Para instalar o Visual Studio Code no Fedora 27, na linha de comando, digite:

1. Instalando a chave e o repositório.

sudo rpm --import https://packages.microsoft.com/keys/microsoft.asc
$ sudo sh -c 'echo -e "[code]\nname=Visual Studio Code\nbaseurl=https://packages.microsoft.com/yumrepos/vscode\nenabled=1\ngpgcheck=1\ngpgkey=https://packages.microsoft.com/keys/microsoft.asc" > /etc/yum.repos.d/vscode.repo'

2. Atualizando o cache dos pacotes e instalando o Visual Studio Code.

sudo dnf check-update
$ sudo dnf install code