/**
 * Helper functions having to do with [Base64](https://en.wikipedia.org/wiki/Base64).
 *
 * @module
 */
/** Helper function to decode a base64-encoded string to a UTF-8 string. */
export declare function decodeBase64(base64String: string): string;
/** Helper function to encode a string into a base64-encoded string. */
export declare function encodeBase64(string: string): string;
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