export interface System {

args: string[];

newLine: string;

useCaseSensitiveFileNames: boolean;

write(s: string): void;

readFile(path: string, encoding?: string): string;

writeFile(path: string, data: string, writeByteOrderMark?: boolean): void;

watchFile?(path: string, callback: (path: string) => void): FileWatcher;

resolvePath(path: string): string;

fileExists(path: string): boolean;

directoryExists(path: string): boolean;

createDirectory(path: string): void;

getExecutingFilePath(): string;

getCurrentDirectory(): string;

readDirectory(path: string, extension?: string): string[];

getMemoryUsage?(): number;

exit(exitCode?: number): void;

}

export interface FileWatcher {

close(): void;

}

declare var require: any;

declare var module: any;

declare var process: any;

declare var global: any;

declare var __filename: string;

declare class Enumerator {

public atEnd(): boolean;

public moveNext(): boolean;

public item(): any;

constructor(o: any);

}

export var sys: System = (function () {

function getWScriptSystem(): System {

var fso = new ActiveXObject("Scripting.FileSystemObject");

var fileStream = new ActiveXObject("ADODB.Stream");

fileStream.Type = 2 /*text*/;

var binaryStream = new ActiveXObject("ADODB.Stream");

binaryStream.Type = 1 /*binary*/;

var args: string[] = [];

for (var i = 0; i < WScript.Arguments.length; i++) {

args[i] = WScript.Arguments.Item(i);

}

function readFile(fileName: string, encoding?: string): string {

if (!fso.FileExists(fileName)) {

return undefined;

}

fileStream.Open();

try {

if (encoding) {

fileStream.Charset = encoding;

fileStream.LoadFromFile(fileName);

}

else {

// Load file and read the first two bytes into a string with no interpretation

fileStream.Charset = "x-ansi";

fileStream.LoadFromFile(fileName);

var bom = fileStream.ReadText(2) || "";

// Position must be at 0 before encoding can be changed

fileStream.Position = 0;

// [0xFF,0xFE] and [0xFE,0xFF] mean utf-16 (little or big endian), otherwise default to utf-8

fileStream.Charset = bom.length >= 2 && (bom.charCodeAt(0) === 0xFF && bom.charCodeAt(1) === 0xFE || bom.charCodeAt(0) === 0xFE && bom.charCodeAt(1) === 0xFF) ? "unicode" : "utf-8";

}

// ReadText method always strips byte order mark from resulting string

return fileStream.ReadText();

}

catch (e) {

throw e;

}

finally {

fileStream.Close();

}

}

function writeFile(fileName: string, data: string, writeByteOrderMark?: boolean): void {

fileStream.Open();

binaryStream.Open();

try {

// Write characters in UTF-8 encoding

fileStream.Charset = "utf-8";

fileStream.WriteText(data);

// If we don't want the BOM, then skip it by setting the starting location to 3 (size of BOM).

// If not, start from position 0, as the BOM will be added automatically when charset==utf8.

if (writeByteOrderMark) {

fileStream.Position = 0;

}

else {

fileStream.Position = 3;

}

fileStream.CopyTo(binaryStream);

binaryStream.SaveToFile(fileName, 2 /*overwrite*/);

}

finally {

binaryStream.Close();

fileStream.Close();

}

}

function getNames(collection: any): string[] {

var result: string[] = [];

for (var e = new Enumerator(collection); !e.atEnd(); e.moveNext()) {

result.push(e.item().Name);

}

return result.sort();

}

function readDirectory(path: string, extension?: string): string[] {

var result: string[] = [];

visitDirectory(path);

return result;

function visitDirectory(path: string) {

var folder = fso.GetFolder(path || ".");

var files = getNames(folder.files);

for (let name of files) {

if (!extension || fileExtensionIs(name, extension)) {

result.push(combinePaths(path, name));

}

}

var subfolders = getNames(folder.subfolders);

for (let current of subfolders) {

visitDirectory(combinePaths(path, current));

}

}

}

return {

args,

newLine: "\r\n",

useCaseSensitiveFileNames: false,

write(s: string): void {

WScript.StdOut.Write(s);

},

readFile,

writeFile,

resolvePath(path: string): string {

return fso.GetAbsolutePathName(path);

},

fileExists(path: string): boolean {

return fso.FileExists(path);

},

directoryExists(path: string) {

return fso.FolderExists(path);

