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Result of { ...Array<T> } is assignable to Array<T> #38137

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abliarsar opened this issue Apr 23, 2020 · 2 comments
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Result of { ...Array<T> } is assignable to Array<T> #38137

abliarsar opened this issue Apr 23, 2020 · 2 comments
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@abliarsar
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TypeScript Version: 3.8.3

Search Terms: array, object spread.

Code

const fn = (wut: Array<number>): Array<number> => ({ ...wut})

fn([]).map(() => 1) // No type error, but runtime will crash

Expected behavior: Error
Actual behavior: No error

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@MartinJohns
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Duplicate of #34780.

@DanielRosenwasser DanielRosenwasser added the Duplicate An existing issue was already created label Apr 27, 2020
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This issue has been marked as a 'Duplicate' and has seen no recent activity. It has been automatically closed for house-keeping purposes.

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@DanielRosenwasser @MartinJohns @abliarsar @typescript-bot