#include <LittleFS>

[alka79]

Hello,

The main page says for File System here https://github.com/esp8266/Arduino/blob/master/doc/filesystem.rst

Note: to use any of file system functions in the sketch, add the following include to the sketch:
#include "FS.h"

The note seems to indicate that FS.h will cover both SPIFFS or LitttleFS.

I followed the guide to convert from SPIFFS to LittleFS and got compiler errors :
LittleFS was not declared in this scope.

I finally found that #include <LittleFS.h> instead of <FS.h> solves the issue.

As a side note, it is confusing that Arduino IDE recognises SPIFFS as a keyword and not LittleFS.
keywords.txt is missing for this lib.

Hope it helps,
Al