},

createDirectory(directoryName: string) {

if (!this.directoryExists(directoryName)) {

fso.CreateFolder(directoryName);

}

},

getExecutingFilePath() {

return WScript.ScriptFullName;

},

getCurrentDirectory() {

return new ActiveXObject("WScript.Shell").CurrentDirectory;

},

readDirectory,

exit(exitCode?: number): void {

try {

WScript.Quit(exitCode);

}

catch (e) {

}

}

};

}

function getNodeSystem(): System {

var _fs = require("fs");

var _path = require("path");

var _os = require('os');

var platform: string = _os.platform();

// win32\win64 are case insensitive platforms, MacOS (darwin) by default is also case insensitive

var useCaseSensitiveFileNames = platform !== "win32" && platform !== "win64" && platform !== "darwin";

function readFile(fileName: string, encoding?: string): string {

if (!_fs.existsSync(fileName)) {

return undefined;

}

var buffer = _fs.readFileSync(fileName);

var len = buffer.length;

if (len >= 2 && buffer[0] === 0xFE && buffer[1] === 0xFF) {

// Big endian UTF-16 byte order mark detected. Since big endian is not supported by node.js,

// flip all byte pairs and treat as little endian.

len &= ~1;

for (var i = 0; i < len; i += 2) {

var temp = buffer[i];

buffer[i] = buffer[i + 1];

buffer[i + 1] = temp;

}

return buffer.toString("utf16le", 2);

}

if (len >= 2 && buffer[0] === 0xFF && buffer[1] === 0xFE) {

// Little endian UTF-16 byte order mark detected

return buffer.toString("utf16le", 2);

}

if (len >= 3 && buffer[0] === 0xEF && buffer[1] === 0xBB && buffer[2] === 0xBF) {

// UTF-8 byte order mark detected

return buffer.toString("utf8", 3);

}

// Default is UTF-8 with no byte order mark

return buffer.toString("utf8");

}

function writeFile(fileName: string, data: string, writeByteOrderMark?: boolean): void {

// If a BOM is required, emit one

if (writeByteOrderMark) {

data = '\uFEFF' + data;

}

_fs.writeFileSync(fileName, data, "utf8");

}

function readDirectory(path: string, extension?: string): string[] {

var result: string[] = [];

visitDirectory(path);

return result;

function visitDirectory(path: string) {

var files = _fs.readdirSync(path || ".").sort();

var directories: string[] = [];

for (let current of files) {

var name = combinePaths(path, current);

var stat = _fs.lstatSync(name);

if (stat.isFile()) {

if (!extension || fileExtensionIs(name, extension)) {

result.push(name);

}

}

else if (stat.isDirectory()) {

directories.push(name);

}

}

for (let current of directories) {

visitDirectory(current);

}

}

}

return {

args: process.argv.slice(2),

newLine: _os.EOL,

useCaseSensitiveFileNames: useCaseSensitiveFileNames,

write(s: string): void {

// 1 is a standard descriptor for stdout

_fs.writeSync(1, s);

},

readFile,

writeFile,

watchFile: (fileName, callback) => {

// watchFile polls a file every 250ms, picking up file notifications.

_fs.watchFile(fileName, { persistent: true, interval: 250 }, fileChanged);

return {

close() { _fs.unwatchFile(fileName, fileChanged); }

};

function fileChanged(curr: any, prev: any) {

if (+curr.mtime <= +prev.mtime) {

return;

}

callback(fileName);

};

},

resolvePath: function (path: string): string {

return _path.resolve(path);

},

fileExists(path: string): boolean {

return _fs.existsSync(path);

},

directoryExists(path: string) {

return _fs.existsSync(path) && _fs.statSync(path).isDirectory();

},

createDirectory(directoryName: string) {

if (!this.directoryExists(directoryName)) {

_fs.mkdirSync(directoryName);

}

},

getExecutingFilePath() {

return __filename;

},

getCurrentDirectory() {

return process.cwd();

},

readDirectory,

getMemoryUsage() {

if (global.gc) {

global.gc();

}

return process.memoryUsage().heapUsed;

},

exit(exitCode?: number): void {

process.exit(exitCode);

}

};

}

if (typeof WScript !== "undefined" && typeof ActiveXObject === "function") {

return getWScriptSystem();

}

else if (typeof module !== "undefined" && module.exports) {

return getNodeSystem();

}

else {

return undefined; // Unsupported host

}

})();