import {
  // Encode a string in base-64
  btoa,
  // Decode a string in base-64
  atob,

  // Encode a string into base64url
  btoau,
  // Decode a base64url-encoded string
  atobu
} from 'b2a'

btoa('a')           // 'YQ=='
window.btoa('a')    // 'YQ==', works fine with ASCII characters


// Oooooooops!
// In most browsers, calling btoa() on a Unicode string
// will cause a Character Out Of Range exception.
window.btoa('中文')  // throws InvalidCharacterError ❌

btoa('中文')         // '5Lit5paH' ✅


// Oooooooops!
window.atob('5Lit5paH')   // '中æ', oh no! ❌

atob('5Lit5paH')          // '中文', great! ✅


btoau('μπορούμε')                 // zrzPgM6_z4HOv8-NzrzOtQ==

atobu('zrzPgM6_z4HOv8-NzrzOtQ==') // μπορούμε

import {btoau} from 'b2a'

location.href = `https://domain.com/login?return_to=${btoau(location.href)}`