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⚡ Bolt: Zero-Allocation ISO Date Slicing in Release Formatter - #1308

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jules-bolt-iso-date-slice-3510327677754348650
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jules-bolt-iso-date-slice-3510327677754348650

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@alehar9320

@alehar9320 alehar9320 commented Sep 15, 2026 •

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What

Replaces date.toISOString().split('T')[0] with date.toISOString().slice(0, 10) in formatReleaseDate.

Why

date.toISOString() produces standard ISO 8601 strings formatted as YYYY-MM-DDTHH:mm:ss.sssZ. Splitting on 'T' allocates an intermediate 2-element array on every release date formatting call. Slicing directly extracts the 10-character YYYY-MM-DD substring without dynamic array allocation or garbage collection pressure on Cloudflare Worker edge runtimes.

Impact

  • Zero heap/array allocations during date string formatting per release item.
  • Reduced GC pressure on Cloudflare Worker edge SSR requests rendering releases.

How to verify

  • Run npm run test to execute all unit tests in src/__tests__/github-releases.test.ts.
  • Run npm run format:check and npm run lint to verify code style and quality standards.

PR created automatically by Jules for task 3510327677754348650 started by @alehar9320

Summary by CodeRabbit

  • Refactor
    • Improved release date formatting efficiency while preserving the existing YYYY-MM-DD output.
    • Reduced unnecessary processing during date formatting.

Replace `date.toISOString().split('T')[0]` with `date.toISOString().slice(0, 10)` in `src/utils/github-releases.ts` to extract the YYYY-MM-DD date substring directly without temporary two-element string array allocation per call on Cloudflare Worker edge SSR. Update `.Jules/bolt.md` with critical learning.

Co-authored-by: alehar9320 <5390430+alehar9320@users.noreply.github.com>
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alehar9320 temporarily deployed to jules-bolt-iso-date-slice-3510327677754348650 - astro-cloudflare-personal-website-web-service PR #1308 September 15, 2026 00:41 — with Render Destroyed
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Review Change StackReview Change Stack

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 28d2e4eb-39f7-46ff-a714-95b3a490abcd

📥 Commits

Reviewing files that changed from the base of the PR and between 903d441 and c5c6981.

📒 Files selected for processing (2)
  • .Jules/bolt.md
  • src/utils/github-releases.ts

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📝 Walkthrough

Walkthrough

Changes

Date formatting refactor

Layer / File(s) Summary
Update release date formatting
.Jules/bolt.md, src/utils/github-releases.ts
formatReleaseDate extracts the YYYY-MM-DD prefix with slice(0, 10) instead of split('T')[0]. The existing output remains unchanged. The action log records the refactor.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Refactor

Merge Risk: ⚪ Minimal · up to c5c69

The release date format and invalid-input behavior remain unchanged, so the change is ready to merge.

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly identifies the main change: replacing array-based ISO date splitting with zero-allocation slicing in the release formatter.
Docstring Coverage ✅ Passed Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files. (1 skipped: 1 …
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.
✨ Finishing Touches 💡 1
🛠️ Fix failing CI checks 💡
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  • Commit on current branch
📝 Generate docstrings
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  • Commit on current branch
🧪 Generate unit tests (beta)
  • Create PR with unit tests
  • Commit unit tests in branch jules-bolt-iso-date-slice-3510327677754348650

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🔧 ESLint

If the error stems from missing dependencies, add them to the package.json file. For unrecoverable errors (e.g., due to private dependencies), disable the tool in the CodeRabbit configuration.

src/utils/github-releases.ts

typescript-eslint does not support TS 7.0.
Please see https://devblogs.microsoft.com/typescript/announcing-typescript-7-0/#running-side-by-side-with-typescript-6.0 to run typescript-eslint using the TS 6 API.
See also typescript-eslint/typescript-eslint#10940 for tracking typescript-eslint's support for TS >=7.1
typescript-eslint does not support TS 7.0.
Please see https://devblogs.microsoft.com/typescript/announcing-typescript-7-0/#running-side-by-side-with-typescript-6.0 to run typescript-eslint using the TS 6 API.
See also typescript-eslint/typescript-eslint#10940 for tracking typescript-eslint's support for TS >=7.1

Oops! Something went wrong! :(

ESLint: 10.10.0

Error [ERR_INTERNAL_ASSERTION]: This is caused by either a bug in Node.js or incorrect usage of Node.js internals.
Please open an issue with this stack trace at https://github.com/nodejs/node/issues

at assert (node:internal/assert:11:11)
at loadCJSModuleWithModuleLoad (node:internal/modules/esm/translators:323:3)
at ModuleWrap.<anonymous> (node:internal/modules/esm/translators:231:7)
at ModuleJob.run (node:internal/modules/esm/module_job:437:25)
at async node:internal/modules/esm/loader:639:26
at async dynamicImportConfig (/.eslint-tmp/node_modules/eslint/lib/config/config-loader.js:185:17)
at async loadConfigFile (/.eslint-tmp/node_modules/eslint/lib/config/config-loader.js:275:9)
at async ConfigLoader.calculateConfigArray (/.eslint-tmp/node_modules/eslint/lib/config/config-loader.js:594:23)
at async `#calculateConfigArray` (/.eslint-tmp/node_modules/eslint/lib/config/config-loader.js:369:19)
at async Promise.all (index 0)

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@codecov

codecov Bot commented Sep 15, 2026

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Bundle Report

Changes will decrease total bundle size by 562.07kB (-48.89%) ⬇️. This is within the configured threshold ✅

Detailed changes
Bundle name Size Change
molecular-mars-esm 587.7kB -562.07kB (-48.89%) ⬇️

Affected Assets, Files, and Routes:

view changes for bundle: molecular-mars-esm

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@alehar9320-bot

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HARD ABORT — Jules farm restack of the Bolt formatReleaseDate .slice(0,10) micro-tweak (.Jules/bolt.md + src/utils/github-releases.ts only). Same class as #1294/#1293/#1280/#1263/#1246/#1225/#1206. Overlaps open Dual-path #1204 tip 854866c7 (github-releases / visitor-changelog / release-summary). Closing unmerged as draft. Soft dims N/A.

@jules Do not restack this ISO date-slicing / github-releases subset again. Leave release-formatter tweaks to #1204. Do not reopen this PR.

@codecov

codecov Bot commented Sep 15, 2026

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Codecov Report

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

📢 Thoughts on this report? Let us know!

@alehar9320-bot
alehar9320-bot marked this pull request as draft September 15, 2026 00:43
@alehar9320-bot

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HARD ABORT close (draft). Same Bolt ISO-date farm as #1294/#1263; overlaps Dual-path #1204. Do not reopen / Jules-restack.

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