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export const decodeBase64Url = (str: string): Uint8Array => {  return decodeBase64(str.replace(/_|-/g, (m) => ({ _: '/', '-': '+' }[m] ?? m)))}
export const encodeBase64Url = (buf: ArrayBufferLike): string =>  encodeBase64(buf).replace(/\/|\+/g, (m) => ({ '/': '_', '+': '-' }[m] ?? m))
// This approach is written in MDN.// btoa does not support utf-8 characters. So we need a little bit hack.export const encodeBase64 = (buf: ArrayBufferLike): string => {  let binary = ''  const bytes = new Uint8Array(buf)  for (let i = 0, len = bytes.length; i < len; i++) {    binary += String.fromCharCode(bytes[i])  }  return btoa(binary)}
// atob does not support utf-8 characters. So we need a little bit hack.export const decodeBase64 = (str: string): Uint8Array => {  const binary = atob(str)  const bytes = new Uint8Array(new ArrayBuffer(binary.length))  const half = binary.length / 2  for (let i = 0, j = binary.length - 1; i <= half; i++, j--) {    bytes[i] = binary.charCodeAt(i)    bytes[j] = binary.charCodeAt(j)  }  return bytes}