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WalkthroughESLint devDependency was updated from ^9.39.2 to ^10.0.0 in two package files: playgrounds/nextjs/package.json and playgrounds/v3/package.json. Each file contains a single-line change to the 🚥 Pre-merge checks | ✅ 2✅ Passed checks (2 passed)
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🤖 Fix all issues with AI agents
In `@playgrounds/v3/package.json`:
- Line 22: Package.json currently pins "eslint": "^10.0.0" while the playground
still uses a legacy .eslintrc.json; migrate the project to a flat config before
upgrading by running the recommended migration command (npx
`@eslint/migrate-config` playgrounds/v3/.eslintrc.json), then add an
eslint.config.js at the repo root that imports or recreates your existing
settings (or use FlatCompat from `@eslint/eslintrc` to bridge shareable configs
like next/core-web-vitals), and ensure ignore patterns from .eslintignore are
moved into the new flat config so that running next lint succeeds with "eslint":
"^10.0.0".
| "@types/react-dom": "^19.2.3", | ||
| "autoprefixer": "^10.4.24", | ||
| "eslint": "^9.39.2", | ||
| "eslint": "^10.0.0", |
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🧩 Analysis chain
🌐 Web query:
ESLint 10 breaking changes eslintrc flat config migration
💡 Result:
ESLint 10: key breaking changes (esp. .eslintrc → flat config)
- Legacy
.eslintrcis fully removed:.eslintrc.*and.eslintignoreare no longer read;ESLINT_USE_FLAT_CONFIGis no longer honored;/* eslint-env */comments are now errors; and several eslintrc-era CLI flags are removed (--no-eslintrc,--env,--rulesdir,--ignore-path,--resolve-plugins-relative-to). [1] - Config lookup changed: ESLint now finds
eslint.config.*starting from each linted file’s directory (not just the current working directory). This enables multiple configs in one run (monorepos), but can change which config gets applied. [1] - Node.js support floor moved: Node < 20.19.0 (and Node 21/23) are unsupported (see exact supported ranges in the release notes). [1]
- Integration/API removals related to legacy config:
loadESLint()always returnsESLint;Linter’sconfigTypecan only be"flat";LegacyESLint(and some other/use-at-your-own-riskexports) are removed. [1]
Migration: .eslintrc → eslint.config.js (flat config)
-
Generate a starting flat config automatically:
npx `@eslint/migrate-config` .eslintrc.json(Works best for
.eslintrcJSON/YAML;.eslintrc.jsis converted from evaluated output and may need more manual cleanup.) [2][3] -
Move ignore patterns from
.eslintignoreinto flat config usingignores(top-level in your exported config array/object). [1][2] -
Replace
env/--envusage withlanguageOptions.globals(andlanguageOptions.ecmaVersion/sourceTypeas needed). [1][2] -
Update plugins & shareable configs:
- Flat config generally expects direct plugin imports (rather than string names + resolver behavior). [1][2]
- If you depend on shareable configs that are still eslintrc-format, use
FlatCompatfrom@eslint/eslintrcto bridge them during migration. [2]
-
Monorepos: re-check where you place configs because of the new per-file lookup. You may want a root
eslint.config.jsplus package-leveleslint.config.jsfiles. [1]
Sources
- [1] ESLint v10.0.0 release notes (eslint.org)
- [2] ESLint “Configuration Migration Guide” (eslintrc → flat config) (eslint.org)
- [3] “Introducing the ESLint Configuration Migrator” (
@eslint/migrate-config) (eslint.org)
Citations:
- 1: https://eslint.org/blog/2026/02/eslint-v10.0.0-released/?utm_source=openai
- 2: https://eslint.org/docs/latest/use/configure/migration-guide?utm_source=openai
- 3: https://eslint.org/blog/2024/05/eslint-configuration-migrator/?utm_source=openai
🏁 Script executed:
# Search for ESLint config files in playgrounds/v3
find playgrounds/v3 -maxdepth 2 \( -name ".eslintrc*" -o -name "eslint.config.*" -o -name ".eslintignore" \) 2>/dev/null
# Check root directory for ESLint configs that might be inherited
find . -maxdepth 1 \( -name ".eslintrc*" -o -name "eslint.config.*" \) 2>/dev/null
# Look for package.json scripts that reference linting
rg -n "eslint|lint" playgrounds/v3/package.json -A 2Repository: tailwindlabs/tailwindcss
Length of output: 284
🏁 Script executed:
# Check the .eslintrc.json file
cat playgrounds/v3/.eslintrc.json
# Verify no flat config exists
ls -la playgrounds/v3/eslint.config.* 2>/dev/null || echo "No eslint.config.* found"Repository: tailwindlabs/tailwindcss
Length of output: 236
Migrate playgrounds/v3 to ESLint flat config before upgrading to v10 (Line 22).
ESLint v10 fully removes legacy .eslintrc.* support. The playground currently uses .eslintrc.json (extending next/core-web-vitals) but has no flat config yet. Upgrading to eslint@^10.0.0 will cause next lint to fail.
