/**
 * Convert string to URL-safe base64
 * @param str The string to encode
 * @returns URL-safe base64 encoded string
 */
export declare function toBase64UrlSafe(str: string): string;
/**
 * Convert URL-safe base64 to string
 * @param base64 The URL-safe base64 string to decode
 * @returns Decoded string
 */
export declare function fromBase64UrlSafe(base64: string): string;
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