More Agent Autonomy Needs Stronger Guardrails: React 19 Linting on ESLint 10

The more autonomy I give coding agents, the more of a repository's expectations need to be executable. I do not want manual review to be the first place a predictable failure is discovered. My projects now have more pre-commit hooks, tests, deterministic checks for project conventions, and small reviewable commits. The checks turn expectations into pass/fail results an agent can act on; the commits keep failures narrow enough to diagnose. Linting is one of those guardrails. This story began when the React linting layer I relied on broke during an ESLint 10 upgrade. I maintain several React applications and wanted to upgrade them to ESLint 10. The upgrade stopped at eslint-plugin-react . ESLint 10 removed deprecated rule-context APIs . The current eslint-plugin-react@7.37.5 release declares support only through ESLint 9 and can crash under ESLint 10 with: TypeError: contextOrFilename.getFilename is not a function The upstream compatibility issue was opened on February 7, 2026. As of August 23, it is still open more than six months later. The pull request , opened on July 30, is also still open. That led me to release @ternaus/eslint-plugin-react : an independent React 19 continuation for ESLint 10. Who this is for The package has a deliberately narrow support matrix: Tool Supported version React 19+ ESLint 10 Biome 2.5.8+ Node.js 22.13, 24, or 26 ESLint config Flat config React 18, ESLint 9, and .eslintrc* are outside the package contract. My setup My projects use Biome as the primary formatter and linter. Biome handles general JavaScript, TypeScript, JSX, DOM, and most React checks. ESLint remains for checks that Biome does not provide, including framework plugins and several React 19 contracts. The setup came from real Next.js and React codebases behind Albumentations.ai , sportscategory.info , and my-roots.me : Next.js 16 React 19 TypeScript ESLint 10 with flat config Biome with the all preset Yarn 4 Node.js 22, 24, and 26 My projects need a smaller rule set: the