/**
 * Decodes a Base64 string to bytes in browsers and Node.js.
 *
 * Invalid-input behavior follows the platform decoder: browser `atob` can
 * throw, while Node.js can accept some non-canonical input.
 */
export declare function bytesFromBase64(b64: string): Uint8Array;
/** Encodes bytes as a standard Base64 string in browsers and Node.js. */
export declare function base64FromBytes(arr: Uint8Array): string;
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