swift5: void promise must take void argument vs no argument

Signal/src/Models/AccountManager.swift

@@ -83,10 +83,10 @@ public class AccountManager: NSObject {
 
     private func registerForTextSecure(verificationCode: String,
                                        pin: String?) -> Promise<Void> {
-        return Promise<Any> { resolver in
+        return Promise { resolver in
             tsAccountManager.verifyAccount(withCode: verificationCode,
                                            pin: pin,
-                                           success: resolver.fulfill,
+                                           success: { resolver.fulfill(()) },
                                            failure: resolver.reject)
         }
     }
@@ -106,10 +106,10 @@ public class AccountManager: NSObject {
     // MARK: Message Delivery
 
     func updatePushTokens(pushToken: String, voipToken: String) -> Promise<Void> {
-        return Promise<Any> { resolver in
+        return Promise { resolver in
             tsAccountManager.registerForPushNotifications(pushToken: pushToken,
                                                           voipToken: voipToken,
-                                                          success: resolver.fulfill,
+                                                          success: { resolver.fulfill(()) },
                                                           failure: resolver.reject)
         }
     }

SignalServiceKit/src/Util/MessageSender+Promise.swift

@@ -10,9 +10,9 @@ public extension MessageSender {
     /**
      * Wrap message sending in a Promise for easier callback chaining.
      */
-    public func sendPromise(message: TSOutgoingMessage) -> Promise<Void> {
-        let promise: Promise<Void> = Promise<Any> { resolver in
-            self.send(message, success: resolver.fulfill, failure: resolver.reject)
+    func sendPromise(message: TSOutgoingMessage) -> Promise<Void> {
+        let promise: Promise<Void> = Promise { resolver in
+            self.send(message, success: { resolver.fulfill(()) }, failure: resolver.reject)
         }
 
         // Ensure sends complete before they're GC'd.

SignalServiceKit/src/Util/YapDatabase+Promise.swift

@@ -13,13 +13,13 @@ public extension YapDatabaseConnection {
     }
 
     func readWritePromise(_ block: @escaping (YapDatabaseReadWriteTransaction) -> Void) -> Promise<Void> {
-        return Promise<Any> { resolver in
-            self.asyncReadWrite(block, completionBlock: resolver.fulfill)
+        return Promise { resolver in
+            self.asyncReadWrite(block, completionBlock: { resolver.fulfill(()) })
         }
     }
 
     func read(_ block: @escaping (YapDatabaseReadTransaction) throws -> Void) throws {
-        var errorToRaise: Error? = nil
+        var errorToRaise: Error?
 
         read { transaction in
             do {
@@ -35,7 +35,7 @@ public extension YapDatabaseConnection {
     }
 
     func readWrite(_ block: @escaping (YapDatabaseReadWriteTransaction) throws -> Void) throws {
-        var errorToRaise: Error? = nil
+        var errorToRaise: Error?
 
         readWrite { transaction in
             do {