changing the code to automatically inlcude the correct Little-filesystem library ESP8266 <LittleFS.h> / ESP32)<LITTLEFS.h> about esp-fs-webserver HOT 3 CLOSED

Since version 2.0.0 of ESP32 Arduino core all sources related to LittleFS was renamed in order to match with ESP8266 implementation, so there is no need to use

#ifdef ESP8266
#include <LittleFS.h>
#define FILESYSTEM LittleFS
ESP8266WebServer server(80);

#elif defined(ESP32)
#include <LITTLEFS.h>
#define FILESYSTEM LITTLEFS
WebServer server(80);
#endif

Probably you are using an old version of core (latest is 2.0.3).
Regarding the different name of webserver class, it's handled directly in the sources of library since some time and you can use the generic name WebServerClass.

#include <LittleFS.h>
#define FILESYSTEM LittleFS
WebServerClass server(80);

from esp-fs-webserver.

Probably you are using an old version of core (latest is 2.0.3).

2.0.3 doesn't make sense to me. Is this a type and you mean ESP8266 3.0.2

2.0.3

3.0.2

which version do you mean ESP32 my Boardmanager tells me
newest version for ESP32 is

newest version for ESP8266 is

from esp-fs-webserver.

You are using an old JSON link in your IDE preferences for ESP32.
Probably you've got it from an outdated tutorial instead from Espressif official documentation.
You can find the updated information for Arduino IDE at this address

from esp-fs-webserver.