/**
 * Encode a string to base64
 * @param {string} s The string to encode
 * @returns {string} The base64 encoded string
 */
export declare function toBase64(s: string): string;
/**
 * Safely get text from a Response object
 * @param {Response} res The Response object
 * @returns {Promise<string>} The text content or empty string on failure
 */
export declare function safeText(res: Response): Promise<string>;
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