Where is ESP8266 SPIFFS File Editor?

[chupocro]

Here in issue #102 file ESP8266 SPIFFS File Editor has been mentioned and someone posted a modified code starting with:

<!-- This file has been written by Me-No-Dev
see https://github.com/me-no-dev/ and is part
of the sample code of ESPAsyncWebServer
see https://github.com/me-no-dev/ESPAsyncWebServer -->

The comment says the code is part of the sample code of ESPAsyncWebServer but I can't find it anywhere.

Where is it?