refactor: have promises resolve to undefined.

bin/cli

@@ -542,7 +542,7 @@ CLI.prototype.destroy = function destroy() {
     this.wallet.client.destroy();
   if (this.client && !this.client.loading)
     this.client.destroy();
-  return Promise.resolve(null);
+  return Promise.resolve();
 };
 
 main = co(function* main() {

lib/chain/chaindb.js

@@ -911,7 +911,7 @@ ChainDB.prototype.getTX = co(function* getTX(hash) {
 
 ChainDB.prototype.hasTX = function hasTX(hash) {
   if (!this.options.indexTX)
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   return this.db.has(layout.t(hash));
 };

lib/http/client.js

@@ -140,12 +140,12 @@ HTTPClient.prototype._sendAuth = function _sendAuth() {
 
 HTTPClient.prototype._close = function close() {
   if (!this.socket)
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   this.socket.disconnect();
   this.socket = null;
 
-  return Promise.resolve(null);
+  return Promise.resolve();
 };
 
 /**
@@ -384,7 +384,7 @@ HTTPClient.prototype.join = function join(id, token) {
   var self = this;
 
   if (!this.socket)
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   return new Promise(function(resolve, reject) {
     self.socket.emit('wallet join', id, token, function(err) {
@@ -404,7 +404,7 @@ HTTPClient.prototype.leave = function leave(id) {
   var self = this;
 
   if (!this.socket)
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   return new Promise(function(resolve, reject) {
     self.socket.emit('wallet leave', id, function(err) {

lib/http/rpc.js

@@ -417,7 +417,7 @@ RPC.prototype.addnode = function addnode(args) {
       break;
   }
 
-  return Promise.resolve(null);
+  return Promise.resolve();
 };
 
 RPC.prototype.disconnectnode = function disconnectnode(args) {
@@ -433,7 +433,7 @@ RPC.prototype.disconnectnode = function disconnectnode(args) {
   if (peer)
     peer.destroy();
 
-  return Promise.resolve(null);
+  return Promise.resolve();
 };
 
 RPC.prototype.getaddednodeinfo = function getaddednodeinfo(args) {
@@ -546,7 +546,7 @@ RPC.prototype.ping = function ping(args) {
   for (i = 0; i < this.pool.peers.all.length; i++)
     this.pool.peers.all[i].sendPing();
 
-  return Promise.resolve(null);
+  return Promise.resolve();
 };
 
 RPC.prototype.setban = function setban(args) {
@@ -571,7 +571,7 @@ RPC.prototype.setban = function setban(args) {
       break;
   }
 
-  return Promise.resolve(null);
+  return Promise.resolve();
 };
 
 RPC.prototype.listbanned = function listbanned(args) {
@@ -603,7 +603,7 @@ RPC.prototype.clearbanned = function clearbanned(args) {
 
   this.pool.hosts.clear();
 
-  return Promise.resolve(null);
+  return Promise.resolve();
 };
 
 RPC.prototype._deployment = function _deployment(id, version, status) {
@@ -2199,7 +2199,7 @@ RPC.prototype.signrawtransaction = co(function* signrawtransaction(args) {
 
 RPC.prototype._fillCoins = function _fillCoins(tx) {
   if (this.chain.db.options.spv)
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   return this.node.fillCoins(tx);
 };
@@ -2645,7 +2645,7 @@ RPC.prototype.invalidateblock = function invalidateblock(args) {
 
   this.chain.invalid[hash] = true;
 
-  return Promise.resolve(null);
+  return Promise.resolve();
 };
 
 RPC.prototype.reconsiderblock = function reconsiderblock(args) {
@@ -2661,7 +2661,7 @@ RPC.prototype.reconsiderblock = function reconsiderblock(args) {
 
   delete this.chain.invalid[hash];
 
-  return Promise.resolve(null);
+  return Promise.resolve();
 };
 
 RPC.prototype.setmocktime = function setmocktime(args) {
@@ -2678,7 +2678,7 @@ RPC.prototype.setmocktime = function setmocktime(args) {
   delta = time.now() - time;
   time.offset = -delta;
 
-  return Promise.resolve(null);
+  return Promise.resolve();
 };
 
 /*
@@ -3313,7 +3313,7 @@ RPC.prototype.importpubkey = co(function* importpubkey(args) {
 RPC.prototype.keypoolrefill = function keypoolrefill(args) {
   if (args.help || args.length > 1)
     return Promise.reject(new RPCError('keypoolrefill ( newsize )'));
-  return Promise.resolve(null);
+  return Promise.resolve();
 };
 
