Migrate from bundlesize to size-limit

[erikras-dinesh-agent]

Migrates from deprecated bundlesize to size-limit for bundle size monitoring.

Changes

• Remove bundlesize dependency
• Add @size-limit/preset-small-lib and size-limit dependencies
• Convert bundlesize configuration to size-limit format
• Add Bundle Size Check job to CI workflow
• Update GitHub Actions to v4 (checkout, setup-node)

Bundle Size Limits

• dist/final-form-focus.umd.min.js: 1kB
• dist/final-form-focus.es.js: 1.5kB
• dist/final-form-focus.cjs.js: 1.5kB

Part of the bundlesize → size-limit migration across all Final Form repos.

Summary by CodeRabbit

• Chores
  • Updated CI workflows to newer tooling for improved stability, security, and compatibility
  • Standardized Node.js runtime to version 22 across all pipelines and builds
  • Strengthened bundle size monitoring and added an automated bundle-size check job with tightened size thresholds for better quality control

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📝 Walkthrough

Walkthrough

GitHub Actions workflow updates: checkout and setup-node pinned to v4, Node.js runtime fixed to 22, and a new "Bundle Size Check" CI job added. package.json migrates bundle-size enforcement from bundlesize to size-limit and updates devDependencies and configuration keys.

Changes

Cohort / File(s)	Summary
CI workflow .github/workflows/ci.yml	Replaced actions/checkout@v2 → @v4, actions/setup-node@v2 → @v4; pinned Node.js to 22 across jobs; added a new "Bundle Size Check" job that checks out, sets up Node 22, installs deps, builds, and runs size-limit.
Bundle size tooling & config package.json	Migrated from bundlesize → size-limit: removed bundlesize devDependency, added size-limit and @size-limit/preset-small-lib, replaced bundlesize config with size-limit, and renamed threshold keys → limit with adjusted values for three bundles.

Sequence Diagram(s)

sequenceDiagram
  participant GH as GitHub Actions
  participant Runner as CI Runner
  participant Repo as Repository
  participant Node as Node.js 22
  participant NPM as Package Manager
  participant Build as Build Step
  participant Size as size-limit

  rect rgba(100,149,237,0.5)
  GH->>Runner: trigger workflow (Bundle Size Check)
  end

  Runner->>Repo: checkout (`actions/checkout@v4`)
  Runner->>Node: setup Node.js 22 (`actions/setup-node@v4`)
  Runner->>NPM: install dependencies (npm ci / install)
  Runner->>Build: run build script
  Runner->>Size: run `size-limit` checks
  Size-->>Runner: report results
  Runner-->>GH: job success/failure

Loading

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐇 I hopped through workflows, bright and spry,
Upgraded nodes and actions high,
Bundles measured with a gentler hand,
size-limit keeps the pack so planned,
I nibble logs and give a cheerful cry.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately and concisely summarizes the main change: migrating the bundlesize tool to size-limit, which is the primary objective of the pull request.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch migrate-to-size-limit

---

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[coderabbitai]

Actionable comments posted: 2

🤖 Fix all issues with AI agents

In @.github/workflows/ci.yml:
- Line 51: The workflow references the older action tag
"codecov/codecov-action@v2.1.0"; update this to the v4 release (e.g.,
"codecov/codecov-action@v4") to match the other v4 upgrades and pull in newer
features/security fixes, then verify the CI run succeeds and adjust any
invocation inputs if the v4 action changed its input names or behavior.

In `@package.json`:
- Around line 74-76: DevDependencies in package.json are out of alphabetical
order; move the entry "@size-limit/preset-small-lib" so devDependencies are
sorted alphabetically (consider ordering entries like
"@size-limit/preset-small-lib", "size-limit", "typescript" appropriately) to
restore the conventional ordering.

[erikras-dinesh-agent]

Fixed all CodeRabbit feedback:

• ✅ Updated codecov action to v4
• ✅ Alphabetized devDependencies

[erikras-dinesh-agent]

@coderabbitai review

[coderabbitai]

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Review triggered.

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