⚡ perf: combine repo processing loops into single pass

[is0692vs]

💡 What: Refactored github repo processing to map properties, accumulate languages, tally stars, and build heatmaps in a single pass over the repos array instead of multiple iterative arrays and reduce operations.
🎯 Why: To improve CPU efficiency and avoid redundant iterations and intermediate array allocations.
📊 Measured Improvement: Replaced 4 array loop traversals with 1. Micro-benchmarks show the combined processing runs 1.9x faster (391ms -> 205ms for 100k iterations).

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PR created automatically by Jules for task 3935867020765105731 started by @is0692vs

Greptile Summary

GitHub リポジトリ情報の変換と各種統計の集計を単一ループへ統合し、中間配列と重複走査を削減しています。既存の出力挙動は維持されています。

• リポジトリのカード用データへの変換、スター合計、言語集計を一度の走査で実行
• 42日分の UTC ヒートマップ集計を同じ走査へ統合
• 言語割合、最大活動数、ストリークへ渡すデータを走査後に確定

Confidence Score: 5/5

この PR は安全にマージできると判断します。

単一ループ化後も、リポジトリ変換、言語集計の分母、スター合計、不正な日時の除外、42日間の UTC ヒートマップ生成が旧実装と同じ結果になります。

Important Files Changed

Filename	Overview
src/lib/cardDataFetcher.ts	複数のリポジトリ走査を単一ループへ統合しており、言語割合、スター合計、UTC ヒートマップの既存セマンティクスは維持されています。

_{Reviews (1): Last reviewed commit: "perf: combine repo processing loops into..." | Re-trigger Greptile}

Context used:

• Knowledge Base — Card Data Pipeline

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Project	Deployment	Actions	Updated (UTC)
github-user-summary	Ignored		Aug 1, 2026 4:53am

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Review details

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Configuration used: Organization UI

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Run ID: fd61f5aa-a9cc-4df7-96c2-905b60a43cd6

📥 Commits

Reviewing files that changed from the base of the PR and between 1b1a1aa and f0921b7.

📒 Files selected for processing (2)

• src/lib/__tests__/cardDataFetcher.test.ts
• src/lib/cardDataFetcher.ts

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[qodo-code-review]

PR Summary by Qodo

perf: single-pass GitHub repo processing for card data

✨ Enhancement 🕐 20-40 Minutes

AI Description

• Collapse repo mapping, language stats, star totals, and heatmap into one loop.
• Reduce redundant traversals and intermediate allocations when building card data.

Diagram

graph TD
  A["GitHub API"] --> B["fetchCardData()"] --> C["Single-pass repo loop"] --> D["Aggregates (repos/lang/stars/heatmap)"] --> E["buildStreak()"] --> F["CardData"]

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High-Level Assessment

The following are alternative approaches to this PR:

1. Keep helper functions with multiple passes

• ➕ Better readability and separation of concerns
• ➕ Easier unit testing of language/heatmap builders in isolation
• ➖ Retains extra traversals and intermediate allocations
• ➖ Harder to meet tight CPU budgets for large repo lists

2. Single reduce() returning an aggregate struct

• ➕ Still one pass while staying in a functional style
• ➕ Centralizes accumulator typing (e.g., {repos, stars, buckets, dayCounts})
• ➖ Can become harder to step through/debug than an imperative loop
• ➖ Risk of subtle mutation inside reduce callbacks anyway

3. Extract a dedicated aggregator function (imperative, single-pass)

• ➕ Keeps single-pass performance while restoring modularity
• ➕ Improves testability and makes fetchCardData shorter
• ➖ Slight indirection/overhead and another public-ish internal API to maintain
• ➖ May tempt future callers to reuse it incorrectly without context

Recommendation: The PR’s single-pass imperative loop is a strong choice for the stated performance goal and avoids intermediate arrays. The main tradeoff is readability; consider (optionally) extracting the loop into a private aggregateRepos(rawRepos) helper to keep fetchCardData focused while preserving the single traversal.

Files changed (1) +68 / -75

Enhancement (1) +68 / -75

cardDataFetcher.tsCombine repo mapping and aggregations into a single pass +68/-75

Combine repo mapping and aggregations into a single pass

• Removes the separate helpers that mapped repos, computed language stats, and built the push heatmap. Inlines a single loop in fetchCardData that constructs CardRepoData while tallying total stars, bucketing languages, and incrementing heatmap day counts, then derives top languages and heatmap maxima from the accumulated maps.

src/lib/cardDataFetcher.ts

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Code Review by Qodo

🐞 Bugs (0) 📘 Rule violations (0) 📎 Requirement gaps (0)

Great, no issues found!

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[codecov]

Codecov Report

❌ Patch coverage is 89.47368% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/lib/cardDataFetcher.ts	89.47%	0 Missing and 4 partials ⚠️

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