Add debug message to resolve in case of Optionals and ImplicitlyUnrwappedOptionals.

Author: Michael Long

CHANGELOG

@@ -1,5 +1,9 @@
 # Resolver Changelog
 
+### 1.0.2
+
+* Add debug message to resolve in case of Optionals and ImplicitlyUnrwappedOptionals.
+
 ### 1.0.1
 
 * Make ResolverScopeCache initializer visible

Resolver.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "Resolver"
-  s.version      = "1.0.1"
+  s.version      = "1.0.2"
   s.summary      = "An ultralight Dependency Injection / Service Locator framework for Swift 4 and iOS."
   s.homepage     = "https://github.com/hmlongco/Resolver"
   s.license      = "MIT"

Sources/Resolver.swift

@@ -172,7 +172,17 @@ public final class Resolver {
             let service = registration.scope.resolve(resolver: self, registration: registration, args: args) {
             return service
         }
-        fatalError("RESOLVER: '\(Service.self):\(name ?? "")' not resolved")
+        #if DEBUG
+        let typeName = String(describing: type)
+        if typeName.contains("Optional<") {
+            let message = "RESOLVER: \(typeName) not resolved. To disambiguate use resover.optional() instead of resover.resolve()."
+            print(message)
+            fatalError(message)
+        }
+        #endif
+        let message = "RESOLVER: '\(Service.self):\(name ?? "")' not resolved."
+        print(message)
+        fatalError(message)
     }
 
     /// Static function calls the root registry to resolve an optional Service type.