Salesforce Development in Summer '26: Agentforce Vibes, Live Preview, and LWC Updates
A developer's guide to Salesforce Summer '26 — Live Preview (formerly Local Dev) GA, Lightning Types, new and changed Lightning Web Components, API v67.0, a 10 GB file upload limit, and SQL from Apex.
The Development section of Summer '26 is dense, but a few changes genuinely affect how you build. Here's a developer-focused walkthrough of what's new for Lightning components, Apex, and the platform APIs.
Live Preview (formerly Local Dev) goes GA
If you've been using Local Dev, note the rename: Local Dev is now Live Preview. And it's graduated:
- Single Component Live Preview and the Live Preview Visual Studio Code extension for Lightning web components are Generally Available.
- Use state managers to centralize and decouple data logic from component presentation.
- Review new and updated distortions in the Lightning Web Security Distortion Viewer.
- Preview and test features with Salesforce Release Manager (Beta).
- Update your Lightning Web Components API version to 67.0.
The faster feedback loop from Live Preview is a real quality-of-life win for front-end work.
Lightning Types: structured data for custom components and Agentforce
Lightning Types let you define the data structures that drive custom components — and, notably, structure Agentforce responses. You can use these types to customize the UI in Agentforce and other supported surfaces, which is increasingly important as agents render richer, more structured output.
Notable Lightning Web Component changes
API version 67.0 brings new and changed components. Highlights worth knowing:
- lightning-file-upload — the maximum file size jumps from 2 GB to 10 GB. If you've built workarounds for large uploads, you may be able to retire them.
- New: lightning-dynamic-list-container and lightning-dynamic-list-item (Developer Preview) — load and manage large lists based on scroll position, for performant virtualized lists.
- lightning-combobox — a new button variant renders a pill-shaped combobox with SLDS icon support.
- lightning-input (checkbox) — a new indeterminate attribute for proper "select all" tri-state behavior.
- Broad accessibility improvements across lightning-datatable, lightning-dual-listbox, and others — better keyboard navigation, screen reader support, and high-magnification reflow.
- Right-to-left language fixes across many components (carousel, click-to-dial, formatted-location, tabset, and more).
These accessibility and RTL fixes are easy to overlook but matter for compliance and global apps.
Apex and APIs
- Execute SQL queries from Apex against Data 360 — bring large-scale data querying into your Apex logic.
- API version 67.0 gives you access to more data objects and metadata types.
- ConnectApi (Connect in Apex) adds new and changed classes and enums for building custom experiences.
- Change Data Capture adds support for more objects (for example, AccountTeamMember).
Agentforce Vibes: natural-language code extensions
The agentic theme reaches developers too. Agentforce Vibes lets you create and deploy code extensions using natural language — for example, building Data 360 code extensions by describing what you want. It won't replace hand-written code for complex logic, but it's a fast on-ramp for routine extensions.
Frequently asked questions
What happened to Local Dev? It was renamed Live Preview. Single Component Live Preview and the Live Preview VS Code extension are now Generally Available.
What's the new file upload size limit? lightning-file-upload now supports up to 10 GB, increased from 2 GB.
Can I run SQL from Apex now? Yes — Summer '26 lets you execute SQL queries from Apex against Data 360.
What API version should I target? API version 67.0 for Summer '26, which adds new objects and metadata types. Update your LWC API version to 67.0 to use the latest components.
What are Lightning Types used for? Defining the data structures that drive custom components and structuring Agentforce responses, so you can customize UIs in Agentforce and other supported contexts.
The bottom line
Summer '26 gives developers a faster inner loop (Live Preview GA), bigger ceilings (10 GB uploads, virtualized lists), better accessibility, and new ways to feed structured data into agents (Lightning Types, SQL from Apex, Agentforce Vibes). Bump your components to API 67.0 and take the new tooling for a spin.
Building on top of Salesforce's data layer? See our Data 360 guide.