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perf: preload always-loaded cloud sync and analytics modules - #586

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bolt/optimize-date-formatting-4472865672635472095
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perf: preload always-loaded cloud sync and analytics modules#586
seonghobae wants to merge 4 commits into
developfrom
bolt/optimize-date-formatting-4472865672635472095

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@seonghobae

@seonghobae seonghobae commented Aug 22, 2026

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What

Add modulepreload hints for cloud-sync.js and analytics.js, which are already loaded unconditionally as module scripts by index.html.

Why

The browser otherwise discovers these two always-required modules only when parsing reaches the module-script tags near the end of <body>. Declaring them in <head> allows their fetches to begin earlier without changing execution order or application behavior.

Scope fence

  • No JavaScript behavior or date-formatting implementation is changed.
  • The reintroduced padStart() micro-optimization and its unsupported generalized performance claim were forward-reverted at exact head ba0e9b7669a00554b6a201d857a02646c83a7955.
  • No numeric performance improvement is claimed without a browser benchmark.
  • No dependency, workflow, auth, persistence, or security boundary changes are included.

Exact-head verification

Current contributor head: ba0e9b7669a00554b6a201d857a02646c83a7955

Fresh repository Server Tests, Fuzz, Dependency Review, OSV Scanner, Security Scan, and Semgrep runs were triggered for this head and are not counted as passing until they complete on the exact contributor revision with valid checkout/provenance evidence. Predecessor-head results are historical only. Independent review and all live branch-protection/ruleset requirements remain required before merge.

The current PR diff is limited to the two modulepreload declarations in index.html.

Superseded / queue convergence

Closed as superseded by current PR #468 after fresh exact-diff comparison. At closure, #586 contains only the two modulepreload declarations above, while #468 contains those exact declarations byte-for-byte plus its registered full-browser acceptance path that now relies on them. #586 therefore has no unique source, test, or documentation delta to preserve. This closure is queue convergence only: the preload behavior is not claimed as protected-develop shipped truth until #468 or an equivalent reconciled successor actually integrates under live governance.

- app.js 내 `formatDateInput`, `formatLocalDateInput`, `formatCompactDate` 함수에서 `String.padStart()`를 인라인 삼항 연산자로 대체
- index.html 모듈 프리로드 누락 수정
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@coderabbitai

coderabbitai Bot commented Aug 22, 2026

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Review 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: Pro Plus

Run ID: 8d06c17f-1620-4d89-8fe0-60e53612177a

📥 Commits

Reviewing files that changed from the base of the PR and between 2c32887 and b9b7ea0.

📒 Files selected for processing (3)
  • .jules/bolt.md
  • app.js
  • index.html

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.


📝 Walkthrough

Walkthrough

세 날짜 포맷 함수가 padStart 대신 인라인 조건식으로 월과 일을 패딩합니다. cloud-sync.jsanalytics.js의 모듈 프리로드 링크가 head에 추가되었습니다. 관련 학습 노트가 갱신되었습니다.

Changes

날짜 포맷 최적화

Layer / File(s) Summary
날짜 패딩 구현 변경
.jules/bolt.md, app.js
세 날짜 포맷 함수가 padStart 대신 인라인 조건식과 문자열 연결을 사용합니다. 기존 날짜 출력 형식과 함수 시그니처는 유지됩니다. 변경 근거가 학습 노트에 기록되었습니다.

모듈 프리로드

Layer / File(s) Summary
모듈 프리로드 링크 추가
index.html
cloud-sync.jsanalytics.js의 모듈 프리로드 링크가 <head>에 추가되었습니다.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to b9b7e

This localized performance and preload update has no actionable merge-blocking risk remaining beyond normal checks and review.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 20.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 1 files. (2 skipped: 2 unsupported.) Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
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 Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed 제목은 cloud-sync.js와 analytics.js의 modulepreload 추가를 정확히 설명하지만, 날짜 포맷 성능 개선 변경은 포함하지 않습니다.
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  • Create PR with unit tests
  • Commit unit tests in branch bolt/optimize-date-formatting-4472865672635472095

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

Open in Devin Review

Restore the baseline date formatting and remove the unsupported padStart performance generalization. Retain only the modulepreload change, whose effect follows directly from moving discovery of always-loaded modules into the document head.
@seonghobae seonghobae changed the title ⚡ Bolt: [performance improvement] 날짜 포맷 함수 최적화 (padStart 제거) perf: preload always-loaded cloud sync and analytics modules Aug 22, 2026

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@coderabbitai review

Please review the current exact head 612954b0a4ae10662ca75e3f3b59947118e74763, not predecessor b9b7ea034aad4c61cfeecdeb70f1d4bf6aa67ec0. The current semantic diff against live develop@2c328875e00e86537df3e965170be80532571cad is limited to the two modulepreload declarations in index.html; the earlier date-formatting and .jules/bolt.md changes were removed. Verify the exact current diff and surface only current-head findings.

