That's because the original PR dropped the support for type spread and kept only the object spread. Also to my understanding, the PR currently mentioned under the "shipped" link for TypeScript (https://github.com/Microsoft/TypeScript/pull/28234) is concerned only about spread in object literals, not types.
More examples: TypeScript vs. Flow (the Flow version uses exact types, which is usually a prerequisite for using object spread).
I have changed the relevant row for object type spread and added a new section section under "Flow-only concepts".
niieani
commented
4 years ago
Refs: #2, #46
If you look at the example mentioned in #2, you will see it still raises an error with TS v3.8.2: https://www.typescriptlang.org/play/index.html#src=interface%20Congealed%3CT%2C%20U%3E%20%7B%0D%0A%20%20%20%20...T%0D%0A%20%20%20%20...U%0D%0A%7D
That's because the original PR dropped the support for type spread and kept only the object spread. Also to my understanding, the PR currently mentioned under the "shipped" link for TypeScript (https://github.com/Microsoft/TypeScript/pull/28234) is concerned only about spread in object literals, not types.
More examples: TypeScript vs. Flow (the Flow version uses exact types, which is usually a prerequisite for using object spread).
I have changed the relevant row for object type spread and added a new section section under "Flow-only concepts".