Using the implementation of FS and SD included as part of the Oak package in a single sketch was not possible, due to them having conflicting file definitions. This was fixed as part of a commit on the ESP8266 Arduino core (https://github.com/esp8266/Arduino/commit/18297458bea82419b27d603d18cba81160829675). This commit simply imports those fixes, and was going to include some other minor additions that have occurred since, but that will break as there are underlying dependencies.
Using the implementation of FS and SD included as part of the Oak package in a single sketch was not possible, due to them having conflicting file definitions. This was fixed as part of a commit on the ESP8266 Arduino core (https://github.com/esp8266/Arduino/commit/18297458bea82419b27d603d18cba81160829675). This commit simply imports those fixes, and was going to include some other minor additions that have occurred since, but that will break as there are underlying dependencies.