/**
 * @license
 * Copyright 2022-2026 Matter.js Authors
 * SPDX-License-Identifier: Apache-2.0
 */
export declare namespace Base64 {
    /**
     * Encodes base64.
     *
     * @param input an indexable sequence of bytes
     * @param url set to true to encode as base46url
     * @returns an encoded string
     */
    function encode(input: ArrayLike<number>, url?: boolean): string;
    /**
     * Decodes base64.
     *
     * @param input binary data encoded as a base64 or base64url string
     * @returns decoded bytes in a ByteArray
     */
    function decode(input: string): Uint8Array<ArrayBuffer>;
}
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