--- title: How TypeScript 4.9 `satisfies` Your Prisma Workflows description: TypeScript 4.9 introduced the `satisfies` operator, which lets you validate that a value conforms to a type without widening it. This post explores several... canonical: https://daily.dev/posts/how-typescript-4-9-satisfies-your-prisma-workflows-cedwadejd twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: How TypeScript 4.9 `satisfies` Your Prisma Workflows | daily.dev og:description: TypeScript 4.9 introduced the `satisfies` operator, which lets you validate that a value conforms to a type without widening it. This post explores several... og:url: https://daily.dev/posts/how-typescript-4-9-satisfies-your-prisma-workflows-cedwadejd og:image: https://api.daily.dev/og/posts/CeDwadeJd.png og:image:alt: How TypeScript 4.9 `satisfies` Your Prisma Workflows 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. # How TypeScript 4.9 `satisfies` Your Prisma Workflows **[Prisma Blog](https://daily.dev/sources/prisma-blog)** · 7 min read · 0 upvotes · 0 comments ## Summary TypeScript 4.9 introduced the `satisfies` operator, which lets you validate that a value conforms to a type without widening it. This post explores several practical use cases with Prisma: inferring output types for methods like `findMany`, `count`, `aggregate`, and `groupBy` without using `Prisma.validator`; creating lossless schema validators with libraries like Zod; defining reusable query filter collections; and writing strongly typed Remix loader functions that preserve inferred return types. The operator provides compile-time safety with zero runtime overhead, replacing workarounds like constrained identity functions. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [TIL: \`satisfies\` is my favorite TypeScript keyword](https://daily.dev/posts/til-satisfies-is-my-favorite-typescript-keyword-mwwj6l0n8) · Hacker News · 4 upvotes · 0 comments - [Zod \+ TypeScript: Schema Validation Made Easy](https://daily.dev/posts/zod-typescript-schema-validation-made-easy-w9edwu63u) · Telerik · 1 upvotes · 1 comments - [Zod \+ TypeScript: Schema Validation Made Easy – Frontend Masters Blog](https://daily.dev/posts/zod-typescript-schema-validation-made-easy-frontend-masters-blog-yv5epna6v) · Frontend Masters · 0 upvotes · 0 comments --- Tags: [#typescript](https://daily.dev/tags/typescript), [#prisma](https://daily.dev/tags/prisma), [#zod](https://daily.dev/tags/zod) [View this post on daily.dev](https://daily.dev/posts/how-typescript-4-9-satisfies-your-prisma-workflows-cedwadejd) ```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":"How TypeScript 4.9 `satisfies` Your Prisma Workflows","url":"https://daily.dev/posts/how-typescript-4-9-satisfies-your-prisma-workflows-cedwadejd","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/how-typescript-4-9-satisfies-your-prisma-workflows-cedwadejd"},"datePublished":"2026-05-31T07:44:47.750Z","dateModified":"2026-05-31T08:56:47.034Z","description":"TypeScript 4.9 introduced the `satisfies` operator, which lets you validate that a value conforms to a type without widening it. 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