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build(deps): upgrade to next 16 and drop the postcss override - #69

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fix/dependabot-transitive-updatesfrom
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build(deps): upgrade to next 16 and drop the postcss override#69
rickstaa wants to merge 3 commits into
fix/dependabot-transitive-updatesfrom
feat/next-16

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@rickstaa

@rickstaa rickstaa commented Sep 8, 2026

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Stacked on #67. Upgrades next and eslint-config-next to 16.3.4, which unpins postcss and removes the need for the postcss override. The esbuild override stays until drizzle-kit 1.0 drops its deprecated loader.

Migration changes: middleware.ts renamed to proxy.ts (same code, new export name); an empty turbopack config marks the webpack watch block as a deliberate --webpack fallback; eslint.config.mjs imports the flat configs directly, so @eslint/eslintrc is gone; tsconfig picks up the jsx and include changes Next 16 applies; agentRules is disabled so next dev stops appending a generated block to CLAUDE.md.

The three React Compiler lint rules new in eslint-plugin-react-hooks 7 (set-state-in-effect, refs, static-components) flag about 40 existing sites and are turned off in the config with a note. Build, lint, typecheck, and vitest pass; the proxy was smoke-tested under CONSOLE_DEV_MOCK.

Next 16 unpins postcss, so the override goes. It also makes Turbopack the
default, retires middleware.ts in favour of proxy.ts, and ships flat
ESLint configs, which removes the FlatCompat shim and @eslint/eslintrc.
The new React Compiler lint rules flag ~40 existing call sites and are
switched off until that refactor lands.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
@rickstaa
rickstaa requested a review from adamsoffer as a code owner September 8, 2026 21:51
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Nothing runs with --webpack; Turbopack is the only bundler in use, so
the block and the turbopack stub that existed to satisfy it both go.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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