Does Espruino support SPIFFS file system now on ESP8266/ESP32 ?

@Wilberforce @jumjum
ESP32 Board: widora v5.0https://world.taobao.com/item/5382098013­68.htm
SD Card Adapter: Catalex Micro SD Card Adapterhttps://detail.tmall.com/item.htm?id=416­90559539&spm=a1z09.2.0.0.816EuT&_u=61fd9­1teef0
Wiring:

| Orange |  Black |  Blue  | White  | Yellow | Green | 
| 3V3    |  GND   |  IO5   | IO18   | IO23   | IO19  | ESP32 Board      |
| VCC    |  GND   |   CS   |  SCK   | MOSI   | MISO  | SD Card Adaptern |

Esrupino: master branch
env vars: export USE_FILESYSTEM=1
IDE: ESPRUINO WEB IDE
Javascript:

/*
| SPI  | MOSI | MISO | CLK | SS/CS | PLATFORM      |
| SPI1 | 13   | 12   | 14  | 15    | ESP8266/ESP32 |
| SPI2 | 23   | 19   | 18  | 5     | ESP32 only    |
*/
var opts = {sck:18, miso:19, mosi:23};
SPI2.setup(opts);

E.connectSDCard(SPI2, 5 /*CS*/);
var fs = require("fs");

// list files on SD card
console.log("\nFiles on SD Card -->\n");
console.log(fs.readdirSync());
// read a exitsting file on SD card
console.log("\nContent of example.txt : -->\n");
console.log(fs.readFileSync("example.txt­"));
// creat a file
fs.writeFile("test.txt", "Hello world!");
fs.appendFileSync("test.txt", " I'm Esrpusino.");
// list files on SD card
console.log("\nFiles on SD Card -->\n");
console.log(fs.readdirSync());
// read text.txt created before on SD card
console.log("\nContent of test.txt : -->\n");
console.log(fs.readFileSync("test.txt"))­;
// list files on SD card
console.log("\nFiles on SD Card -->\n");
console.log(fs.readdirSync("mydir"));
// read text2.txt in /mydir on SD card
console.log("\nContent of test2.txt : -->\n");
console.log(fs.readFileSync("mydir/test2­.txt"));

Content of SD Card before running the codes:
/EXAMPLE.txt
/mydir/test2.txt

output in left hand side of WEB IDE:

>WARNING: jshReset(): To implement - reset of i2c
 _____                 _
|   __|___ ___ ___ _ _|_|___ ___
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v91.2721 Copyright 2016 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
>
Files on SD Card -->
[
  "System Volume Information",
  "EXAMPLE.TXT",
  "._.Trashes",
  ".Trashes",
  ".Spotlight-V100",
  "mydir"
 ]
Content of example.txt : -->
A1234567890abcdefghigklmnopqrstuvwxyz
Files on SD Card -->
[
  "System Volume Information",
  "EXAMPLE.TXT",
  "._.Trashes",
  "test.txt",
  ".Trashes",
  ".Spotlight-V100",
  "mydir"
 ]
Content of test.txt : -->
Hello world! I'm Esrpusino.
Files on SD Card -->
[
  ".",
  "..",
  "test2.txt"
 ]
Content of test2.txt : -->
Hello, I'm in directory /mydir.
=undefined

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