Add

• Opt-in support for muxed accounts. This introduces M... addresses from SEP-23, which multiplex a Stellar G... address across IDs to eliminate the need for ad-hoc multiplexing via the Transaction.memo field (see the relevant SEP-29 and blog post on the topic). The following operations now support muxed accounts (#416):
  • Payment.destination
  • PathPaymentStrictReceive.destination
  • PathPaymentStrictSend.destination
  • Operation.sourceAccount
  • AccountMerge.destination
  • Transaction.sourceAccount

The above changeset also introduces a new high-level object, MuxedAccount (not to be confused with xdr.MuxedAccount, which is the underlying raw representation) to make working with muxed accounts easier. You can use it to easily create and manage muxed accounts and their underlying shared Account, passing them along to the supported operations and TransactionBuilder:

  const PUBKEY = 'GA7QYNF7SOWQ3GLR2BGMZEHXAVIRZA4KVWLTJJFC7MGXUA74P7UJVSGZ';
  const ACC = new StellarBase.Account(PUBKEY, '1');

  const mux1 = new StellarBase.MuxedAccount(ACC, '1000');
  console.log(mux1.accountId(), mux1.id());
  // MA7QYNF7SOWQ3GLR2BGMZEHXAVIRZA4KVWLTJJFC7MGXUA74P7UJUAAAAAAAAAAD5DTGC 1000

  const mux2 = ACC.createSubaccount('2000');
  console.log("Parent relationship preserved:", 
              mux2.baseAccount().accountId() === mux1.baseAccount().accountId());
  console.log(mux2.accountId(), mux2.id());
  // MA7QYNF7SOWQ3GLR2BGMZEHXAVIRZA4KVWLTJJFC7MGXUA74P7UJUAAAAAAAAAAH2B4RU 2000

  mux1.setID('3000');
  console.log("Underlying account unchanged:", 
              ACC.accountId() === mux1.baseAccount().accountId());
  console.log(mux1.accountId(), mux1.id());
  // MA7QYNF7SOWQ3GLR2BGMZEHXAVIRZA4KVWLTJJFC7MGXUA74P7UJUAAAAAAAAAALXC5LE 3000

You can refer to the test suite (at test/unit/muxed_account_test.js) for more uses of the API.

Update

• Modernize the minimum-supported browser versions for the library (#419).

Fix

• Update Typescript test for SetOptions to use authorization flags (e.g. AuthRequiredFlag) correctly (#418).