error compiling assets with npm run watch

[sbaum2s]

I get this error on Linux:

ERROR in ./resources/js/Pages/Dashboard/Index.vue?vue&type=script&lang=js (./node_modules/babel-loader/lib/index.js??clonedRuleSet-5.use[0]!./node_modules/vue-loader/dist/index.js??ruleSet[0].use[0]!./resources/js/Pages/Dashboard/Index.vue?vue&type=script&lang=js) 2:0-37
Module not found: Error: Can't resolve '@/Shared/Layout' in '.../resources/js/Pages/Dashboard'

In fact the Shared folder is on the same directory level als Pages, so the error message is right but where to configure this? (i dont even know how the @ syntax works) No hints for this can be found in the docs nor in the github demo app which is running well locally. But i want to get it running following the instructions in the docs.

[sbaum2s]

Lost in complexity of steps