JSDoc unexpected type error when spreading array containing different shapes of same type about typescript HOT 3 OPEN

It behaves the same way but you need to make sure to enable strictNullChecks for your JS file: TS Playground

I find it confusing that the TS playground for JS files uses strict: true, strictNullChecks: false. When I see strict: true set as the default I certainly don't go check all the other options to see if they are not opting out of strictness. This is done here: https://github.com/microsoft/TypeScript-Website/blob/eaa8205658445d4df6c0ca04e42fab1019f71df0/packages/sandbox/src/compilerOptions.ts#L21

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Ah yes you're right, the issue only appears when strictNullCheck is false. Here is the updated playground. I wish I could use this as a workaround for this bug, but turning on strictNullCheck gives me even more errors for things I don't want. 🫤

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You can replace your nevers here with undefined and that should fix the problem without you having to turn on strictNullChecks: TS playground

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