test: run binary-codec tests in the browser (#2566)

- Convert tests to typescript
- Update type definitions causing errors in tests
  - `makeParser` to accept a `Buffer` in addition to `string`
  - `SerializedType` constructor allows not passing in a byte array
  - `Comparable` is now a generic type so that it allows `compareTo`
methods to take more that the type itself. Example: `Uint64.compareTo`
can accept `number`
- Update tests to use jasmine compatible functions
  - Switching from `test` to `it`.
  - Updated test checking if coretypes all implement SerializedType
  - Import fixtures directly instead of using `loadFixture` utility
- Remove importing of `buffer/` explicitly.  It was throwing off type
checking in tests.  Buffer is going away in a future PR anyway.
- Fixed `npm run clean` not clearing `.tsbuildinfo` files for keypairs
- Remove unused account-tx-transactions.db. It was likely used in the
past to test historical ledgers.

packages/ripple-binary-codec/test/ledger.test.ts

@@ -0,0 +1,33 @@
+import ledgerFull38129 from './fixtures/ledger-full-38129.json'
+import ledgerFull40000 from './fixtures/ledger-full-40000.json'
+
+const {
+  transactionTreeHash,
+  ledgerHash,
+  accountStateHash,
+} = require('../src/ledger-hashes')
+
+describe('Ledger Hashes', function () {
+  function testFactory(
+    ledgerIndex: number,
+    ledger: typeof ledgerFull38129 | typeof ledgerFull40000,
+  ) {
+    describe(`can calculate hashes for ledger ${ledgerIndex}`, function () {
+      it('computes correct account state hash', function () {
+        expect(accountStateHash(ledger.accountState).toHex()).toBe(
+          ledger.account_hash,
+        )
+      })
+      it('computes correct transaction tree hash', function () {
+        expect(transactionTreeHash(ledger.transactions).toHex()).toBe(
+          ledger.transaction_hash,
+        )
+      })
+      it('computes correct ledger header hash', function () {
+        expect(ledgerHash(ledger).toHex()).toBe(ledger.hash)
+      })
+    })
+  }
+  testFactory(38129, ledgerFull38129)
+  testFactory(40000, ledgerFull40000)
+})