refactor: replace inline bash with node script in generate-changeset workflow

[binoy14]

Summary

• Moves the changeset generation logic from a ~130-line inline bash script to .github/scripts/generate-changeset.mjs
• Adds setup-node step with Node 24
• Identical behavior, much easier to read and maintain

Test plan

• Verify workflow triggers correctly on a PR with conventional commit title
• Verify changeset is generated with correct bump type and release notes
• Verify changeset removal works for non-bump types (e.g. chore:)
• Verify N/A release notes opt-out works

🤖 Generated with Claude Code

[claude]

Claude finished @binoy14's task in 1m 49s —— View job

---

Review

• Read changed files
• Review for issues

---

Two issues worth fixing:

1. spawnSync null status not handled — .github/scripts/generate-changeset.mjs:192

spawnSync returns status: null when the process is killed by a signal. The current check if (status === 0) would fall through to git commit in that case, causing a confusing error instead of propagating the real failure.

// current
if (status === 0) {
  console.log('No changes to changeset file')
  process.exit(0)
}

// fix
if (status !== 1) {
  // status 0 = no diff, null = signal-killed; either way don't commit
  console.log('No changes to changeset file')
  process.exit(status ?? 1)
}

Fix this →

---

2. git config sets global config instead of local — .github/scripts/generate-changeset.mjs:27-28

Without --local, git config user.name/email writes to the global ~/.gitconfig. On a shared or reused runner this could bleed into other jobs. Use --local to scope it to the repo.

git('config', '--local', 'user.name', 'ecospark[bot]')
git('config', '--local', 'user.email', 'ecospark[bot]@users.noreply.github.com')

Fix this →

[github-actions]

📦 Bundle Stats — @sanity/cli

Compared against chore/auto-changeset-from-pr (22b23d00) · v6.3.1 (npm)

@sanity/cli

Metric	Value	vs chore/auto-changeset-from-pr (22b23d0)	vs v6.3.1
Internal (raw)	2.1 KB	-	-
Internal (gzip)	799 B	-	-
Bundled (raw)	10.95 MB	-	+9.01 MB, +464.9%
Bundled (gzip)	2.06 MB	-	+1.58 MB, +331.9%
Import time	876ms	+16ms, +1.9%	+33ms, +3.9%

bin:sanity

Metric	Value	vs chore/auto-changeset-from-pr (22b23d0)	vs v6.3.1
Internal (raw)	975 B	-	-
Internal (gzip)	460 B	-	-
Bundled (raw)	9.84 MB	-	+9.13 MB, +1287.6%
Bundled (gzip)	1.77 MB	-	+1.60 MB, +940.8%
Import time	2.06s	+40ms, +2.0%	+1.14s, +122.7% ⚠️

🗺️ View treemap · Artifacts

Details

• Import time regressions over 10% are flagged with ⚠️
• Sizes shown as raw / gzip 🗜️. Internal bytes = own code only. Total bytes = with all dependencies. Import time = Node.js cold-start median.

📦 Bundle Stats — @sanity/cli-core

Compared against chore/auto-changeset-from-pr (22b23d00) · v1.3.0 (npm)

Metric	Value	vs chore/auto-changeset-from-pr (22b23d0)	vs v1.3.0
Internal (raw)	92.3 KB	-	+93 B, +0.1%
Internal (gzip)	21.6 KB	-	+28 B, +0.1%
Bundled (raw)	21.53 MB	-	+9.02 MB, +72.0%
Bundled (gzip)	3.41 MB	-	+1.58 MB, +85.9%
Import time	830ms	+10ms, +1.2%	+45ms, +5.7%

🗺️ View treemap · Artifacts

Details

• Import time regressions over 10% are flagged with ⚠️
• Sizes shown as raw / gzip 🗜️. Internal bytes = own code only. Total bytes = with all dependencies. Import time = Node.js cold-start median.

[socket-security]

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

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	github/​actions/​setup-node@​49933ea5288caeca8642d1e84afbd3f7d6820020

View full report

[github-actions]

Coverage Delta

No covered files changed in this PR.

Overall Coverage

Metric	Coverage
Statements	83.1% (±0%)
Branches	72.9% (±0%)
Functions	83.3% (±0%)
Lines	83.5% (±0%)

[github-actions]

Coverage Delta

No covered files changed in this PR.

Overall Coverage

Metric	Coverage
Statements	83.1% (±0%)
Branches	72.9% (±0%)
Functions	83.3% (±0%)
Lines	83.5% (±0%)

[joshuaellis]

nice.