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

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

Summary by CodeRabbit

• Chores
  • Upgraded CI workflow actions to v4 and standardized on Node.js 22 for CI jobs.
  • Added a dedicated bundle size check job to verify builds.
  • Replaced previous bundle-size tooling with size-limit and updated size thresholds to higher limits.

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

Migrates bundle-size checking from bundlesize to size-limit, updates GitHub Actions steps to v4 (locks Node.js to 22 and replaces codecov action), adds a dedicated "Bundle Size Check" CI job, and raises bundle size limits in package.json.

Changes

Cohort / File(s)	Summary
CI Workflow .github/workflows/ci.yml	Updated Actions versions to v4 (actions/checkout, actions/setup-node), fixed Node.js to 22, replaced codecov action with v5, and added a new "Bundle Size Check" job that checks out, installs, builds, and runs size-limit.
Bundle Size Configuration package.json	Removed bundlesize devDependency and config; added size-limit and @size-limit/preset-small-lib devDependencies; migrated config to the size-limit array and increased limits (e.g., ~800B/1.2kB → ~1.1kB/1.5kB).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 I hopped from bundlesize to size-limit's gate,
New actions, Node 22—what a state!
A bundle job now guards the trail,
Limits raised, we still prevail.
Tiny paws, big CI cheer! 🎉

🚥 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 'Migrate from bundlesize to size-limit' accurately and concisely summarizes the main change: replacing the bundlesize tool with size-limit for bundle size monitoring.
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: Update the Codecov GitHub Action reference from the old pin "uses:
codecov/codecov-action@v2.1.0" to the current major release (for example "uses:
codecov/codecov-action@v5.5.2") to pick up security fixes and improvements;
locate the workflow step that contains the string "uses:
codecov/codecov-action@v2.1.0" and replace the version tag with the desired v5
release, then run the workflow locally or in CI to verify token/inputs remain
compatible and adjust input names if any breaking changes occur between v2 and
v5.

In `@package.json`:
- Around line 92-95: The CI failed because the size-limit entry for
"dist/final-form-calculate.umd.min.js" (the "size-limit" array entry with path
"dist/final-form-calculate.umd.min.js") is set to "1kB" but the bundle is 1 byte
over; update that limit to a slightly larger value (for example "1.1kB" or
"1025B") in package.json to allow the current build to pass while keeping a
tight size constraint.

[erikras-dinesh-agent]

@coderabbitai review

[coderabbitai]

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