--- title: Keep runtime guards in sync with existing TypeScript types. description: A TypeScript utility library called is-kit provides runtime type guards designed to stay in sync with existing TypeScript types, enabling natural type... canonical: https://daily.dev/posts/keep-runtime-guards-in-sync-with-existing-typescript-types--71ullmwbd twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Keep runtime guards in sync with existing TypeScript types. | daily.dev og:description: A TypeScript utility library called is-kit provides runtime type guards designed to stay in sync with existing TypeScript types, enabling natural type... og:url: https://daily.dev/posts/keep-runtime-guards-in-sync-with-existing-typescript-types--71ullmwbd og:image: https://api.daily.dev/og/posts/71ULLMWbD.png og:image:alt: Keep runtime guards in sync with existing TypeScript types. 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. # Keep runtime guards in sync with existing TypeScript types. **[nyaomaru](https://daily.dev/sources/graxwfjk0eop4zs3tdzdr)** · [@nyaomaru](https://daily.dev/nyaomaru) · 1 min read · 0 upvotes · 0 comments ## Summary A TypeScript utility library called is-kit provides runtime type guards designed to stay in sync with existing TypeScript types, enabling natural type narrowing without needing 'as' type assertions. ## Content  No `as`. Just natural narrowing. https://github.com/nyaomaru/is-kit #typescript #productivity #cleancode #openspurce ## Similar posts on daily.dev - [Stop Type Drift with Linked Typing](https://daily.dev/posts/stop-type-drift-with-linked-typing-lzs6ewbob) · TypeScript.TV · 1 upvotes · 0 comments --- Tags: [#typescript](https://daily.dev/tags/typescript) [View this post on daily.dev](https://daily.dev/posts/keep-runtime-guards-in-sync-with-existing-typescript-types--71ullmwbd) ```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/keep-runtime-guards-in-sync-with-existing-typescript-types--71ullmwbd","headline":"Keep runtime guards in sync with existing TypeScript types.","text":"A TypeScript utility library called is-kit provides runtime type guards designed to stay in sync with existing TypeScript types, enabling natural type narrowing without needing 'as' type assertions.","url":"https://daily.dev/posts/keep-runtime-guards-in-sync-with-existing-typescript-types--71ullmwbd","datePublished":"2026-08-17T15:16:15.910Z","dateModified":"2026-08-17T15:16:28.188Z","author":{"@type":"Person","name":"nyaomaru","url":"https://daily.dev/nyaomaru","image":"https://avatars.githubusercontent.com/u/90489696?v=4","interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"EndorseAction"},"userInteractionCount":280}},"interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"isPartOf":{"@type":"WebPage","url":"https://daily.dev/sources/graxwfjk0eop4zs3tdzdr","name":"nyaomaru"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"nyaomaru","item":"https://daily.dev/sources/graxwfjk0eop4zs3tdzdr"},{"@type":"ListItem","position":3,"name":"Keep runtime guards in sync with existing TypeScript types."}]} ```