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[isTypeReadonly] Unions are always marked as readonly #4418

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accepting prsGo ahead, send a pull request that resolves this issuebugSomething isn't workingpackage: type-utilsIssues related to the @typescript-eslint/type-utils package
@RebeccaStevens

Description

@RebeccaStevens
  • I have tried restarting my IDE and the issue persists.
  • I have updated to the latest version of the packages.
  • I haveread the FAQ and my problem is not listed.

Repro

typeTestType=string[]|number[]
isTypeReadonly(checker,type,{})

Expected Result

isTypeReadonly should returnfalse

Actual Result

isTypeReadonly returnstrue for any union

Additional Info

Predicate always returntrue:

t=>
seenTypes.has(t)||
isTypeReadonlyRecurser(checker,t,options,seenTypes),
);

Versions

packageversion
@typescript-eslint/type-utils5.9.0
@typescript-eslint/type-utils5.9.0
TypeScript4.5.4
node17.1.0

Also note the error in the template inVersions:@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

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    accepting prsGo ahead, send a pull request that resolves this issuebugSomething isn't workingpackage: type-utilsIssues related to the @typescript-eslint/type-utils package

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