Tutorial missing - Use the built-in LITTLEFS library - how to use the library itself

[Sentinel8000]

Im wondering people creating good things for arduino/esp32 but if somebody try as beginner use these fail, because there is no tutorial, description/use case.

Without any description as beginner i have downloaded the library and added to my librarys, i got this errors:

C:\Users\X\Documents\Arduino\libraries\LittleFS_esp32\src\esp_littlefs.c:19:2: warning: #warning ("Use the built-in LITTLEFS library") [-Wcpp]

C:\Users\X\Documents\Arduino\libraries\LittleFS_esp32\src\LITTLEFS.cpp: In member function 'virtual bool LITTLEFSImpl::exists(const char*)':
C:\Users\X\Documents\Arduino\libraries\LittleFS_esp32\src\LITTLEFS.cpp:44:28: error: no matching function for call to 'LITTLEFSImpl::open(const char*&, const char [2])'
File f = open(path, "r");
^
In file included from C:\Users\X\Documents\Arduino\libraries\LittleFS_esp32\src\LITTLEFS.cpp:17:
C:\Users\X\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.2\libraries\FS\src/vfs_api.h:38:17: note: candidate: 'virtual fs::FileImplPtr VFSImpl::open(const char*, const char*, bool)'
FileImplPtr open(const char* path, const char* mode, const bool create) override;
^~~~
C:\Users\X\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.2\libraries\FS\src/vfs_api.h:38:17: note: candidate expects 3 arguments, 2 provided
exit status 1

Use the built-in LITTLEFS library - And?

Im sure need something todo before use, but im not sure without any tutorial.

Im using arduino ide version 1.8.12

Example code from the arduino ide forum:

#define dbg(myFixedText, variableName)
Serial.print( F(#myFixedText " " #variableName"=") );
Serial.println(variableName);

#define dbgi(myFixedText, variableName,timeInterval)
do {
static unsigned long intervalStartTime;
if ( millis() - intervalStartTime >= timeInterval ){
intervalStartTime = millis();
Serial.print( F(#myFixedText " " #variableName"=") );
Serial.println(variableName);
}
} while (false);

#include <FS.h>
#include <LITTLEFS.h>
#define FORMAT_LITTLEFS_IF_FAILED true

String MyEmail = "[email protected]";
String MyPassWord = "thereisnopassword";
String MySecret = "NUX007";

void prepareLittleFS() {
//Start LittleFS
if(!LITTLEFS.begin(FORMAT_LITTLEFS_IF_FAILED)){
Serial.println("LITTLEFS Mount failed");
return;
}
writeDefaultData();
}

void readData() {
File file = LITTLEFS.open("/SavedFile.txt", "r");

if(!file){
Serial.println("No Saved Data!");
writeDefaultData();
Serial.println("writeDefaultData(); done");
}
while(file.available()){
MyEmail = file.readString();
dbg("FileRead:",MyEmail);

MyPassWord = file.readString();
dbg("FileRead:",MyPassWord);

MySecret   = file.readString(); 
dbg("FileRead:",MySecret);

}
file.close();
}

void writeDefaultData() {
File file = LITTLEFS.open("/SavedFile.txt", "w");

MyEmail = "[email protected]";
file.println(MyEmail);

dbg("file.println:",MyEmail);

MyPassWord = "enter_your_password";
file.println(MyPassWord);
dbg("file.println:",MyPassWord);

MySecret = "enter_your_secret";
file.println(MySecret);
dbg("file.println:",MySecret);
delay(1);

file.close();

Serial.println("Write successful");
}

void writeData() {
File file = LITTLEFS.open("/SavedFile.txt", "w");

file.println(MyEmail);
dbg("file.println:",MyEmail);

file.println(MyPassWord);
dbg("file.println:",MyPassWord);

file.println(MySecret);
dbg("file.println:",MySecret);
delay(1);

file.close();

Serial.println("Write successful");
}

void PrintFileNameDateTime() {
Serial.println( F("Code running comes from file ") );
Serial.println( F(FILE) );;
Serial.print( F(" compiled ") );
Serial.print( F(DATE) );
Serial.print( F(" ") );
Serial.println( F(TIME) );
}

void setup() {
Serial.begin(115200);
Serial.println();
Serial.println( F("Setup-Start") );
PrintFileNameDateTime();
dbg("right before prepareLittleFS()",0);
prepareLittleFS();
dbg("right after prepareLittleFS()",0);
readData();

}

void loop() {

}

[ramanraja]

Specifically, there is no documentation on end(). The examples also seem to ignore it.
Is it mandatory to call LittleFS.end() after read/write operations ? If not called, is there a chance of files getting corrupted?