Thanks for providing much needed assistance @frissdiegurke
Welcome to the land of plugin creation @Doppy !!
I decided to go with applying the compile-step to all client-side scripts options.
Nonetheless this might be nice to have
Post your plugin.json maybe it has a syntax error. Also did you put your theme in node_modules and activate it from the ACP?
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I'll have to do some more testing. Thank you for your help.
@Jelena You're welcome, didn't look in the plugin file. glad you've got it working,