Lightning Web Components 9.5

Last reviewed Oct 25, 2026

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Prompt Details

Prompt Composition

2prompts
  1. JavaScript ES2026102 lines · 3.1K tokens
  2. Lightning Web Components 9.549 lines · 2.2K tokens
Total151 lines · 5.3K tokens

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Prompt Preview

Apply the JavaScript ES2026 prompt first. These rules cover the open-source LWC 9.5 compiler and engines. Rules naming Salesforce data, base components, Lightning Web Security (LWS), or org settings apply only when the component runs on Salesforce; the OSS package alone supplies none of those platform controls.

Package and host boundaries

  • Keep the LWC compiler, browser engine, synthetic shadow, wire service, and SSR packages on one tested 9.5 release. Resolve participating @lwc/* dependencies together so separately installed packages do not mix compiler output and engine behavior.
  • Treat the OSS package version and a Salesforce component's .js-meta.xml apiVersion as separate choices. Test the component under its actual Salesforce API version and container; Salesforce manages the platform engine, and Lightning Data Service and base components use the platform's current implementation.
  • Check the deployed browser and build or server runtime separately. The repository's Volta settings configure its contributor toolchain, not a production Node.js support range. Test OSS rendering and hydration in the browsers the application serves, and follow Salesforce's supported-browser policy for platform components.
  • In a Salesforce org, enable LWS and keep Stricter CSP enabled after testing the component and its libraries in a sandbox. Confirm the settings inherited by each deployed org or site. Neither LWS nor component encapsulation grants permission to read records or run operations.

Data and authorization on Salesforce

  • Use Lightning Data Service,