[pull] canary from vercel:canary#912
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pull[bot] merged 7 commits intocode:canaryfrom Mar 25, 2026
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## What? Converting from Set->Array is not needed as it's only used to iterate over the list. Avoids the overhead of converting this.
## What? The chunkloading instrumentation causes a GC root because of writing to `globalThis.__next_require__` / `globalThis.__next_chunk_load__`. Splitting it into a separate function reduces the scope being retained in memory. Switch onHeaders to use for loop which is faster.
## What? Converting from `req.headers` to `Headers` is expensive. Here it's only used to check/read headers only, so directly using the object when it's available is better.
## What? Using `charCodeAt` is faster than startWith for this case.
## What? Currently the lockfile patching is always triggered eagerly but it's only awaited when it fails to load. The patching still affects builds that don't need it. This changes that. --------- Co-authored-by: Vercel <vercel[bot]@users.noreply.github.com>
#91840) When AI agents run `create-next-app` with explicit flags like `--typescript --tailwind --eslint --app --src-dir`, the CLI still enters interactive mode and prompts for any unspecified options: ``` ➜ npx create-next-app my-app --typescript --tailwind --eslint --app --src-dir --use-pnpm ✔ Would you like to use React Compiler? … No / Yes ✔ Would you like to customize the import alias (`@/*` by default)? … No / Yes ? Would you like to include AGENTS.md to guide coding agents to write up-to-date Next.js code? › No / Yes ``` Agents can sometimes answer these interactive prompts correctly, but often they can't. When they fail to navigate the prompts, they fall back to scaffolding the project themselves from scratch — generating files based on stale training data. This means they might initialize an app using deprecated patterns or pin to an older version of Next.js (e.g. 15) instead of the latest. Using `create-next-app` non-interactively is the best way to ensure agents always produce up-to-date scaffolding. Previously, `hasProvidedOptions` only skipped the initial "use recommended defaults?" meta-prompt but still showed individual prompts for each missing option. Now when any config flags are provided, all remaining options use the recommended defaults without prompting. The resolved defaults are printed to stdout so the caller knows exactly what was assumed and which flags to pass to override: ``` Using defaults for unprovided options: --eslint ESLint (use --biome for Biome, --no-eslint for None) --no-react-compiler No React Compiler (use --react-compiler for React Compiler) --agents-md AGENTS.md (use --no-agents-md for No AGENTS.md) --import-alias "@/*" To customize, re-run with explicit flags. ``` The `displayConfig` array is extended with a `flags` field so this output is auto-generated from the same source of truth used for the interactive prompts. Existing behavior for `--yes`, CI mode, and fully interactive mode (no flags) is unchanged.
… webpack (#91909) ## Description Documents the CSS decimal precision difference between Turbopack and webpack in the Turbopack docs page under "Known gaps with webpack". Turbopack uses Lightning CSS which outputs 5 digits of decimal precision for numeric CSS values, while webpack uses 10 digits. This applies to both plain CSS and Sass/SCSS output. Closes #91862
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