feat(utxo-lib,abstract-utxo): enhance PSBT testing and transaction explanation utilities

modules/abstract-utxo/src/abstractUtxoCoin.ts

@@ -200,8 +200,8 @@ export function isWalletOutput(output: Output): output is FixedScriptWalletOutpu
   );
 }
 
-export interface TransactionExplanation extends BaseTransactionExplanation<string, string> {
-  locktime: number;
+export interface TransactionExplanation<TFee = string> extends BaseTransactionExplanation<TFee, string> {
+  locktime?: number;
   /** NOTE: this actually only captures external outputs */
   outputs: Output[];
   changeOutputs: Output[];
@@ -872,7 +872,7 @@ export abstract class AbstractUtxoCoin extends BaseCoin {
    */
   async explainTransaction<TNumber extends number | bigint = number>(
     params: ExplainTransactionOptions<TNumber>
-  ): Promise<TransactionExplanation> {
+  ): Promise<TransactionExplanation<string | undefined>> {
     return explainTx(this.decodeTransactionFromPrebuild(params), params, this.network);
   }
 

modules/abstract-utxo/src/impl/doge/doge.ts

@@ -114,7 +114,7 @@ export class Doge extends AbstractUtxoCoin {
 
   async explainTransaction<TNumber extends number | bigint = bigint>(
     params: ExplainTransactionOptions<TNumber> | (ExplainTransactionOptions<TNumber> & { txInfo: TransactionInfoJSON })
-  ): Promise<TransactionExplanation> {
+  ): Promise<TransactionExplanation<string | undefined>> {
     return super.explainTransaction({
       ...params,
       txInfo: params.txInfo ? parseTransactionInfo(params.txInfo as TransactionInfoJSON) : undefined,

modules/abstract-utxo/src/offlineVault/TransactionExplanation.ts

@@ -8,18 +8,18 @@ export interface ExplanationOutput {
   amount: string | number;
 }
 
-export interface TransactionExplanation {
+export interface TransactionExplanation<TFee> {
   outputs: ExplanationOutput[];
   changeOutputs: ExplanationOutput[];
   fee: {
     /* network fee */
-    fee: string | number;
+    fee: TFee;
     payGoFeeString: string | number | undefined;
     payGoFeeAddress: string | undefined;
   };
 }
 
-export function getTransactionExplanation(coin: string, tx: unknown): TransactionExplanation {
+export function getTransactionExplanation(coin: string, tx: unknown): TransactionExplanation<string> {
   if (!OfflineVaultSignable.is(tx)) {
     throw new Error('not a signable transaction');
   }

modules/abstract-utxo/src/offlineVault/descriptor/transaction.ts

@@ -45,7 +45,7 @@ export function getHalfSignedPsbt(
 export function getTransactionExplanationFromPsbt(
   tx: DescriptorTransaction,
   network: utxolib.Network
-): TransactionExplanation {
+): TransactionExplanation<string> {
   const psbt = utxolib.bitgo.createPsbtDecode(tx.coinSpecific.txHex, network);
   const descriptorMap = getDescriptorsFromDescriptorTransaction(tx);
   const { outputs, changeOutputs, fee } = explainPsbt(psbt, descriptorMap);

modules/abstract-utxo/src/transaction/descriptor/explainPsbt.ts

@@ -34,7 +34,7 @@ function getInputSignatures(psbt: utxolib.bitgo.UtxoPsbt): number[] {
 export function explainPsbt(
   psbt: utxolib.bitgo.UtxoPsbt,
   descriptors: coreDescriptors.DescriptorMap
-): TransactionExplanation {
+): TransactionExplanation<string> {
   const parsedTransaction = coreDescriptors.parse(psbt, descriptors, psbt.network);
   const { inputs, outputs } = parsedTransaction;
   const externalOutputs = outputs.filter((o) => o.scriptId === undefined);

modules/abstract-utxo/src/transaction/explainTransaction.ts

@@ -22,7 +22,7 @@ export function explainTx<TNumber extends number | bigint>(
     changeInfo?: fixedScript.ChangeAddressInfo[];
   },
   network: utxolib.Network
-): TransactionExplanation {
+): TransactionExplanation<string | undefined> {
   if (params.wallet && isDescriptorWallet(params.wallet)) {
     if (tx instanceof utxolib.bitgo.UtxoPsbt) {
       if (!params.pubs || !isTriple(params.pubs)) {