Repo: v6 branch regression for adding to JSX.IntrinsicAttributes in typecheck task #7166
Description
Suggestion
On the v6 branch, we now get typecheck (tsc) complaints in ast-spec's fixture for augmenting JSX.IntrinsicElements:
~/repos/typescript-eslint/packages/ast-spec $ yarn typecheck
yarn run v1.22.19
$ tsc -p tsconfig.json --noEmit
src/jsx/JSXNamespacedName/fixtures/component-dashed/fixture.tsx:8:24 - error TS2339: Property 'foo' does not exist on type 'JSX.IntrinsicElements'.
8 const componentBasic = <foo />;
~~~~~~~
src/jsx/JSXNamespacedName/fixtures/component-dashed/fixture.tsx:9:25 - error TS2339: Property 'foo-bar:baz-bam' does not exist on type 'JSX.IntrinsicElements'.
9 const componentDashed = <foo-bar:baz-bam />;
~~~~~~~~~~~~~~~~~~~
Found 2 errors in the same file, starting at: src/jsx/JSXNamespacedName/fixtures/component-dashed/fixture.tsx:8
It happens both for traditional names (e.g. foo) and for TypeScript 5.1's new namespaced names (e.g. 'foo-bar:baz-bam') added in #7088. So I don't think it's specific to TS 5.1's namespace changes.
But... why is this happening? Why is the fixture not allowing augmentation of JSX.IntrinsicElements?
I'm 80% confident this is a silly little mistake I made in merging main -> v6, but can't figure it out... :sob