import type { TimelineEvent } from '../../../types/timeline.js';
/** A place in a file with a column, which a call site always has. */
export interface ElementCallSite extends ElementSource {
    column: number;
}
/** Returns (and memoises) a stable numeric id for an element instance. */
export declare const idOf: (el: object) => number;
/**
 * Resolves an id back to its element instance, or `undefined` if it was never
 * seen or has since been garbage-collected. Used by the inspector to act on the
 * id the panel sends (details, watch, highlight).
 */
export declare const elementById: (id: number) => Element | undefined;
/** Reads the file/line source metadata injected by the plugin transform. */
export declare const sourceOf: (el: object) => ElementSource | undefined;
/**
 * Extracts the changed property keys from a PropertyValues argument.
 * Returns undefined when `changed` is not a Map (e.g. for lifecycle hooks
 * that don't receive a changed-properties argument).
 */
export declare const changedKeys: (changed: unknown) => string[] | undefined;
/** Where `el` was written in a template, from the attribute the dev transform stamps. */
export declare const callSiteOf: (el: object) => ElementCallSite | undefined;
/**
 * The identity every timeline event of `el` carries: id, tag, where the class
 * is declared and, for an element written in a template, where that is.
 */
export declare const metaOf: (el: object) => NonNullable<TimelineEvent['meta']>;
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