refactor(deps): lift Next 15→16, vitest 2→4, ESLint 9→10, TS 5→6, @types/node 20→26 - #16
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…pes/node 20→26 - next ^15.0.0 → ^16 (16.3.3), eslint-config-next ^15.0.0 → ^16 - vitest ^2.1.5 → ^4 (4.1.11) — plain single-project config, no workspace file; 6/6 tests pass unchanged - eslint ^9 → ^10 (10.9.1): eslint.config.mjs rewritten from FlatCompat (@eslint/eslintrc, now dropped from devDeps) to eslint-config-next v16's native flat exports - lint script: `next lint` (removed in Next 16) → `eslint .` - settings.react.version pinned to '19' — eslint-plugin-react's 'detect' calls getFilename(), removed in ESLint 10 - typescript ^5 → ^6 (6.0.3), @types/node ^20 → ^26 (26.4.0) - tsconfig: Next 16 build set jsx→react-jsx and added .next/dev/types to include (mandatory Next 16 changes) Verified locally against a schema-migrated Postgres (same shape as CI): format:check, lint, typecheck, 6/6 tests, db:migrate, next build all green. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WqKqMnHQHSmkGFfc5t7Rxn
The first lockfile write hit two npm 11 bugs in one file: the nested esbuild@0.28.2 tree under vitest was missing its per-platform optional packages entirely (CI: "Missing: @esbuild/linux-x64@0.28.2 from lock file"), and after a full regeneration the same 26 nested entries were written WITHOUT "optional": true, making npm ci fail EBADPLATFORM on @esbuild/aix-ppc64. Regenerated from scratch, then marked the 26 nested @esbuild/* platform entries optional (matching how npm recorded the identical entries under tsx). Verified: rm -rf node_modules && npm ci green, verify + build green. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WqKqMnHQHSmkGFfc5t7Rxn
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Claude-Session: https://claude.ai/code/session_01WqKqMnHQHSmkGFfc5t7Rxn Co-authored-by: Mao Nakamoto <41178744+maonakamoto@users.noreply.github.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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What moved
Traps handled
next lintremoved in Next 16 → lint script is noweslint ..eslint.config.mjsrewritten from FlatCompat to eslint-config-next v16's native flat exports (core-web-vitals+typescript);@eslint/eslintrcdevDep removed.version: 'detect'crashes under ESLint 10 (getFilename is not a function) → pinnedsettings.react.version: '19'.vitest.config.ts), mocks unaffected — all 6 tests pass unchanged.jsx: react-jsx(mandatory) and added.next/dev/types/**/*.tsto include; committed as reformatted by prettier.middleware.ts;next.config.tsis empty — no removed options.Verification
Ran locally against a schema-migrated scratch Postgres (same shape CI's service container provides):
npm run format:check✓npm run lint✓ (0 errors)npm run typecheck✓npm test✓ 6/6npm run db:migrate✓npm run build✓ (Next 16.3.3, all routes compile)🤖 Generated with Claude Code
https://claude.ai/code/session_01WqKqMnHQHSmkGFfc5t7Rxn