When an imported css file refers to an image in a node_module folder

[strarsis]

The node_modules folder is only used for building the assets using nodejs-based tools (like webpack),
it shouldn’t bei included in the theme!
Run composer install before activating the theme. But as I see in your latest post, you are zipping the theme - so you can also invoke composer install before zipping and adding the vendor/ folder to the theme ZIP.

Does this theme ZIP build script help you (pick the one for the right Sage version (9 / 10))?

Deployment on Shared Hosting

IMHO it could be quite helpful to add an “eject” task to Sage that automatically creates a minimal theme ZIP as build artifact. Note: node_modules/ is only required for building the theme - it is not needed and should not be needed by the theme during runtime. If there are any files that should be available for the theme, either add them using webpack (e.g. imported SASS, url(...)) or copy them from node_modules/ into dist/ or - for some cases - resources/. For Sage 10 themes: #!/bin/sh echo …