ERROR Pre-transform error: [unimport] failed to find "useUserSession" imported from "#imports"

I just added

srcDir: 'app/'

srcDir: 'app/'

to my nuxt.config.ts, in the hope to get a faster devserver and now I get

ERROR  Pre-transform error: [unimport] failed to find "useUserSession" imported from "#imports"

ERROR  Pre-transform error: [unimport] failed to find "useUserSession" imported from "#imports"