Assignability between distributive conditional types and their branch type is reversed in contravariant positions

@ahejlsberg ci sta già lavorando.

Dal 30/7/2026.

### 🔎 Search Terms

"conditional type distribution contravariance" "distributive conditional assignability" "variance conditional types"

### 🕗 Version & Regression Information

- This is the behavior in every version I tried, and I reviewed the FAQ for entries about conditional types, distributive conditional types, and variance

### ⏯ Playground Link

https://www.typescriptlang.org/play/?ts=6.0.3#code/C4TwDgpgBAwg9gNwDwBUB8UC8UDeUBOEAhgCZwB2ANiFAB4BcUKUAvgNwBQokUAIgJYBnYPnjJ0WJlAi1gEciUFSA-LESoMjchAQR8nDgDMAruQDGwfhShzhYjQAoijAcNHr0AGigAjRvfQASlwOKCgAenCoAHkAaX91AEEMISgiQUF+AHNyIh9KaGA4NWREqAAfKAAhNFC0qEEiS0FDfgglALQDMMioAAFgQQBaGUgLEfx8OHwSpDLKmqhU8jhgNIzs3PzC4vtkup8GpqFW9r4hEU7OFg4ucGh4chEiDUkHBiZgzAwEOH4STjcaCuS4UZ6vbDMGRyBRKZiqR7giRaHR6AwmcyWay2YCI-AvdBOFwXdxPfEabx+NRkgloYI4Oq9AbDUYQcZ6KYzPEvZINAAWcGMlBIUBWax80HSmRyeQKNl2YPJ82qtTCRCOzVOHUVtO6ESi3LmFRV-MFwt8ko2Mu28up4P2YUOjU1bSUINJSK6HBYQA

### 💻 Code

```ts
type Cov = { readonly x: T };
type DistrCov = T extends T ? Cov : never;

function testCov(a: DistrCov, b: Cov) {
// OK: Cov is assignable to Cov
a satisfies Cov;

// @ts-expect-error Cov is not assignable to Cov
b satisfies DistrCov;
}

function testContra(a: DistrContra, b: Contra) {
// @ts-expect-error Contra should not be assignable to Contra
a satisfies Contra;

// Contra should be assignable to Contra
b satisfies DistrContra;
}
```

Since conditional distribution over a union produces `Contra | Contra | ...`, it should only be assignable in the contravariant direction.

_No response_