fix: differences in downloads embed version

[graphieros]

Follow up to #2833

This fixes 2 imprecisions in the embed-chart:

1. averageWindow data correction was set to 1, instead of 0 (no data correction is to be applied on the embed version).
2. the end date was forced to date.now instead of the same date as the one used in TrendsChart.vue, resulting in a different last value.

To test:

• go to the stats page and open the 'Embed this chart' details under the downloads chart
• the preview chart should have the same shape and last value as the main chart (make sure you have unset any data correction settings)

Other:

• Bump vue-data-ui:
  • 3.21.9 (release notes)
  • 3.21.10 (release notes). This fixes a bug that does not occur with the way our charts are setup, but we stay fresh:)

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
docs.npmx.dev	Ready	Preview, Comment	Jun 20, 2026 7:53am
npmx.dev	Ready	Preview, Comment	Jun 20, 2026 7:53am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
npmx-lunaria	Ignored		Jun 20, 2026 7:53am

[coderabbitai]

📝 Walkthrough

Walkthrough

buildNormalisedTrendsDataset drops the nowMs option, resolving referenceMs via endDateMs ?? Date.now() only. The SVG embed utility gains a dateIsoToUtcMs helper, derives effectiveEndDateMs from the effective end date ISO string, passes it as endDateMs, sets averageWindow to 0, and reuses the computed ISO value for the dash-last-point check. Tests are updated to match. A minor dependency update to vue-data-ui is also included.

Changes

Remove nowMs and align endDateMs usage

Layer / File(s)	Summary
Drop nowMs from buildNormalisedTrendsDataset shared/utils/trends-chart.ts	Removes nowMs from the options type and from the referenceMs fallback chain, leaving options.endDateMs ?? Date.now() as the only resolution path.
Compute effectiveEndDateMs and update SVG embed caller server/utils/embed-downloads-svg.ts	Adds dateIsoToUtcMs helper, computes effectiveEndDateMs from getEffectiveEndDateIso, passes it as endDateMs instead of nowMs: Date.now(), sets averageWindow to 0, and removes the late effectiveEndDateIso reassignment so the earlier value is reused for the dash-last-point decision.
Update tests for nowMs removal test/unit/shared/utils/trends-chart.spec.ts	Removes nowMs from two test invocations, replaces the nowMs-fallback test with a Date.now() spy-based assertion, and updates the weekly-granularity test to expect predictionPoints: 0 and referenceMs from endDateMs.

Possibly related PRs

• npmx-dev/npmx.dev#2833: Both PRs touch the shared trends-chart normalisation logic used by the downloads embed SVG—this PR changes buildNormalisedTrendsDataset's reference timestamp and endDate handling, whilst the retrieved PR refactors the /api/embed/downloads.svg endpoint that depends on those same normalised dataset and configuration inputs.

Suggested reviewers

• alexdln
• ghostdevv

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly addresses the main issue: fixing imprecisions in the downloads embed chart version, which aligns with the changeset objectives.
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.
Description check	✅ Passed	The pull request description clearly relates to the changeset, explaining specific fixes for embed-chart imprecisions including averageWindow correction and end date alignment, matching the code changes.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch embed-chart-fix

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[socket-security]

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

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	vue-data-ui@​3.21.10

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[github-actions]

e18e dependency analysis

No dependency warnings found.