Why does the key generation behavior differ based on the JSON file?

[quyetnv-mlhn]

Hello,
I have 10 JSON key files for different languages.

When I add a new key only to the en-US file and run the command:
dart run easy_localization:generate -S assets/translations -O lib/gen -o locale_keys.g.dart -f keys
no keys are generated.

However, when I add a new key to the es-ES file and run the same command, the key is generated.

I would like to understand the logic behind this behavior. Could you please explain how the command determines which JSON file to use?

Thank you in advance!

[quyetnv-mlhn]

Sorry, add argument -s to resolve this