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import { Buffer } from "https://deno.land/std@0.158.0/node/buffer.ts";export const encodeBase64 = (str: string): string => {  if (str === null) {    throw new TypeError('1st argument of "encodeBase64" should not be null.')  }  try {    const encoder = new TextEncoder()    const bytes = encoder.encode(str)    return btoa(String.fromCharCode(...bytes))  } catch {}
  try {    return Buffer.from(str).toString('base64')  } catch (e) {    console.error('If you want to do "encodeBase64", polyfill "buffer" module.')    throw e  }}
export const decodeBase64 = (str: string): string => {  if (str === null) {    throw new TypeError('1st argument of "decodeBase64" should not be null.')  }  try {    const text = atob(str)    const bytes = new Uint8Array(text.split('').map((c) => c.charCodeAt(0)))    const decoder = new TextDecoder()    return decoder.decode(bytes)  } catch {}
  try {    return Buffer.from(str, 'base64').toString()  } catch (e) {    console.error('If you want to do "decodeBase64", polyfill "buffer" module.')    throw e  }}
export const encodeBase64URL = (str: string): string => {  return encodeBase64(str).replace(/=/g, '').replace(/\+/g, '-').replace(/\//g, '_')}
export const decodeBase64URL = (str: string): string => {  const pad = (s: string) => {    const diff = s.length % 4    if (diff === 2) {      return `${s}==`    }    if (diff === 3) {      return `${s}=`    }    return s  }
  return decodeBase64(pad(str).replace(/-/g, '+').replace('_', '/'))}
export const utf8ToUint8Array = (str: string): Uint8Array => {  const encoder = new TextEncoder()  return encoder.encode(str)}
export const arrayBufferToBase64 = async (buf: ArrayBuffer): Promise<string> => {  if (typeof btoa === 'function') {    return btoa(String.fromCharCode(...new Uint8Array(buf)))  }
  try {    return Buffer.from(String.fromCharCode(...new Uint8Array(buf))).toString('base64')  } catch (e) {}
  return ''}
export const arrayBufferToBase64URL = async (buf: ArrayBuffer) => {  return (await arrayBufferToBase64(buf)).replace(/=/g, '').replace(/\+/g, '-').replace(/\//g, '_')}