.env.vault.local |top|

It tells the decryption engine which environment (development, staging, or production) the local machine should be mimicking or pulling keys from.

:Use the local build command to generate your encrypted vault files locally. npx dotenv-vault@latest local build .env.vault.local

: This file (which should never be committed) contains the DOTENV_KEY required to decrypt the vault for specific environments. .env.vault.local