packages/nuxt/src/head/runtime/components.ts (1)

333-340: ⚠️ Potential issue | 🟡 Minor

Guard <Style> slot content with type check instead of truthiness check.

The current code uses a truthiness guard followed by an unsafe as string cast, which allows two issues:

1. Non-string values pass through to textContent at runtime in production builds (the dev-time check is insufficient).
2. Empty string slots are skipped entirely, which can leave stale CSS if a slot changes from non-empty to empty.

The input.style![idx] = style assignment is also inside the conditional block, so it never executes for falsy or non-string content.

Replace the truthiness check with a type guard to ensure only strings are assigned and the style entry is always recorded:

Suggested fix

       const style = normalizeProps(props, key) as UnheadStyle
       const textContent = slots.default?.()?.[0]?.children
-      if (textContent) {
-        if (import.meta.dev && typeof textContent !== 'string') {
+      if (typeof textContent === 'string') {
+        style.textContent = textContent
+      } else if (import.meta.dev && textContent != null) {
           console.error('<Style> can only take a string in its default slot.')
-        }
-        input.style![idx] = style
-        style.textContent = textContent as string
       }
+      input.style![idx] = style
       update()
       return null

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@packages/nuxt/src/head/runtime/components.ts` around lines 333 - 340, Replace
the truthiness guard on the slot value with a proper type check: compute
textContent from slots.default?.()?.[0]?.children, then always set
input.style![idx] = style (so the style entry is recorded) and set
style.textContent to the string only when typeof textContent === 'string'; if
it's not a string set style.textContent to an empty string (or undefined) to
avoid stale CSS. Keep the import.meta.dev console.error path to warn in dev when
typeof textContent !== 'string'. Update the logic around
normalizeProps/UnheadStyle, slots.default, input.style, style.textContent and
idx accordingly.