--- title: Which ones quietly made code harder to maintain later? description: Extracting shared logic into a base type reduced code duplication but hid important differences between similar-looking call sites. Over time, edge cases and... canonical: https://daily.dev/posts/which-ones-quietly-made-code-harder-to-maintain-later--j3aybybab twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Which ones quietly made code harder to maintain later? | daily.dev og:description: Extracting shared logic into a base type reduced code duplication but hid important differences between similar-looking call sites. Over time, edge cases and... og:url: https://daily.dev/posts/which-ones-quietly-made-code-harder-to-maintain-later--j3aybybab og:image: https://api.daily.dev/og/posts/J3aYbYBAB.png og:image:alt: Which ones quietly made code harder to maintain later? og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Which ones quietly made code harder to maintain later? **[Rebeloper](https://daily.dev/sources/rebeloper)** · 1 min read · 0 upvotes · 0 comments ## Summary Extracting shared logic into a base type reduced code duplication but hid important differences between similar-looking call sites. Over time, edge cases and flags accumulated, causing behavior to drift unpredictably. The solution was splitting the paths back into separate implementations with more files but clearer intent, prioritizing clarity over reuse. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [When to repeat yourself](https://daily.dev/posts/when-to-repeat-yourself-c67y3splj) · The Polymathic Engineer · 175 upvotes · 7 comments - [The Vertical Codebase](https://daily.dev/posts/the-vertical-codebase-kioev85i9) · TkDodo · 73 upvotes · 5 comments --- Tags: [#architecture](https://daily.dev/tags/architecture), [#technical-debt](https://daily.dev/tags/technical-debt) [View this post on daily.dev](https://daily.dev/posts/which-ones-quietly-made-code-harder-to-maintain-later--j3aybybab) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Which ones quietly made code harder to maintain later?","url":"https://daily.dev/posts/which-ones-quietly-made-code-harder-to-maintain-later--j3aybybab","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/which-ones-quietly-made-code-harder-to-maintain-later--j3aybybab"},"datePublished":"2026-02-05T13:42:56.469Z","dateModified":"2026-02-05T13:43:11.799Z","description":"Extracting shared logic into a base type reduced code duplication but hid important differences between similar-looking call sites. 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