--- title: Lock Down Values in Pulumi ESC with fn::final | daily.dev description: Pulumi ESC introduces fn::final, a built-in function that lets you mark configuration values as immutable in parent environments. When a child environment... canonical: https://daily.dev/posts/lock-down-values-in-pulumi-esc-with-fn-final-4mtaglogg twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Lock Down Values in Pulumi ESC with fn::final | daily.dev og:description: Pulumi ESC introduces fn::final, a built-in function that lets you mark configuration values as immutable in parent environments. When a child environment... og:url: https://daily.dev/posts/lock-down-values-in-pulumi-esc-with-fn-final-4mtaglogg og:image: https://api.daily.dev/og/posts/4mtaGLOgG.png og:image:alt: Lock Down Values in Pulumi ESC with fn::final 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. # Lock Down Values in Pulumi ESC with fn::final **[Pulumi](https://daily.dev/sources/pulumi)** · 3 min read · 0 upvotes · 0 comments ## Summary Pulumi ESC introduces fn::final, a built-in function that lets you mark configuration values as immutable in parent environments. When a child environment attempts to override a value marked with fn::final, ESC raises a warning and preserves the original value, preventing accidental or unauthorized changes to security policies and compliance settings. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Schema Validation Comes to Pulumi ESC with fn::validate](https://daily.dev/posts/schema-validation-comes-to-pulumi-esc-with-fn-validate-4gpqaecvy) · Pulumi · 0 upvotes · 0 comments - [Deletion Protection for Pulumi ESC Environments](https://daily.dev/posts/deletion-protection-for-pulumi-esc-environments-a21bglyng) · Pulumi · 0 upvotes · 0 comments - [Policy Packs Can Now Access Pulumi ESC Environments](https://daily.dev/posts/policy-packs-can-now-access-pulumi-esc-environments-p0xrcszmf) · Pulumi · 0 upvotes · 0 comments - [Preview ESC Changes with Environment Overrides](https://daily.dev/posts/preview-esc-changes-with-environment-overrides-7xak0juik) · Pulumi · 0 upvotes · 0 comments - [Pulumi ESC: Open Approvals](https://daily.dev/posts/pulumi-esc-open-approvals-7m8zjf6fb) · Pulumi · 0 upvotes · 0 comments --- Tags: [#iac](https://daily.dev/tags/iac), [#pulumi](https://daily.dev/tags/pulumi), [#secrets-management](https://daily.dev/tags/secrets-management) [View this post on daily.dev](https://daily.dev/posts/lock-down-values-in-pulumi-esc-with-fn-final-4mtaglogg) ```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":"Lock Down Values in Pulumi ESC with fn::final","url":"https://daily.dev/posts/lock-down-values-in-pulumi-esc-with-fn-final-4mtaglogg","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/lock-down-values-in-pulumi-esc-with-fn-final-4mtaglogg"},"datePublished":"2026-03-17T20:32:04.372Z","dateModified":"2026-08-24T06:56:27.386Z","description":"Pulumi ESC introduces fn::final, a built-in function that lets you mark configuration values as immutable in parent environments. 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