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/*** Convert from byte array to base64 code.* @param data byte array.* @return base64 code.*/export function base64Encode(data:Uint8Array){    return btoa([...data].map(n => String.fromCharCode(n)).join(""));}
/*** Convert from base64 code to byte array.* @param data base64 code.* @return byte array.*/export function base64Decode(data:string){    return new Uint8Array([...atob(data)].map(s => s.charCodeAt(0)));}