Comment by Y-bar

> If there were linters

Available and kept up-to-date. I found for Python, PHP:

https://github.com/j13k/yaml-lint

https://github.com/adrienverge/yamllint

Also .net:

https://github.com/aaubry/YamlDotNet

And NPM/js:

https://github.com/stoplightio/spectral