resources.Concat with js - slice interface not supported in concat

[ainstushar]

@asagray

toCSS

See this:

Module mounts incompatible with PostCSS import?

See https://gohugo.io/hugo-modules/configuration/#module-config-mounts. When the mounts config was introduced in Hugo 0.56.0, we were careful to preserve the existing staticDir and similar configuration to make sure all existing sites just continued to work. But you should not have both. So if you add a mounts section you should make it complete and remove the old staticDir etc. settings. That is immediately followed by this example: [[module.mounts]] source = "content" …

Did you mount assets folder using the new modules system?

Try adding this to config.toml
[[module.mounts]]
source = “assets”
target = “assets”