Promise fixes for async

src/psbt.js

@@ -175,20 +175,23 @@ class Psbt extends bip174_1.Psbt {
     return this.addPartialSigToInput(inputIndex, partialSig);
   }
   signInputAsync(inputIndex, keyPair) {
+    return new Promise((resolve, reject) => {
       if (!keyPair || !keyPair.publicKey)
-      throw new Error('Need Signer to sign input');
+        return reject(new Error('Need Signer to sign input'));
       const { hash, sighashType } = getHashAndSighashType(
         this.inputs,
         inputIndex,
         keyPair.publicKey,
         this.globalMap.unsignedTx,
       );
-    return keyPair.sign(hash).then(signature => {
+      Promise.resolve(keyPair.sign(hash)).then(signature => {
         const partialSig = {
           pubkey: keyPair.publicKey,
           signature: bscript.signature.encode(signature, sighashType),
         };
         this.addPartialSigToInput(inputIndex, partialSig);
+        resolve();
+      });
     });
   }
 }

ts_src/psbt.ts

@@ -214,8 +214,10 @@ export class Psbt extends PsbtBase {
   }
 
   signInputAsync(inputIndex: number, keyPair: SignerAsync): Promise<void> {
+    return new Promise(
+      (resolve, reject): void => {
         if (!keyPair || !keyPair.publicKey)
-      throw new Error('Need Signer to sign input');
+          return reject(new Error('Need Signer to sign input'));
         const { hash, sighashType } = getHashAndSighashType(
           this.inputs,
           inputIndex,
@@ -223,14 +225,17 @@ export class Psbt extends PsbtBase {
           this.globalMap.unsignedTx!,
         );
 
-    return keyPair.sign(hash).then(signature => {
+        Promise.resolve(keyPair.sign(hash)).then(signature => {
           const partialSig = {
             pubkey: keyPair.publicKey,
             signature: bscript.signature.encode(signature, sighashType),
           };
 
           this.addPartialSigToInput(inputIndex, partialSig);
+          resolve();
         });
+      },
+    );
   }
 }