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[Snyk] Security upgrade eslint from 8.27.0 to 9.0.0 #113

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[Snyk] Security upgrade eslint from 8.27.0 to 9.0.0 #113

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2 changes: 1 addition & 1 deletion package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -44,7 +44,7 @@
"css-minimizer-webpack-plugin": "^3.2.0",
"dotenv": "^10.0.0",
"dotenv-expand": "^5.1.0",
"eslint": "^8.23.1",
"eslint": "^9.0.0",
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@devin-ai-integration devin-ai-integration bot Mar 22, 2026

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🔴 ESLint 9 upgrade breaks linting: .eslintrc config and .eslintignore are ignored by default

ESLint 9 switched to the "flat config" system (eslint.config.js) by default. The project's .eslintrc configuration file and .eslintignore file will no longer be automatically loaded when running eslint . or eslint . --fix (see package.json:107-108). This means all custom rules, extends (wesbos/typescript), parser options, plugin settings, and ignore patterns defined in .eslintrc and .eslintignore will be silently dropped. ESLint will either error out (if it can't find a valid flat config) or lint with no project-specific rules applied.

Additionally, several eslint config/plugin dependencies are incompatible with ESLint 9:

  • eslint-config-react-app@7.0.1
  • eslint-config-wesbos@3.0.2
  • eslint-config-airbnb@19.0.4
  • eslint-config-airbnb-typescript@16.2.0
  • eslint-plugin-react-hooks@4.6.0
  • eslint-webpack-plugin@3.1.1

To fix this, either migrate to the flat config format and update all plugins, or stay on ESLint 8.

Suggested change
"eslint": "^9.0.0",
"eslint": "^8.23.1",
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@cursor cursor bot Mar 22, 2026

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ESLint 9 upgrade breaks incompatible plugin ecosystem

High Severity

Upgrading eslint to ^9.0.0 (resolved to 9.39.4) without upgrading the companion ESLint ecosystem packages will break linting and builds. @typescript-eslint/eslint-plugin and @typescript-eslint/parser at ^5.38.0 require ESLint 8 (need v8+). eslint-webpack-plugin at ^3.1.1 doesn't support ESLint 9 (need v4.2.0+). eslint-config-react-app at ^7.0.1 doesn't support ESLint 9's flat config. The project's eslintConfig in package.json uses the legacy extends key, which is unsupported in ESLint 9's default flat config mode.

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"eslint-config-airbnb": "^19.0.4",
"eslint-config-airbnb-typescript": "^16.2.0",
"eslint-config-prettier": "^8.5.0",
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