This is piece of TypeScript code that I use:
class StringUtils {
  // SiwachGaurav's version from http://stackoverflow.com/questions/1144783/replacing-all-occurrences-of-a-string-in-javascript
  static replaceAll(str: string, find: string, replace: string): string {
    return str.replace(new RegExp(find.replace(/[-\/\\^$*+?.()|[\]{}]/g,'\\$&'),'g'), replace);
  }
  // Returns file path with OS-native slashes
  static toNativePath(str: string): string {
    var os = ExternalInterfaces.require_os();
    if (os.platform() == "win32")
      // Convert Unix to Windows
      return StringUtils.replaceAll(str, "/", "\\");
    else
      // Convert Windows to Unix
      return StringUtils.replaceAll(str, "\\", "/");
  }
  // Returns file path with POSIX-style slashes
  static toPosixPath(str: string): string {
    // Convert Windows to Unix
    return StringUtils.replaceAll(str, "\\", "/");
  }
}
- Check if two paths point to the same - StringUtils.toPosixPath("..\\foo.txt") == StringUtils.toPosixPath("../foo.txt")
 
- Pass path to a - node.jsfile I/O
 - StringUtils.toNativePath("../foo.txt")
 - StringUtils.toNativePath("..\\foo.txt")