Unable to infer parameters for generic constructor/functions with a distributive conditional type

まだ誰も着手していません。

### 🔎 Search Terms

generic constructor, generic function, branded string, `ConstructorParameters`, `Parameters`, unable to infer.

### 🕗 Version & Regression Information

- This is the behavior in every version I tried, and I reviewed the FAQ

### ⏯ Playground Link

https://www.typescriptlang.org/play/?#code/KYDwDg9gTgLgBAbwL4G4CwAoTBLAdjYKAMwEMBjYOAfQFkSxFM44iIIAuROEzgRgCYAzHCSZRWDDACeYSjQgATAK4AbYAGUlAIwAqMygF44AIi0koxuADIuWqCVwLOMKEsqpMmabLh0GR2nprOAAlYDJoBQAeeWU1TV19ABpbFRIAC04AZxc8AHMRAD5PSX04BL1ZAHFgGCimcu1KylACRyy4HKh8pIa-OFbgdtDwyKiK5LglXABrXAgAd1xC3oxCuCMJn0Hh6bnF3EwAfi5vYCPOLfdgvwBtK4BdTE5cYAA3QnQJAHpvuB10tgOkC4DB0pQALYQHKdFwkbB5dIwVhQBbmBRwNFSOAASTgZAcLARSiglAgSngMAg+IgEMoVNBgOBWSybnYXjKOmAOQACuYSHSCFAOkY+fZBYQslEojoBiA2goOsZWBBLAAfXyKVQaJr6QoACnMeUuuuqtRlKT8hQAlBt1m8INgFMUML9mHAAHonV4fKAlN146AIvAkFQqbFDCLTIXADHYeALePpbj4tIsuAqbAzelM9kYBThNKk1MkdNcnIyuUKpUq9WauI6xKydYIBoRXBdJRkKlQQ1QY2NJvAGp1HSW+g2r7iDk+cswADCEA7Li7PbFAtqko2cEXy9c3eg64lwqiZwgRH+3JghS+buYXrgPsIQA

### 💻 Code

```ts
export {};

interface _Map {
foo: { a: 123 }
}

type ModuleSubType = "bar" & { brand: true };

type Map = _Map & Record

type SubTypeGet<
SubType extends string,
Map extends Record,
> = SubType extends unknown
? { type?: SubType } & Map[SubType]
: never;

// This is the most straightforward way I can figure out to come to this issue:
type TestParameters = Parameters<(arg: SubTypeGet) => void>
// ^? never

// I originally encountered it with a class like this:
declare class Test {
constructor(arg: SubTypeGet);
}

type TestConstructorParameters = ConstructorParameters;
// ^? never
```

### 🙁 Actual behavior

`Parameters` fails to infer anything.

### 🙂 Expected behavior

`Parameters` should infer _something,_ probably `[arg: { type?: ModuleSubType | undefined; } | ({ type?: "foo" | undefined; } & { a: 123; })]` as it would if the function/class were instantiated.

### Additional information about the issue

_No response_

リンクされたPlaygroundの再現コードを最初の入口として使用し、ジェネリック関数とコンストラクターの例について、分配条件型が Parameters と ConstructorParameters を通じてどのように流れるかを調べます。両方のユーティリティが期待される動作に一致する never ではないパラメータタプルを推論し、既存の再現コードが失敗しなくなれば完了です。

索引モデルが issue の本文から書いたものです。