chore: reproduce #1718 bundle diff with AI analysis

[yifancong]

Purpose

Temporarily recreate the Rsdoctor Bundle Diff produced for #1718 so the newly configured AI_TOKEN can analyze the same change direction.

The original report fell back to commit 77b5d0f5 for its baseline. This PR therefore compares that baseline state with the repository state after #1718 (c7fff14e), while keeping the AI-enabled Bundle Diff workflow identical on both branches.

Setup

• Base branch: agent/repro-1718-base
• Head branch: agent/repro-1718-head
• Rsdoctor Action: v1.1.4 commit 2fbd50933702502f12d2bbef5273afbfd829a289
• AI credential: repository secret AI_TOKEN

Impact

Temporary analysis only. This PR must not be merged.

Validation

• Workflow diff between base and head is empty.
• PR diff reconstructs the original fallback-baseline comparison.
• git diff --check passed for the workflow changes.

After the AI report is available, close this PR and delete both temporary branches.

[github-actions]

Rsdoctor Bundle Diff Analysis

Found 13 projects in monorepo, 2 projects with changes.

📊 Quick Summary

Project	Total Size	Gzip Size	Change	Gzip Change
adapter-rsbuild	6.1 KB	2.0 KB	0	0
adapter-rslib	50.4 KB	13.3 KB	0	0
adapter-rspack	12.4 KB	2.9 KB	0	0
browser	1.1 MB	306.3 KB	0	0
coverage-istanbul	20.0 KB	4.5 KB	0	0
browser-react	6.4 KB	1.3 KB	0	0
coverage-v8	81.4 KB	15.2 KB	0	0
playwright	49.4 KB	10.2 KB	0	0
browser/client	73.0 KB	10.3 KB	0	0
core/browser	608.3 KB	175.3 KB	0	0
core/main	1.8 MB	488.6 KB	-177.0 B (-0.0%)	-41.0 B (-0.0%)
vscode/extension	1.2 MB	82.1 KB	+108.0 B (0.0%)	+126.0 B (0.2%)
vscode/worker	14.7 KB	3.8 KB	0	0

📋 Detailed Reports (Click to expand)

📁 core/main

Path: packages/core/.rsdoctor/main/rsdoctor-data.json

📌 Baseline Commit: 7f5ba5dec8a51b265bef4c416d4c5ebbe0978b1a | PR: #1721

Metric	Current	Baseline	Change
📊 Total Size	1.8 MB	1.8 MB	-177.0 B (-0.0%)
🗜️ Gzip Size	488.6 KB	488.6 KB	-41.0 B (-0.0%)
📄 JavaScript	1.4 MB	1.4 MB	-177.0 B (-0.0%)
🎨 CSS	0 B	0 B	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	414.4 KB	414.4 KB	0

📦 Download Diff Report: core/main Bundle Diff

📁 vscode/extension

Path: packages/vscode/.rsdoctor/extension/rsdoctor-data.json

📌 Baseline Commit: 7f5ba5dec8a51b265bef4c416d4c5ebbe0978b1a | PR: #1721

Metric	Current	Baseline	Change
📊 Total Size	1.2 MB	1.2 MB	+108.0 B (0.0%)
🗜️ Gzip Size	82.1 KB	82.0 KB	+126.0 B (0.2%)
📄 JavaScript	528.5 KB	528.4 KB	+108.0 B (0.0%)
🎨 CSS	0 B	0 B	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	723.8 KB	723.8 KB	0

📦 Download Diff Report: vscode/extension Bundle Diff

🤖 AI Degradation Analysis (Click to expand)

📁 core/main

📊 Size Changes

No significant regressions detected 🎉

All metrics show a net decrease:

• Total bundle: −177 B (0.009% ↓)
• JS total: −177 B (0.012% ↓)
• Initial JS: −177 B (0.030% ↓)
• No assets added, removed, or meaningfully changed beyond noise threshold (>5% or >10 KB).
• fdir module shrank slightly (−172 source bytes, −90 gzip bytes); no new large modules or duplicates.

🔍 Root Cause Analysis

• Minor size reduction driven by updated fdir@6.5.0 (replacing same version but with internal optimizations — likely build tooling or transpilation variance; no functional change per diff).
• @rstest/core version bump (0.11.6 → 0.11.8) shows zero size impact (all sizes = 0), confirming it’s not bundled or is tree-shaken fully.

⚠️ Risk Assessment

Low
Zero increase in initial chunk or total bundle size; all deltas are sub-200 bytes and well below detection thresholds — no runtime or load-time impact.

💡 Optimization Suggestions

1. ✅ No action needed — this PR delivers a tiny, risk-free size improvement.
2. Consider adding a CI check (e.g., Rsdoctor --threshold 50) to catch future >50 B regressions in initial chunks early.
3. Verify @rstest/core remains unbundled (as indicated by 0-byte size) — confirm its usage is strictly dev-only or properly externalized.

_{Analysis by qwen-plus}

📁 vscode/extension

📊 Size Changes

No significant regressions detected 🎉
(All changes are <5% and <10 KB; largest delta is +108 B total bundle, +108 B JS, +108 B initial chunk — well below thresholds.)

🔍 Root Cause Analysis

• fdir@6.5.0 module shrank slightly (parsedSize ↓162 B, gzipSize ↓81 B) — a net win.
• rstest package was upgraded from 0.11.6 → 0.11.8, but source/parsed/gzip sizes are identical (no size impact).
• No added/removed modules or duplicate dependencies; no new large assets.

⚠️ Risk Assessment

Low
Initial chunk grew by only +108 B (+0.028%), and total bundle increased by just +108 B (0.008%). Zero impact on load performance or caching.

💡 Optimization Suggestions

1. ✅ No action needed — this diff reflects a neutral, safe dependency update with minor internal optimizations (e.g., fdir parsing reduction).
2. Consider adding a CI size budget check (e.g., ±5 KB) to catch future regressions early — though current delta is negligible.
3. Optional: Audit rstest’s build output if it ever starts contributing to JS chunks (currently appears unused in bundle per module list).

_{Analysis by qwen-plus}

Generated by Rsdoctor GitHub Action