If tsconfig.json contains

{
  "compilerOptions": {
    "noPropertyAccessFromIndexSignature": true,
  }
}

Then any <slot/> tag anywhere in the <template> section causes typescript compilation errors:

test.vue:17:6 - error TS4111: Property 'slot' comes from an index signature, so it must be accessed with ['slot'].
17 <slot />

Reproducible in both vscode UI and via "vue-tsc --noEmit".