Why is TypeScript rejecting Quasar alias?

Why does my @ alias not work with TypeScript?

I have these settings in my quasar.config.ts:

    build: {
      target: {
        browser: 'baseline-widely-available',
        node: 'node22',
      },
typescript: {
strict: true,
vueShim: true,
// extendTsConfig (tsConfig) {}
},
alias: {
'@': '/src',
},

and this setting in tsconfig.json:

{
  "extends": "./.quasar/tsconfig.json"
}

The app is running correctly but I have error:

Cannot find module '@/features/theme/lib' or its corresponding type declarations.

The imports with @ working, components successfully importing.