Migrate to eslint.config.js using:
npx `@eslint/migrate-config` playgrounds/v3/.eslintrc.jsonThen move ignore patterns and ensure the shareable config is correctly imported (or use FlatCompat from @eslint/eslintrc as a bridge if needed).
🤖 Prompt for AI Agents
In `@playgrounds/v3/package.json` at line 22, Package.json currently pins
"eslint": "^10.0.0" while the playground still uses a legacy .eslintrc.json;
migrate the project to a flat config before upgrading by running the recommended
migration command (npx `@eslint/migrate-config` playgrounds/v3/.eslintrc.json),
then add an eslint.config.js at the repo root that imports or recreates your
existing settings (or use FlatCompat from `@eslint/eslintrc` to bridge shareable
configs like next/core-web-vitals), and ensure ignore patterns from
.eslintignore are moved into the new flat config so that running next lint
succeeds with "eslint": "^10.0.0".
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Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@playgrounds/nextjs/package.json`:
- Line 23: The package.json bump to "eslint": "^10.0.0" will break the legacy
.eslintrc.json; convert the repo ESLint config to a flat config file named
eslint.config.js and remove/stop using .eslintrc.json, migrating the extends
"next/core-web-vitals" to the Next.js flat config integration and re-declare the
two disabled React rules (the same rule names from the .eslintrc.json) as turned
off in the new config; after creating eslint.config.js, verify that running
`next lint` works and that Next.js 16+ flat config integration is used instead
of the old .eslintrc.json.
---
Duplicate comments:
In `@playgrounds/v3/package.json`:
- Line 22: The project lists "eslint": "^10.0.0" but still uses the legacy
.eslintrc.json which is incompatible with ESLint v10; replace the legacy config
by removing .eslintrc.json and adding a flat config file (eslint.config.cjs or
eslint.config.js) at the repo root that exports the new flat configuration (or
an array of configs) and rewire any plugin/processor/config references to the
flat format; ensure your new file is referenced by the linter (update npm
scripts if necessary) and verify rules/plugins/parsers from the old
.eslintrc.json are translated into the flat config format so linting works with
the "eslint": "^10.0.0" dependency declared in package.json.
| "@types/react": "^19.2.14", | ||
| "@types/react-dom": "^19.2.3", | ||
| "eslint": "^9.39.2", | ||
| "eslint": "^10.0.0", |
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🏁 Script executed:
#!/bin/bash
# Check for ESLint config files in playgrounds/nextjs
echo "=== Searching for ESLint configs in playgrounds/nextjs ==="
find playgrounds/nextjs -maxdepth 2 \( -name ".eslintrc*" -o -name "eslint.config.*" -o -name ".eslintignore" \) 2>/dev/null
echo ""
echo "=== Checking root directory for shared ESLint configs ==="
find . -maxdepth 1 \( -name ".eslintrc*" -o -name "eslint.config.*" \) 2>/dev/null
echo ""
echo "=== Listing contents of playgrounds/nextjs ==="
ls -la playgrounds/nextjs/ 2>/dev/null | head -20Repository: tailwindlabs/tailwindcss
Length of output: 928
🏁 Script executed:
cat -n playgrounds/nextjs/.eslintrc.jsonRepository: tailwindlabs/tailwindcss
Length of output: 260
Migrate to flat config before upgrading ESLint to v10.
This playground uses a legacy .eslintrc.json file, which ESLint 10 no longer supports. Upgrading to ^10.0.0 will break the next lint command. Convert the config to eslint.config.js (flat config format) before this upgrade.
The current .eslintrc.json extends next/core-web-vitals and disables two React rules. Verify that the equivalent Next.js 16+ flat config integration supports this setup.
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@playgrounds/nextjs/package.json` at line 23, The package.json bump to
"eslint": "^10.0.0" will break the legacy .eslintrc.json; convert the repo
ESLint config to a flat config file named eslint.config.js and remove/stop using
.eslintrc.json, migrating the extends "next/core-web-vitals" to the Next.js flat
config integration and re-declare the two disabled React rules (the same rule
names from the .eslintrc.json) as turned off in the new config; after creating
eslint.config.js, verify that running `next lint` works and that Next.js 16+
flat config integration is used instead of the old .eslintrc.json.
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🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Duplicate comments:
In `@playgrounds/v3/package.json`:
- Line 22: You bumped ESLint to v10 in package.json ("eslint": "^10.0.0") but
left a legacy .eslintrc.json, which will break next lint; replace the legacy
config with a flat config by adding an eslint.config.js at the project root that
reproduces the rules/plugins/env/settings from playgrounds/v3/.eslintrc.json (or
temporarily pin eslint back to <10), update any referenced parser/plugin
packages if needed, and run next lint to validate the new flat config works with
the project.
Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.
What changed?
✳️ eslint (9.39.2 → 10.0.0) · Repo · Changelog
Release Notes
10.0.0
Does any of this look wrong? Please let us know.
Commits
See the full diff on Github. The new version differs by more commits than we can show here.
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