/**
 * The Timeline's element and regex filters, as pure functions.
 *
 * Both presentations (the list and the tracks) answer "show me only this
 * element" or "only things matching /update/". The filter state therefore
 * lives in `timeline-view` and each presentation applies it here, so the two
 * cannot drift apart on what a match means.
 */
import type { TimelineEvent } from '../../types/timeline.js';
import type { TimelineSpan } from './derive.js';
/**
 * Compiles the regex box. An empty box matches everything. A pattern that
 * does not compile (the user is mid-typing `foo(`) disables the filter rather
 * than hiding every row, and is reported as `invalid` so the input can say so.
 */
export declare const compileRegex: (source: string) => {
    re: RegExp | null;
    invalid: boolean;
};
/** Text the regex filter searches: element tag, name, subtitle and the
 *  changed property keys (the reason is worth searching for by name). */
export declare const spanHaystack: (span: TimelineSpan) => string;
/**
 * Applies the element and regex filters. `re` comes from {@link compileRegex}
 * so a caller filtering on every keystroke compiles once, not per span.
 */
export declare const filterSpans: (spans: readonly TimelineSpan[], elementId: number | null, re: RegExp | null) => TimelineSpan[];
/** Distinct elements (by stable id) seen across the recorded events. */
export declare const listElements: (events: readonly TimelineEvent[]) => Array<{
    id: number;
    tag: string;
}>;
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