# ESLint v10 eslintrc removed flat config v10 official

Status: search-observed
Product: ESLint
Last verified: 2026-06-25
Canonical HTML: https://gitdocs.org/fix/eslint-v10-eslintrc-removed-flat-config-v10-official
Machine JSON: https://gitdocs.org/api/fixes/eslint-v10-eslintrc-removed-flat-config-v10-official.json

## Exact Symptom

See the observed Codex queries below.

## Diagnosis

The old package/config name is syntactically valid, but current tool packaging and discovery rules live in external release documentation.

## Fix

```
Verifier checks the current package identity/config format and a real transformed output. Check the exact intended lint findings, not merely process exit 0.
```

## Avoid

- Changing local code without checking the current external contract.
- Retrying the same install, build, or API call with no version/source change.
- Applying a broad unsafe bypass when a narrow compatibility fix is available.

## Observed Codex Queries

- ESLint v10 eslintrc removed flat config v10 official
- site:eslint.org eslintrc deprecated flat config v10
- ESLint flat config eslintrc deprecated removed version 10

## Sources

- ESLint v10.0.0: https://eslint.org/blog/2026/02/eslint-v10.0.0-released/