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LWC Browser/VS Code Preview

Single-component preview without deploying. Faster iteration, better inner loop. Probably the highest-impact dev feature this release for UI developers. Enable it in .vscode/settings.json:

{
  "salesforce.lwc.preview.enabled": true,
  "salesforce.lwc.preview.mockData": "./mock-data"
}

Run sf lightning preview component --name myComponent to render in browser. Mock @wire data via JSON files so you don’t need an org connection for visual tweaks. Limits: integration components needing real Account or User records still require a scratch org. The typical iteration loop drops from 60 seconds (push to scratch + refresh) to 2 seconds (save + hot-reload).

API Surface Improvements

Expanded REST endpoints, better error responses, richer Bulk API 2.0 capabilities. Integration developers get cleaner contracts. Worth re-checking your API usage for new patterns that simplify existing code. Specific Summer ‘26 additions: a /services/data/v62.0/composite/batch enhancement allowing 50 sub-requests per call (up from 25), structured error responses with errorCode, message, fields, and correlationId for traceability, and Bulk API 2.0 query jobs now supporting lineEnding=LF plus columnDelimiter overrides natively. The /limits endpoint now reports Agentforce credit consumption alongside the usual API call count.

Apex Productivity

Language improvements, testing ergonomics, debugging enhancements. Incremental per release; cumulatively meaningful. Check the developer release notes for anything that affects your style guide. Summer ‘26 ships:

// Null-coalescing operator (GA)
String label = account.Description ?? 'No description';

// Safe navigation operator
Integer count = opp?.OpportunityLineItems?.size() ?? 0;

// New Map.deepClone() preserves nested SObject references
Map<Id, Account> snapshot = (Map<Id, Account>) accountMap.deepClone();

The Apex Replay Debugger now supports conditional breakpoints with expression evaluation, and the Apex Test Suite runner emits structured JSON via sf apex run test --result-format json --code-coverage for direct ingest into your CI dashboard.

Deployment Tooling

SFDX and sf CLI continue maturing. Git-first workflows get smoother. Preview changes before deployment; deploy specific metadata with finer control. DevOps teams see continued velocity improvements. The Summer ‘26 sf project deploy preview command now diffs the source against the target org and prints a precise plan before any deploy hits production:

sf project deploy preview --target-org production --source-dir force-app

Ignore patterns finally honor .forceignore consistently across deploy, retrieve, and source push. The Salesforce DX MCP Server (Developer Preview) lets you trigger most of these commands via natural language from Claude Desktop or Cursor.

What Changed in 2026

The cumulative direction is unmistakable: faster inner loops, richer telemetry, MCP-native developer ergonomics. Spring ‘26 added Apex AI Assist for inline code completion. Summer ‘26 closes the loop with the LWC preview that makes iteration feel like modern JS frameworks. Winter ‘26 (per the roadmap) is expected to bring native Jest debugger integration and TypeScript-first LWC authoring out of pilot.

Common Failure Modes

LWC preview without proper mock data renders blank — components silently fail when @wire returns undefined. Always ship a __mocks__ directory alongside any component that depends on Salesforce data. The new Apex null-coalescing operators don’t backport: code using ?? won’t compile in orgs still on Spring ‘26 API version. Lock your apiVersion in sfdx-project.json to match the lowest target org or you’ll ship code that breaks in older sandboxes.

What to do this week

Pin apiVersion to 62.0 in your project file, enable LWC preview in VS Code settings, and write one mock data file for your most-edited component. Measure your iteration time before and after — most teams see a 10× speed-up on UI work.

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