Intellisense does not appear in JSX attributes for union types

[NickHeiner]

TypeScript Version: Nightly

Search Terms: intellisense jsx union

Code

import React from 'react';

type Exclusive = {
    /**
     * Original description
     */
    a: boolean;
    b?: never;
} | {
    /**
     * Never description
     */
    a?: never;
    b: boolean;
}

const Component: React.FC<Exclusive> = () => <div></div>;
Component({
    a: true
});
<Component a />;

Expected behavior: The field description for a shows up in intellisense.

Actual behavior: It does not.

Object literal at a normal function call looks good:

However, the description does not show up for JSX:

When writing using autocomplete to enter a new field:

Interestingly, JSX works in this case.

Playground Link: link

Related Issues:

• Visual Studio Code intellisense on React component using typescript with union types #27211
• Intellisense concatenates field description from subtypes #38848