00dd1f0609
* Add isIntersectionConstituent to relation key isIntersectionConstituent controls whether relation checking performs excess property and common property checks. It is possible to fail a relation check with excess property checks turned on, cache the result, and then skip a relation check with excess property checks that would have succeeded. #33133 provides an example of such a program. Fixes #33133 the right way, so I reverted the fix at #33213 Fixes #34762 (by reverting #33213) Fixes #33944 -- I added the test from #34646 * Update comments in test
5 lines
158 B
TypeScript
5 lines
158 B
TypeScript
export type U = { kind?: 'A', a: string } | { kind?: 'B' } & { b: string };
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type Ex<T, U> = T extends U ? T : never;
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declare let x: Ex<U, { kind?: 'A' }>
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x.a
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