Handle extra file extensions when wild card directory watch is invoked (microsoft#41018)

Fixes microsoft#40495

Author: sheetalkamat

src/compiler/watchPublic.ts

@@ -635,7 +635,7 @@ namespace ts {
 
         function reloadFileNamesFromConfigFile() {
             writeLog("Reloading new file names and options");
-            const result = getFileNamesFromConfigSpecs(configFileSpecs, getNormalizedAbsolutePath(getDirectoryPath(configFileName), currentDirectory), compilerOptions, parseConfigFileHost);
+            const result = getFileNamesFromConfigSpecs(configFileSpecs, getNormalizedAbsolutePath(getDirectoryPath(configFileName), currentDirectory), compilerOptions, parseConfigFileHost, extraFileExtensions);
             if (updateErrorForNoInputFiles(result, getNormalizedAbsolutePath(configFileName, currentDirectory), configFileSpecs, configFileParsingDiagnostics!, canConfigFileJsonReportNoInputFiles)) {
                 hasChangedConfigFileParsingErrors = true;
             }
@@ -748,6 +748,7 @@ namespace ts {
                         fileOrDirectoryPath,
                         configFileName,
                         configFileSpecs,
+                        extraFileExtensions,
                         options: compilerOptions,
                         program: getCurrentBuilderProgram(),
                         currentDirectory,

src/testRunner/unittests/tscWatch/watchApi.ts

@@ -121,6 +121,11 @@ namespace ts.tscWatch {
             );
             const watch = createWatchProgram(watchCompilerHost);
             checkProgramActualFiles(watch.getProgram().getProgram(), [mainFile.path, otherFile.path, libFile.path]);
+
+            const other2 = `${projectRoot}/other2.vue`;
+            sys.writeFile(other2, otherFile.content);
+            checkSingleTimeoutQueueLengthAndRun(sys);
+            checkProgramActualFiles(watch.getProgram().getProgram(), [mainFile.path, otherFile.path, libFile.path, other2]);
         });
     });
 }