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coderabbitai Bot commented Aug 23, 2026

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🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
set -euo pipefail

head_commit="612954b0a4ae10662ca75e3f3b59947118e74763"
base_commit="2c328875e00e86537df3e965170be80532571cad"

echo "== Checked-out HEAD =="
git rev-parse HEAD

echo
echo "== Verify requested commits exist =="
git cat-file -t "$head_commit"
git cat-file -t "$base_commit"

echo
echo "== Commit relationship =="
git merge-base --is-ancestor "$base_commit" "$head_commit" && echo "base is an ancestor of head"
git merge-base "$base_commit" "$head_commit"

echo
echo "== Exact semantic diff summary =="
git diff --stat "$base_commit" "$head_commit"
git diff --name-status "$base_commit" "$head_commit"

echo
echo "== Exact diff =="
git diff --no-ext-diff --unified=80 "$base_commit" "$head_commit" -- index.html

echo
echo "== index.html: relevant modulepreload and module script references at requested head =="
git show "${head_commit}:index.html" | nl -ba | grep -nE -C 4 '<link[^>]+rel="modulepreload"|<script[^>]+type="module"|cloud-sync\.js|analytics\.js'

echo
echo "== Module import sites in index.html and JavaScript sources =="
rg -n -C 3 --glob 'index.html' --glob '*.js' \
  '(?:import\s*(?:\(|[^;]*from\s*)|src=|href=).*?(?:cloud-sync|analytics)\.js|(?:cloud-sync|analytics)\.js' \
  .

Length of output: 6798


🏁 Script executed:

#!/bin/bash
set -euo pipefail

head_commit="612954b0a4ae10662ca75e3f3b59947118e74763"

echo "== index.html: head and module script declarations =="
git show "${head_commit}:index.html" | awk '
  /<head>/,/<\/head>/ {
    if ($0 ~ /modulepreload|type="module"|cloud-sync\.js|analytics\.js|app\.js/) {
      printf "%d: %s\n", NR, $0
    }
  }
'
echo
git show "${head_commit}:index.html" | awk '
  /<script[^>]+type="module"/ || /src="[^"]+\.js"/ {
    printf "%d: %s\n", NR, $0
  }
'

echo
echo "== app.js: imports and references to preloaded modules =="
git show "${head_commit}:app.js" | grep -nE -C 4 \
  '(^|[[:space:]])import[[:space:]].*(cloud-sync|analytics)|cloud-sync\.js|analytics\.js|import\(' || true

echo
echo "== cloud-sync.js: import declarations =="
git show "${head_commit}:cloud-sync.js" | grep -nE -C 2 \
  '^[[:space:]]*import[[:space:]]|import\(' || true

echo
echo "== analytics.js: import declarations =="
git show "${head_commit}:analytics.js" | grep -nE -C 2 \
  '^[[:space:]]*import[[:space:]]|import\(' || true

echo
echo "== Paths at repository root for referenced modules =="
git ls-tree -r --name-only "$head_commit" | grep -E '(^|/)(app|cloud-sync|analytics)\.js$' || true

Length of output: 1968


@seonghobae Reviewed the exact head 612954b0a4ae10662ca75e3f3b59947118e74763 against develop commit 2c328875e00e86537df3e965170be80532571cad.

The diff contains only the two modulepreload declarations in index.html. Both URLs exactly match same-origin root module scripts. I found no current-head findings.

⚠️ Action not completed

No files to review.

Note: CodeRabbit is an incremental review system and does not re-review already reviewed commits. This command is applicable only when automatic reviews are paused.

- app.js 내 `formatDateInput`, `formatLocalDateInput`, `formatCompactDate` 함수에서 `String.padStart()`를 인라인 삼항 연산자로 대체
- index.html 모듈 프리로드 누락 수정
devin-ai-integration[bot]

This comment was marked as resolved.

Forward-revert the reintroduced date-formatting micro-optimization and unsupported Bolt performance claim. Preserve only the two always-loaded modulepreload hints already isolated and previously verified against protected develop.
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