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feat: build @nuxt/module-builder using rolldown#730

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DamianGlowala wants to merge 14 commits intonuxt:mainfrom
DamianGlowala:feat/rolldown
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feat: build @nuxt/module-builder using rolldown#730
DamianGlowala wants to merge 14 commits intonuxt:mainfrom
DamianGlowala:feat/rolldown

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📚 Description

This moves building the Nuxt module builder library itself from unbuild to rolldown. Building userland modules with it using rolldown is the next step.

Co-authored-by: Copilot <copilot@github.com>
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pkg-pr-new Bot commented Apr 30, 2026

Open in StackBlitz

npm i https://pkg.pr.new/@nuxt/module-builder@730

commit: f718fb5

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coderabbitai Bot commented Apr 30, 2026

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ℹ️ Review info
⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 521543a8-91b4-4d63-a087-edac944b839f

📥 Commits

Reviewing files that changed from the base of the PR and between 00f8542 and f718fb5.

⛔ Files ignored due to path filters (1)
  • pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml
📒 Files selected for processing (1)
  • package.json
📝 Walkthrough

Walkthrough

Removed the Unbuild export from build.config.ts (no build config remains there). package.json scripts changed to use rolldown -c for build, added build:watch, simplified dev:prepare, enabled ESLint caching and added lint:fix; Node engine constraint was tightened. Added runtime dev dependencies rolldown and rolldown-plugin-dts. Added new rolldown.config.ts exporting a Rolldown config with inputs ./src/cli.ts and ./src/index.ts, Node target, a bare-imports external pattern, ESM .mjs output naming, and DTS generation via rolldown-plugin-dts. Updated .gitignore to include .eslintcache.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check name Status Explanation
Title check ✅ Passed The title clearly and specifically describes the main change: migrating the build process from unbuild to rolldown for the @nuxt/module-builder package.
Description check ✅ Passed The description is directly related to the changeset, explaining the migration from unbuild to rolldown and indicating future plans for userland modules.
Docstring Coverage ✅ Passed No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.

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  • Create PR with unit tests

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@rolldown.config.ts`:
- Around line 17-22: Add the missing trailing commas to satisfy the linter: in
the rolldown config object add a trailing comma after the dts() entry inside the
plugins array (plugins: [ dts(), ]) and add a trailing comma after the
entryFileNames property value inside the output object (output: {
entryFileNames: '[name].mjs', }), leaving the existing plugins, dts(), output
and entryFileNames identifiers unchanged.
🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

  • Push a commit to this branch (recommended)
  • Create a new PR with the fixes

ℹ️ Review info
⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 6f0c2a97-c234-4eba-9e76-715a4720292e

📥 Commits

Reviewing files that changed from the base of the PR and between cfb45fb and cf23fac.

⛔ Files ignored due to path filters (1)
  • pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml
📒 Files selected for processing (3)
  • build.config.ts
  • package.json
  • rolldown.config.ts
💤 Files with no reviewable changes (1)
  • build.config.ts

Comment thread rolldown.config.ts Outdated
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socket-security Bot commented Apr 30, 2026

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff Package Supply Chain
Security
Vulnerability Quality Maintenance License
Addedrolldown@​1.0.0951007899100
Addedrolldown-plugin-dts@​0.23.29910010096100

View full report

Comment thread rolldown.config.ts Outdated
Comment on lines +7 to +14
input: Object.fromEntries(
globSync('src/**/*.ts').map(file => [
path.relative('src', file.slice(0, file.length - path.extname(file).length))
.split(path.sep)
.join('/'),
path.resolve(file),
]),
),
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we should only need cli + index entries, right?

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@DamianGlowala DamianGlowala May 1, 2026

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Ideally only these two, but rolldown wasn't bundling dynamic imports for some reason.

This approach aligns with https://rolldown.rs/reference/InputOptions.input#in-depth

LMK if you're aware of a better solution.

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🧹 Nitpick comments (1)
package.json (1)

58-59: Move build-only rolldown packages to devDependencies.

rolldown and rolldown-plugin-dts are used exclusively in rolldown.config.ts and have no runtime imports. Keeping them in dependencies unnecessarily increases the install surface for consumers.

Proposed dependency move
   "dependencies": {
@@
-    "rolldown": "^1.0.0-rc.18",
-    "rolldown-plugin-dts": "^0.23.2",
     "tinyglobby": "^0.2.16",
@@
   "devDependencies": {
+    "rolldown": "^1.0.0-rc.18",
+    "rolldown-plugin-dts": "^0.23.2",
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@package.json` around lines 58 - 59, Move the build-only packages "rolldown"
and "rolldown-plugin-dts" from dependencies into devDependencies in
package.json; edit package.json to remove the "rolldown" and
"rolldown-plugin-dts" entries under "dependencies" and add identical version
entries under "devDependencies" (preserving the versions "^1.0.0-rc.18" and
"^0.23.2"), then run an install to verify lockfile updates.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In `@package.json`:
- Around line 58-59: Move the build-only packages "rolldown" and
"rolldown-plugin-dts" from dependencies into devDependencies in package.json;
edit package.json to remove the "rolldown" and "rolldown-plugin-dts" entries
under "dependencies" and add identical version entries under "devDependencies"
(preserving the versions "^1.0.0-rc.18" and "^0.23.2"), then run an install to
verify lockfile updates.

ℹ️ Review info
⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: d64bff2a-e743-424f-a48f-74b47a353ff0

📥 Commits

Reviewing files that changed from the base of the PR and between cf23fac and b8dd9cf.

⛔ Files ignored due to path filters (1)
  • pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml
📒 Files selected for processing (3)
  • .gitignore
  • package.json
  • rolldown.config.ts
✅ Files skipped from review due to trivial changes (1)
  • .gitignore
🚧 Files skipped from review as they are similar to previous changes (1)
  • rolldown.config.ts

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2 participants