TS5087

error TS5087: A labeled tuple element is declared as rest with a ‘...‘ before the name, rather than before the type.

Broken Code ❌

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type Operation = "+" | "-";

type CalcInput = [operation: Operation, numbers: ...number[]];

Fixed Code ✔️

We have to move the rest operator to the label name:

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type CalcInput = [operation: Operation, ...numbers: number[]];