/**
 * Old/new value previews for the properties that triggered a Lit update.
 *
 * Lit hands `update` a Map of changed key -> *old* value; the new value is
 * read off the element. Opt-in (the Changed values layer) and capped, so a
 * component with many properties cannot turn each update into a large event.
 * Runs inside the inspected page: nothing here may throw into the app.
 */
import type { ChangedValue } from '../../../types/timeline.js';
/**
 * Deep equality for values that were assigned as different references: plain
 * objects, arrays and dates are compared by content; every other object (Map,
 * Set, class instances, DOM nodes, functions) is equal only by identity.
 * Bounded by `budget` visited values and a depth of six, so a large or cyclic
 * structure ends as "not equal" rather than as work. Accessor properties are
 * never invoked: a getter makes the pair unequal.
 */
export declare const budgetedDeepEqual: (a: unknown, b: unknown, budget?: number) => boolean;
/**
 * One entry per changed key (first `maxKeys`, in Map order), or `undefined`
 * when `changed` is not a non-empty Map. Never throws.
 */
export declare const captureChangedValues: (host: object, changed: unknown, maxKeys?: number) => ChangedValue[] | undefined;
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