fix: enable the removal of a signer list (XRPLF#2377)

`SignerQuorum` field has to be 0 and the `SignerEntrys` field has to be `undefined`

Co-authored-by: Caleb Kniffen <[email protected]>

packages/xrpl/src/models/transactions/signerListSet.ts

@@ -23,7 +23,7 @@ export interface SignerListSet extends BaseTransaction {
    * more than 32 members. No address may appear more than once in the list, nor
    * may the Account submitting the transaction appear in the list.
    */
-  SignerEntries: SignerEntry[]
+  SignerEntries?: SignerEntry[]
 }
 
 const MAX_SIGNERS = 32
@@ -36,6 +36,7 @@ const HEX_WALLET_LOCATOR_REGEX = /^[0-9A-Fa-f]{64}$/u
  * @param tx - An SignerListSet Transaction.
  * @throws When the SignerListSet is Malformed.
  */
+// eslint-disable-next-line complexity -- validation can be complex
 export function validateSignerListSet(tx: Record<string, unknown>): void {
   validateBaseTransaction(tx)
 
@@ -47,6 +48,11 @@ export function validateSignerListSet(tx: Record<string, unknown>): void {
     throw new ValidationError('SignerListSet: invalid SignerQuorum')
   }
 
+  // All other checks are for if SignerQuorum is greater than 0
+  if (tx.SignerQuorum === 0) {
+    return
+  }
+
   if (tx.SignerEntries === undefined) {
     throw new ValidationError('SignerListSet: missing field SignerEntries')
   }

packages/xrpl/test/integration/transactions/signerListSet.test.ts

@@ -18,8 +18,9 @@ describe('SignerListSet', function () {
   })
   afterEach(async () => teardownClient(testContext))
 
+  // Add signerlist
   it(
-    'base',
+    'add',
     async () => {
       const tx: SignerListSet = {
         TransactionType: 'SignerListSet',
@@ -44,4 +45,18 @@ describe('SignerListSet', function () {
     },
     TIMEOUT,
   )
+
+  // Remove signerlist
+  it(
+    'remove',
+    async () => {
+      const tx: SignerListSet = {
+        TransactionType: 'SignerListSet',
+        Account: testContext.wallet.classicAddress,
+        SignerQuorum: 0,
+      }
+      await testTransaction(testContext.client, tx, testContext.wallet)
+    },
+    TIMEOUT,
+  )
 })