 RPC.prototype.listaccounts = co(function* listaccounts(args) {

lib/http/server.js

@@ -1579,7 +1579,7 @@ ClientSocket.prototype.scanner = function scanner(entry, txs) {
 
   this.emit('block tx', entry.toJSON(), json);
 
-  return Promise.resolve(null);
+  return Promise.resolve();
 };
 
 ClientSocket.prototype.join = function join(id) {

lib/mempool/mempool.js

@@ -137,7 +137,7 @@ Mempool.prototype._open = co(function* open() {
  */
 
 Mempool.prototype._close = function close() {
-  return Promise.resolve(null);
+  return Promise.resolve();
 };
 
 /**

lib/net/peer.js

@@ -655,7 +655,7 @@ Peer.prototype.sendPing = function sendPing() {
 
   if (this.challenge) {
     this.logger.debug('Peer has not responded to ping (%s).', this.hostname);
-    return Promise.resolve(null);
+    return Promise.resolve();
   }
 
   this.lastPing = utils.ms();
@@ -692,7 +692,7 @@ Peer.prototype.isWatched = function isWatched(item) {
 
 Peer.prototype.updateWatch = function updateWatch() {
   if (!this.options.spv)
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   return this.send(new packets.FilterLoadPacket(this.pool.spvFilter));
 };
@@ -768,7 +768,7 @@ Peer.prototype.write = function write(data) {
   var self = this;
 
   if (this.destroyed)
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   this.lastSend = utils.ms();
 
@@ -778,7 +778,7 @@ Peer.prototype.write = function write(data) {
     });
   }
 
-  return Promise.resolve(null);
+  return Promise.resolve();
 };
 
 /**
@@ -2254,7 +2254,7 @@ Peer.prototype._handleBlockTxn = function _handleBlockTxn(packet) {
 
 Peer.prototype.sendAlert = function sendAlert(alert) {
   if (!this.invFilter.added(alert.hash()))
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   return this.send(alert);
 };
@@ -2322,13 +2322,13 @@ Peer.prototype.sendGetBlocks = function getBlocks(locator, stop) {
 
 Peer.prototype.sendMempool = function sendMempool() {
   if (!this.version)
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   if (!this.version.hasBloom()) {
     this.logger.debug(
       'Cannot request mempool for non-bloom peer (%s).',
       this.hostname);
-    return Promise.resolve(null);
+    return Promise.resolve();
   }
 
   this.logger.debug(
@@ -2481,20 +2481,20 @@ Peer.prototype.sync = function sync() {
   var tip;
 
   if (!this.pool.syncing)
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   if (!this.ack)
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   if (this.syncSent)
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   if (!this.version.hasNetwork())
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   if (!this.isLoader()) {
     if (!this.chain.synced)
-      return Promise.resolve(null);
+      return Promise.resolve();
   }
 
   // Ask for the mempool if we're synced.

lib/node/fullnode.js

@@ -418,7 +418,7 @@ Fullnode.prototype.getCoin = function getCoin(hash, index) {
     return Promise.resolve(coin);
 
   if (this.mempool.isSpent(hash, index))
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   return this.chain.db.getCoin(hash, index);
 };

lib/utils/locker.js

@@ -158,7 +158,7 @@ Locker.prototype.onDrain = function onDrain() {
   assert(this.add, 'Cannot wait for drain without add method.');
 
   if (this.pending.length === 0)
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   return new Promise(function(resolve, reject) {
     self.once('drain', resolve);

lib/wallet/account.js

@@ -244,10 +244,10 @@ Account.prototype.init = co(function* init() {
 
 Account.prototype.open = function open() {
   if (!this.initialized)
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   if (this.receive)
-    return Promise.resolve(null);
+    return Promise.resolve();
 
   this.receive = this.deriveReceive(this.receiveDepth - 1);
   this.change = this.deriveChange(this.changeDepth - 1);
@@ -255,7 +255,7 @@ Account.prototype.open = function open() {
   if (this.witness)
     this.nested = this.deriveNested(this.nestedDepth - 1);
 
-  return Promise.resolve(null);
+  return Promise.resolve();
 };
 
 /**

test/chain-test.js

@@ -241,7 +241,7 @@ describe('Chain', function() {
 
     yield chain.db.scan(null, hashes, function(block, txs) {
       total += txs.length;
-      return Promise.resolve(null);
+      return Promise.resolve();
     });
 
     assert.equal(total, 25);