Add inputCount getter

src/transaction_builder_v2.js

@@ -139,6 +139,9 @@ class TransactionBuilderV2 {
       value,
     });
   }
+  get inputCount() {
+    return this.__INPUTS.length;
+  }
   addOutput(scriptPubKey, value) {
     if (!this.__canModifyOutputs()) {
       throw new Error('No, this would invalidate signatures');

ts_src/transaction_builder_v2.ts

@@ -226,6 +226,10 @@ export class TransactionBuilderV2 {
     });
   }
 
+  get inputCount(): number {
+    return this.__INPUTS.length;
+  }
+
   addOutput(scriptPubKey: string | Buffer, value: number): number {
     if (!this.__canModifyOutputs()) {
       throw new Error('No, this would invalidate signatures');

types/transaction_builder_v2.d.ts

@@ -16,6 +16,7 @@ export declare class TransactionBuilderV2 {
     setLockTime(locktime: number): void;
     setVersion(version: number): void;
     addInput(txHash: Buffer | string | Transaction, vout: number, sequence?: number, prevOutScript?: Buffer): number;
+    readonly inputCount: number;
     addOutput(scriptPubKey: string | Buffer, value: number): number;
     build(): Transaction;
     buildIncomplete(): Transaction;