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Property '[Symbol.iterator]' is missing in type 'PartialTuple<ConstructorParams<T>>
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**TypeScript Version:** 3.1 -> 3.7
<!-- Search terms you tried before logging this (so others can find this issue more easily) -->
**Search Terms:**
tuple, mapped tuple
**Code**
```ts
type Constructor = new (...args: any[]) => any;
type ConstructorParams<T extends Constructor> = T extends new (...args: infer P) => any ? P : never;
type PartialTuple<T extends any[]> = {[I in keyof T]: T[I] | undefined}
type ConstructorReturnType<T extends Constructor> =
T extends new (...args: any[]) => infer R ? R : never;
function getClassFactory<T extends Constructor>(type: T) {
type OptionalParams = PartialTuple<ConstructorParams<T>>;
return getFunctionWithOptionalTypes<OptionalParams, ConstructorReturnType<T>>();
}
```
**Expected behavior:**
should compile correctly
**Actual behavior:**
shows error:
>Type 'PartialTuple<ConstructorParams<T>>' does not satisfy the constraint 'any[]'.
> Property '[Symbol.iterator]' is missing in type 'PartialTuple<ConstructorParams<T>>'.
**Playground Link:**
[playground](https://www.typescriptlang.org/play/?ts=3.1.6&ssl=15&ssc=2&pln=6&pc=1#code/LAKAxgNghgzjAEBZAngYWnA3qev5gHsA7GAFwCcBXMUg8gCgAdyDGB5IgUwC54zyAlkQDmAGnjNWAFQDuBXkUoBbAEady4yYykALcpx7wVBAhE5QiASkwBfUHZChSyRp3ipi-arXLwAvPBcMv…
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