/**
 * UTF-8 string -> base64. Same idea as `btoa(unescape(encodeURIComponent(s)))` without `unescape`.
 * @param {string} input
 */
export function encodeUtf8Base64(input: string): string;
/**
 * base64 -> UTF-8 string. Decodes bytes then UTF-8 via percent-encoding.
 * @param {string} b64
 */
export function decodeUtf8Base64(b64: string): string;
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