/** Test if a string is ascii or not */
export declare const isAscii: RegExp;
/**
 * Encode all ascii values in a map to base64
 * @param obj The object to encode
 * @param skip A list of keys to skip encoding
 */
export declare function convertToBase64Map(obj: {
    data?: Record<string, string>;
}, skip: string[]): void;
/**
 * Decode all ascii values in a map from base64 to utf-8
 * @param obj The object to decode
 * @returns A list of keys that were skipped
 */
export declare function convertFromBase64Map(obj: {
    data?: Record<string, string>;
}): string[];
/** Decode a base64 string */
export declare function base64Decode(data: string): string;
/** Encode a string to base64 */
export declare function base64Encode(data: string): string;
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