I Fed React's Entire Hooks Transition History to Gemma 4. Here's What It Found That We Missed.

May 23, 2026 · 10:20 AM UTC ·9 min read · 0 reactions · 0 comments · 10 views

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The article discusses the use of Gemma 4 to analyze the transition history of React's Hooks. It highlights the challenges developers face in tracing the origins of bugs in legacy codebases. By utilizing Gemma 4's Thinking Mode, the author was able to uncover causal relationships in the commit history that traditional tools could not reveal.

Key facts

▪The author built CodeDNA to analyze the quality degradation of a legacy codebase.
▪Gemma 4's Thinking Mode allows for reasoning about patterns in commit history, connecting changes to subsequent issues.
▪The React repository's Hooks transition was used as a test case due to its verifiability by other developers.

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Original publisher	DEV.to (Top)
Canonical URL	https://dev.to/sujal_gupta_3dc0d9052e350/i-fed-reacts-entire-hooks-transition-history-to-gemma-4-heres-what-it-found-that-we-missed-3faf
Publication time	Sat, 23 May 2026 10:20:38 +0000
Retrieval time	2026-05-23T10:37:26.419Z
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try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3909504) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Sujal Gupta Posted on May 23 I Fed React's Entire Hooks Transition History to Gemma 4. Here's What It Found That We Missed. #devchallenge #gemmachallenge #gemma #git Gemma 4 Challenge: Build With Gemma 4 Submission "Which commit broke everything?" Every developer who has inherited a legacy codebase has asked this. We just never had a good way to answer it. The Problem That Started This Six months ago I was debugging a production issue in a codebase I'd inherited.

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