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[Bug] Generic type extending an Array can not be used as rest params #38767

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bogdan opened this issue May 25, 2020 · 1 comment
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[Bug] Generic type extending an Array can not be used as rest params #38767

bogdan opened this issue May 25, 2020 · 1 comment
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@bogdan
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bogdan commented May 25, 2020

TypeScript Version: 3.9.3

Search Terms:

  • Rest element type
  • Generics

Code

type E<T extends any[]> = [...T]

Expected behavior:

No compilation error.

Actual behavior:

2574: A rest element type must be an array type.

Playground Link:

https://www.typescriptlang.org/play?#code/C4TwDgpgBAogPAFShAHsCA7AJgZygQwxAG0BdAPigF4piA6BhUgbgChWg
@ahejlsberg
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Duplicate of #26113.

@ahejlsberg ahejlsberg added the Duplicate An existing issue was already created label May 25, 2020
@bogdan bogdan closed this as completed May 26, 2020
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@bogdan @ahejlsberg