Ignore anything starting with ".git"

Fixes #29782

src/compiler/sys.ts

@@ -326,6 +326,9 @@ namespace ts {
                 : FileWatcherEventKind.Changed;
     }
 
+    /*@internal*/
+    export const ignoredPaths = ["/node_modules/.", "/.git"];
+
     /*@internal*/
     export interface RecursiveDirectoryWatcherHost {
         watchDirectory: HostWatchDirectory;
@@ -371,7 +374,7 @@ namespace ts {
             else {
                 directoryWatcher = {
                     watcher: host.watchDirectory(dirName, fileName => {
-                        if (isInNodeModulesStartingWithDot(fileName)) return;
+                        if (isIgnoredPath(fileName)) return;
 
                         // Call the actual callback
                         callbackCache.forEach((callbacks, rootDirName) => {
@@ -428,7 +431,7 @@ namespace ts {
                     const childFullName = getNormalizedAbsolutePath(child, parentDir);
                     // Filter our the symbolic link directories since those arent included in recursive watch
                     // which is same behaviour when recursive: true is passed to fs.watch
-                    return !isInNodeModulesStartingWithDot(childFullName) && filePathComparer(childFullName, normalizePath(host.realpath(childFullName))) === Comparison.EqualTo ? childFullName : undefined;
+                    return !isIgnoredPath(childFullName) && filePathComparer(childFullName, normalizePath(host.realpath(childFullName))) === Comparison.EqualTo ? childFullName : undefined;
                 }) : emptyArray,
                 existingChildWatches,
                 (child, childWatcher) => filePathComparer(child, childWatcher.dirName),
@@ -455,8 +458,8 @@ namespace ts {
             }
         }
 
-        function isInNodeModulesStartingWithDot(path: string) {
-            return isInPath(path, "/node_modules/.");
+        function isIgnoredPath(path: string) {
+            return some(ignoredPaths, searchPath => isInPath(path, searchPath));
         }
 
         function isInPath(path: string, searchPath: string) {