---
# Install's prerequisites, like fonts, image libraries, vim, screen, python-dev and gcc 

- include_tasks: debian_family.yml
  when: ansible_os_family == 'Debian'

- include_tasks: redhat_family.yml
  when: ansible_os_family == "RedHat"

- name: Install yarn
  command: npm install -g yarn
  become: yes
  become_user: root
...