[isTypeReadonly] Conditional types are always marked as readonly #4420
Description
- I have tried restarting my IDE and the issue persists.
- I have updated to the latest version of the packages.
- I have read the FAQ and my problem is not listed.
Repro
type TestType<T> = T extends number[] ? string[] : number[];isTypeReadonly(checker, type, {})Expected Result
isTypeReadonly should return false
Actual Result
isTypeReadonly returns true for any conditional type.
Additional Info
Conditional types aren't being tested for and are thus being treated as primitives.
typescript-eslint/packages/type-utils/src/isTypeReadonly.ts
Lines 201 to 205 in 97c0e86
Versions
| package | version |
|---|---|
@typescript-eslint/type-utils |
5.9.0 |
@typescript-eslint/type-utils |
5.9.0 |
TypeScript |
4.5.4 |
node |
17.1.0 |
Also note the error in the template in Versions: @typescript-eslint/type-utils's version is requested twice. I assume there is supposed to be only one or one is supposed to be @typescript-eslint/experimental-utils