Respond to CR

src/compiler/resolutionCache.ts

@@ -716,7 +716,7 @@ namespace ts {
                     }
                     // prevent saving an open file from over-eagerly triggering invalidation
                     if (resolutionHost.fileIsOpen(fileOrDirectoryPath)) {
-                        return;
+                        return false;
                     }
                     // Ignore emits from the program
                     if (isEmittedFileOfProgram(resolutionHost.getCurrentProgram(), fileOrDirectoryPath)) {

src/compiler/watch.ts

@@ -691,7 +691,7 @@ namespace ts {
             hasChangedAutomaticTypeDirectiveNames = true;
             scheduleProgramUpdate();
         };
-        compilerHost.fileIsOpen = () => false;
+        compilerHost.fileIsOpen = returnFalse;
         compilerHost.maxNumberOfFilesToIterateForInvalidation = host.maxNumberOfFilesToIterateForInvalidation;
         compilerHost.getCurrentProgram = getCurrentProgram;
         compilerHost.writeLog = writeLog;