--- title: Day 2/60 — Why TypeScript strict mode should always be... description: Using TypeScript with `strict: false` provides no real type safety — it's essentially JavaScript with extra compilation overhead. Enabling `"strict": true`... canonical: https://daily.dev/posts/day-2-60-why-typescript-strict-mode-should-always-be-enabled-pjbirz0ao twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Day 2/60 — Why TypeScript strict mode should always be enabled | daily.dev og:description: Using TypeScript with `strict: false` provides no real type safety — it's essentially JavaScript with extra compilation overhead. Enabling `"strict": true`... og:url: https://daily.dev/posts/day-2-60-why-typescript-strict-mode-should-always-be-enabled-pjbirz0ao og:image: https://api.daily.dev/og/posts/pJBIRZ0ao.png og:image:alt: Day 2/60 — Why TypeScript strict mode should always be enabled 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. # Day 2/60 — Why TypeScript strict mode should always be enabled **[Taiwo Francis Oguntade](https://daily.dev/sources/fstpm3zejud3qgleeoous)** · [@taiwofrancis](https://daily.dev/taiwofrancis) · 1 min read · 1 upvotes · 0 comments ## Summary Using TypeScript with `strict: false` provides no real type safety — it's essentially JavaScript with extra compilation overhead. Enabling `"strict": true` from the start forces the compiler to catch structural issues early, preventing runtime bugs. If enabling strict mode breaks a project, that signals underlying code quality problems, not a configuration issue. ## Content Setting up TypeScript with `strict: false` isn't a "compromise" it is just JavaScript with extra steps and zero safety. If your configuration allows implicit `any` or loose null checks, you are paying the compile-time tax without getting any of the production insurance. You are lying to yourself and your codebase. True type safety begins when you let the compiler do its job completely unhindered. If turning on strict mode breaks your entire project, that is not a TypeScript configuration problem; it is a structural code problem. **Welcome to Day 2 of 60 Days of TypeScript.**  - **The Rule:** Set `"strict": true` on day one. No exceptions. - **The Goal:** Catch structural flaws at the root before they become runtime emergencies. **Let's debate:** Is there ever a valid reason to turn off strict mode in a production codebase? ## Similar posts on daily.dev - [JavaScript’s Most Forgiving Syntaxes](https://daily.dev/posts/javascript-s-most-forgiving-syntaxes-dar9euvvn) · Medium · 0 upvotes · 0 comments - [20 Mistakes That Quietly Destroy JavaScript/TypeScript Codebases \(Part 1\)](https://daily.dev/posts/20-mistakes-that-quietly-destroy-javascript-typescript-codebases-part-1--n6okeimrf) · The T-Shaped Dev · 6 upvotes · 0 comments - [TypeScript 6.0 is your final warning](https://daily.dev/posts/typescript-6-0-is-your-final-warning-2tbdrcemi) · Bytes by ui.dev · 144 upvotes · 15 comments - [TypeScript levels up with type stripping](https://daily.dev/posts/typescript-levels-up-with-type-stripping-gb9bktba8) · InfoWorld · 1 upvotes · 0 comments --- Tags: [#typescript](https://daily.dev/tags/typescript) [View this post on daily.dev](https://daily.dev/posts/day-2-60-why-typescript-strict-mode-should-always-be-enabled-pjbirz0ao) ```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":"DiscussionForumPosting","mainEntityOfPage":"https://daily.dev/posts/day-2-60-why-typescript-strict-mode-should-always-be-enabled-pjbirz0ao","headline":"Day 2/60 — Why TypeScript strict mode should always be enabled","text":"Using TypeScript with `strict: false` provides no real type safety — it's essentially JavaScript with extra compilation overhead. 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