Function createDirectoryWatcher

test/fixtures/snapshot/typescript.js:6387–6406

(dirName, dirPath, fallbackOptions)

            };
        }
        function createDirectoryWatcher(dirName, dirPath, fallbackOptions) {
            var watcher = fsWatch(dirName, 1 /* FileSystemEntryKind.Directory */, function (_eventName, relativeFileName) {
                // When files are deleted from disk, the triggered "rename" event would have a relativefileName of "undefined"
                if (!ts.isString(relativeFileName))
                    return;
                var fileName = ts.getNormalizedAbsolutePath(relativeFileName, dirName);
                // Some applications save a working file via rename operations
                var callbacks = fileName && fileWatcherCallbacks.get(toCanonicalName(fileName));
                if (callbacks) {
                    for (var _i = 0, callbacks_1 = callbacks; _i < callbacks_1.length; _i++) {
                        var fileCallback = callbacks_1[_i];
                        fileCallback(fileName, FileWatcherEventKind.Changed);
                    }
                }
            }, 
            /*recursive*/ false, PollingInterval.Medium, fallbackOptions);
            watcher.referenceCount = 0;
            dirWatchers.set(dirPath, watcher);
            return watcher;
        }
    }
    function createFixedChunkSizePollingWatchFile(host) {
        var watchedFiles = [];