Bug: Missing peer dependencies

[latin-1]

Before You File a Bug Report Please Confirm You Have Done The Following...

• [X] I have tried restarting my IDE and the issue persists.
• [X] I have updated to the latest version of the packages.
• [X] I have searched for related issues and found none that matched my issue.
• [X] I have read the FAQ and my problem is not listed.

Relevant Package

typescript-eslint

Playground Link

No response

Repro Code

{
  "devDependencies": {
    "eslint": "9.4.0",
    "typescript": "5.4.5",
    "typescript-eslint": "8.0.0-alpha.25"
  }
}

Package @typescript-eslint/utils@npm:8.0.0-alpha.25 [a23fe] is requested to provide typescript by its descendants

@typescript-eslint/utils@npm:8.0.0-alpha.25 [a23fe]
└─ @typescript-eslint/typescript-estree@npm:8.0.0-alpha.25 [fd6b8] (via *)
   └─ ts-api-utils@npm:1.3.0 [e2004] (via >=4.2.0)

✘ Package @typescript-eslint/utils@npm:8.0.0-alpha.25 [a23fe] does not provide typescript.

Package @typescript-eslint/type-utils@npm:8.0.0-alpha.25 [47dfd] is requested to provide eslint by its descendants

@typescript-eslint/type-utils@npm:8.0.0-alpha.25 [47dfd]
└─ @typescript-eslint/utils@npm:8.0.0-alpha.25 [a23fe] (via ^8.57.0 || ^9.0.0)
   └─ @eslint-community/eslint-utils@npm:4.4.0 [fd6b8] (via ^6.0.0 || ^7.0.0 || >=8.0.0)

✘ Package @typescript-eslint/type-utils@npm:8.0.0-alpha.25 [47dfd] does not provide eslint.

Package typescript-eslint@npm:8.0.0-alpha.25 [14e3a] is requested to provide eslint by its descendants

typescript-eslint@npm:8.0.0-alpha.25 [14e3a]
├─ @typescript-eslint/eslint-plugin@npm:8.0.0-alpha.25 [a23fe] (via ^8.57.0 || ^9.0.0)
│  └─ @typescript-eslint/utils@npm:8.0.0-alpha.25 [a23fe] (via ^8.57.0 || ^9.0.0)
│     └─ @eslint-community/eslint-utils@npm:4.4.0 [fd6b8] (via ^6.0.0 || ^7.0.0 || >=8.0.0)
├─ @typescript-eslint/parser@npm:8.0.0-alpha.25 [a23fe] (via ^8.57.0 || ^9.0.0)
└─ @typescript-eslint/utils@npm:8.0.0-alpha.25 [a23fe] (via ^8.57.0 || ^9.0.0)
   └─ ...

✘ Package typescript-eslint@npm:8.0.0-alpha.25 [14e3a] does not provide eslint.

ESLint Config

No response

tsconfig

No response

Expected Result

Installed without any warnings.

Actual Result

yarn install reports unmet peer dependencies.

Additional Info

No response

Versions

package	version
typescript-eslint	8.0.0-alpha.25
TypeScript	5.4.5
ESLint	9.4.0

[bradzacher]

This seems like a really weird constraint for yarn to enforce - to force a package to declare a peer dependency for its transient peer dependencies.

For the record the dependencies haven't changed since v7 AFAIK. So it should fail in the same way.

[Josh-Cena]

@bradzacher The requirement for Yarn is that every transitive peer dependency needs to either be "passed on" as peer dependency or declared as dependency (so all packages further up the chain don't need to declare it anymore)

[latin-1]

(maybe off-topic) BTW, yarn and pnpm (but not npm >= 7, which appears to have a bug^1) allow you to declare a dependency in both dependencies and peerDependencies. The one in dependencies will act as a fallback.

[LFCavalcanti]

Hi,

Same problem here today but using NPM.

My dev dependencies versions:

"devDependencies": {
    "@typescript-eslint/eslint-plugin": "^7.12.0",
    "@typescript-eslint/parser": "^7.12.0",
    "eslint": "^9.4.0",
  }

When I try to run npm install:

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: project-name@0.1.0
npm ERR! Found: eslint@9.4.0
npm ERR! node_modules/eslint
npm ERR!   dev eslint@"^9.4.0" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer eslint@"^8.56.0" from @typescript-eslint/parser@7.12.0
npm ERR! node_modules/@typescript-eslint/parser
npm ERR!   dev @typescript-eslint/parser@"^7.12.0" from the root project
npm ERR!   peer @typescript-eslint/parser@"^7.0.0" from @typescript-eslint/eslint-plugin@7.12.0
npm ERR!   node_modules/@typescript-eslint/eslint-plugin
npm ERR!     dev @typescript-eslint/eslint-plugin@"^7.12.0" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.

[bradzacher]

@LFCavalcanti youre using eslint v9 with typescript-eslint v7. That pairing is not valid - typescript-eslint v7 only supports eslint v8.

[LFCavalcanti]

@LFCavalcanti youre using eslint v9 with typescript-eslint v7. That pairing is not valid - typescript-eslint v7 only supports eslint v8.

Yeah, I managed to fix that updating to this:

"devDependencies": {
    "@typescript-eslint/eslint-plugin": "^7.12.0",
    "@typescript-eslint/parser": "^7.12.0",
    "eslint": "^8.57.0",
  }

I already tried fixing the Eslint version to ^8.57.0 but the error persisted.

The catch was updating Eslint first, then the parser and finally the plugin.

Thanks!

[callmeberzerker]

@LFCavalcanti youre using eslint v9 with typescript-eslint v7. That pairing is not valid - typescript-eslint v7 only supports eslint v8.

What's the meaning behind this statement? Does typescript-eslint plan to ever support ESLint 9 or? I see the documentation references flat config which is for ESLint 9 - but peer dependency says v8.x.x. Also aside from the warning everything works?

[JoshuaKGoldberg]

Flat config support !== ESLint 9 support. You can support one without the other.

Issues on our side:

• 7694: supported as of v7

• 8211: available only in the v8 branch, currently in beta

[facucarbonel]

@bradzacher

@LFCavalcanti youre using eslint v9 with typescript-eslint v7. That pairing is not valid - typescript-eslint v7 only supports eslint v8.

current eslint version is v9, how do I use typescript-eslint if the current version is v7? is there an alpha version or something like that?

[JoshuaKGoldberg]

✨ https://github.com/typescript-eslint/typescript-eslint/issues/8211 -> https://typescript-eslint.io/blog/announcing-typescript-eslint-v8-beta ✨

[bradzacher]

I'm going to lock this issue as the conversation is going way off topic. We shall investigate the peer deps.