feat: add new etna experimental spend

Author: erictaylor

src/serializable/avax/utxo.ts

@@ -12,13 +12,13 @@ import { TypeSymbols } from '../constants';
  * @see https://docs.avax.network/specs/avm-transaction-serialization#unsigned-Exporttx
  */
 @serializable()
-export class Utxo {
+export class Utxo<Output extends Serializable = Serializable> {
   _type = TypeSymbols.UTXO;
 
   constructor(
     public readonly utxoId: UTXOID,
     public readonly assetId: Id,
-    public readonly output: Serializable,
+    public readonly output: Output,
   ) {}
 
   static fromBytes(bytes: Uint8Array, codec: Codec): [Utxo, Uint8Array] {

src/serializable/pvm/stakeableLockOut.ts

@@ -11,12 +11,14 @@ import { TypeSymbols } from '../constants';
  * @see https://docs.avax.network/specs/platform-transaction-serialization#stakeablelockin
  */
 @serializable()
-export class StakeableLockOut implements Amounter {
+export class StakeableLockOut<TransferOut extends Amounter = Amounter>
+  implements Amounter
+{
   _type = TypeSymbols.StakeableLockOut;
 
   constructor(
     public readonly lockTime: BigIntPr,
-    public readonly transferOut: Amounter,
+    public readonly transferOut: TransferOut,
   ) {}
 
   amount() {

src/utils/consolidate.ts

@@ -9,7 +9,7 @@
  * @returns an array combined elements
  */
 export const consolidate = <T>(
-  arr: T[],
+  arr: readonly T[],
   canCombine: (a: T, b: T) => boolean,
   combine: (a: T, b: T) => T,
 ): T[] => {

src/vms/pvm/builder.spec.ts

@@ -220,7 +220,7 @@ describe('pvmBuilder', () => {
   });
 
   it('AddValidatorTx - stakeable locked', () => {
-    const utxos = testUtxos();
+    const utxos: Utxo[] = testUtxos();
     const lockTime = BigInt(Math.floor(new Date().getTime() / 1000)) + 10000n;
     const lockedUtxo = new Utxo(
       new UTXOID(testUTXOID1, new Int(0)),
@@ -265,7 +265,7 @@ describe('pvmBuilder', () => {
   });
 
   it('AddDelegatorTx', () => {
-    const utxos = testUtxos();
+    const utxos: Utxo[] = testUtxos();
     const lockTime = BigInt(Math.floor(new Date().getTime() / 1000)) + 10000n;
     const lockedUtxo = new Utxo(
       new UTXOID(testUTXOID1, new Int(0)),

src/vms/pvm/etna-builder/builder.ts

@@ -65,7 +65,7 @@ import {
   getOwnerComplexity,
   getSignerComplexity,
 } from '../txs/fee';
-import { spend } from './spend';
+import { spend } from './experimental-spend';
 
 const getAddressMaps = ({
   inputs,
@@ -317,16 +317,13 @@ export const newImportTx: TxBuilderFn<NewImportTxProps> = (
     outputComplexity,
   );
 
-  const toBurn = new Map<string, bigint>();
-
   const [error, spendResults] = spend(
     {
       complexity,
       excessAVAX: importedAvax,
       fromAddresses,
       ownerOverride: OutputOwners.fromNative(toAddresses, locktime, threshold),
       spendOptions: defaultedOptions,
-      toBurn,
       utxos,
     },
     context,
@@ -892,7 +889,6 @@ export const newAddPermissionlessValidatorTx: TxBuilderFn<
   context,
 ) => {
   const isPrimaryNetwork = subnetId === PrimaryNetworkID.toString();
-  const toBurn = new Map<string, bigint>();
 
   const assetId = stakingAssetId ?? context.avaxAssetID;
 
@@ -935,7 +931,6 @@ export const newAddPermissionlessValidatorTx: TxBuilderFn<
       excessAVAX: 0n,
       fromAddresses: addressesFromBytes(fromAddressesBytes),
       spendOptions: defaultedOptions,
-      toBurn,
       toStake,
       utxos,
     },
@@ -1058,7 +1053,6 @@ export const newAddPermissionlessDelegatorTx: TxBuilderFn<
   if (isPrimaryNetwork && assetId !== context.avaxAssetID)
     throw new Error('Staking asset ID must be AVAX for the primary network.');
 
-  const toBurn = new Map<string, bigint>();
   const toStake = new Map<string, bigint>([[assetId, weight]]);
 
   const defaultedOptions = defaultSpendOptions(fromAddressesBytes, options);
@@ -1085,7 +1079,6 @@ export const newAddPermissionlessDelegatorTx: TxBuilderFn<
       excessAVAX: 0n,
       fromAddresses: addressesFromBytes(fromAddressesBytes),
       spendOptions: defaultedOptions,
-      toBurn,
       toStake,
       utxos,
     },