Function addOrDeleteFileOrDirectory

test/fixtures/snapshot/typescript.js:115361–115394

(fileOrDirectory, fileOrDirectoryPath)

            return host.realpath ? host.realpath(s) : s;
        }
        function addOrDeleteFileOrDirectory(fileOrDirectory, fileOrDirectoryPath) {
            var existingResult = getCachedFileSystemEntries(fileOrDirectoryPath);
            if (existingResult !== undefined) {
                // Just clear the cache for now
                // For now just clear the cache, since this could mean that multiple level entries might need to be re-evaluated
                clearCache();
                return undefined;
            }
            var parentResult = getCachedFileSystemEntriesForBaseDir(fileOrDirectoryPath);
            if (!parentResult) {
                return undefined;
            }
            // This was earlier a file (hence not in cached directory contents)
            // or we never cached the directory containing it
            if (!host.directoryExists) {
                // Since host doesnt support directory exists, clear the cache as otherwise it might not be same
                clearCache();
                return undefined;
            }
            var baseName = getBaseNameOfFileName(fileOrDirectory);
            var fsQueryResult = {
                fileExists: host.fileExists(fileOrDirectoryPath),
                directoryExists: host.directoryExists(fileOrDirectoryPath)
            };
            if (fsQueryResult.directoryExists || hasEntry(parentResult.directories, baseName)) {
                // Folder added or removed, clear the cache instead of updating the folder and its structure
                clearCache();
            }
            else {
                // No need to update the directory structure, just files
                updateFilesOfFileSystemEntry(parentResult, baseName, fsQueryResult.fileExists);
            }
            return fsQueryResult;
        }
        function addOrDeleteFile(fileName, filePath, eventKind) {
            if (eventKind === ts.FileWatcherEventKind.Changed) {
                return;