/**
 * Class which exposes APIs to decode base64 strings to plaintext. See here for implementation details:
 * https://developer.mozilla.org/en-US/docs/Glossary/Base64#the_unicode_problem
 */
/**
 * Returns a URL-safe plaintext decoded string from b64 encoded input.
 * @param input
 */
export declare function base64Decode(input: string): string;
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