@supabase/auth-js/src/lib/polyfills.ts

Official SDK for Supabase Auth

/**
 * https://mathiasbynens.be/notes/globalthis
 */
export function polyfillGlobalThis() {
  if (typeof globalThis === 'object') return
  try {
    Object.defineProperty(Object.prototype, '__magic__', {
      get: function () {
        return this
      },
      configurable: true,
    })
    // @ts-expect-error 'Allow access to magic'
    __magic__.globalThis = __magic__
    // @ts-expect-error 'Allow access to magic'
    delete Object.prototype.__magic__
  } catch (e) {
    if (typeof self !== 'undefined') {
      // @ts-expect-error 'Allow access to globals'
      self.globalThis = self
    }
  }
}