Can't define variables in inline event handler: "Property does not exist on type"

[scscgit]

When defining a variable like this:

@click="() => {
  const x = 1
  if (x === 1) {
  }
}"

it yields two errors:

• 'x' is declared but its value is never read. ts(6133)
• Property 'x' does not exist on type 'MyComponent'. ts(2339)

The code using such variable works correctly, and I've been using this syntax since Vue 2 with Vetur. After migrating to Vue 3 with Volar, this type safety and inference in VS Code fails.

[so1ve]

Notes:

When using script setup only, everything is good
When using script lang="ts", only 'x' is declared but its value is never read. ts(6133)
When using script setup lang="ts", 'x' is declared but its value is never read. ts(6133) and Property 'x' does not exist on type '...'. ts(2339)