Command#1: flutter pub run easy_localization:generate -h
Command#2: flutter pub run easy_localization:generate -S "assets/translations" -O "lib/translations"
Command#3: flutter pub run easy_localization:generate -S "assets/translations" -O "lib/translations" -o "locale_keys.g.dart" 
Command#4: flutter pub run easy_localization:generate -f keys -o locale_keys.g.dart
I have added this command by number wise 
although you can merge all this command into one
command by merging all tags