/**
 * @license
 * Copyright 2022-2026 Matter.js Authors
 * SPDX-License-Identifier: Apache-2.0
 */
/**
 * An object that supports custom deep equality.
 */
export interface DeepComparable {
    /**
     * Deep-compare this object to another.
     */
    [DeepComparable.equals](other: unknown): boolean;
}
export declare namespace DeepComparable {
    const equals: unique symbol;
}
export declare function isDeepEqual(a: unknown, b: unknown, ignoreUndefinedProperties?: boolean): boolean;
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