Add IsValidTypeName function

Author: greymind

src/WebApiToTypeScript/Types/TypeService.cs

@@ -10,6 +10,9 @@ namespace WebApiToTypeScript.Types
 {
     public class TypeService : ServiceAware
     {
+        private Regex ValidTypeNameRegex { get; }
+            = new Regex("^[a-zA-Z_][a-zA-Z0-9_]*$");
+
         private Dictionary<string, List<Type>> PrimitiveTypesMapping { get; }
             = new Dictionary<string, List<Type>>();
 
@@ -37,6 +40,11 @@ public string FixIfReservedWord(string word)
                 : word;
         }
 
+        public bool IsValidTypeName(string typeName)
+        {
+            return ValidTypeNameRegex.IsMatch(typeName);
+        }
+
         public void LoadAllTypes(string webApiModuleFilePath)
         {
             var webApiApplicationModule = ModuleDefinition