NOTE: There're no correspoind runtime package.
PR: DefinitelyTyped/DefinitelyTyped#68598
First, see main.ts or output of that in main.ts.out.txt. (This is made by bun run ./main.ts > ./main.ts.out.txt)
You can see this part:
// ...
data: {
estree: {
type: 'Program',
// ..
body: [
{
type: 'ExpressionStatement',
expression: {
type: 'JSXFragment',
// ...This is result of parse of MDX {<><span>hi</span></>}.
This shows type JSXFragment is allowed as top level expression of estree.
In JSX, Fragment expression (<>...</>) is also an expression like as JSX normal expression (<Foo>...</Foo>).
Allowed type values are managed by interface extension, so we need to fix @types/estree-jsx.