Expose underlying program from the LS

src/services/services.ts

@@ -914,6 +914,8 @@ module ts {
 
         getEmitOutput(fileName: string): EmitOutput;
 
+        getProgram(): Program;
+
         getSourceFile(filename: string): SourceFile;
 
         dispose(): void;
@@ -2075,6 +2077,12 @@ module ts {
             }
         }
 
+        function getProgram(): Program {
+            synchronizeHostData();
+
+            return program;
+        }
+
         /**
          * Clean up any semantic caches that are not needed. 
          * The host can call this method if it wants to jettison unused memory.
@@ -5444,6 +5452,7 @@ module ts {
             getFormattingEditsAfterKeystroke,
             getEmitOutput,
             getSourceFile: getCurrentSourceFile,
+            getProgram
         };
     }