bug: Re-minifying the language service worker breaks JSON Schema diagnostics #489

Describe the Bug

JSON Schema diagnostics fail in the production build of the vanilla Web Component PoC when the consuming application minifies the already-minified Text Editor language service worker.

The JSON language service throws:

Language service plugin "json" failed to provide document feature:
TypeError: Cannot read properties of undefined (reading 'include')

The exception is caught and diagnostics return an empty array, leaving invalid workflows without schema warnings. JSON syntax errors can still produce squiggles, making the failure less obvious.

Steps to reproduce

1. Build examples/vanilla-web-component for production, minifying the worker again, using this DO NOT MERGE - fix #380 - poc: Validate Text Editor and Language Service in vanilla Web Component #488

pnpm --filter @openworkflowspec/vanilla-web-component-example build:prod

2. Serve the production build and open this workflow:

cd examples/vanilla-web-component
npx http-server dist

{
  "document": {
    "dsl": "1.0.3",
    "namespace": "examples",
    "name": "hello-world",
    "version": "0.1.0"
  },
  "do": [{
    "greet": {
      "call": "http",
      "wrong": {
        "method": "GET",
        "endpoint": "https://httpbin.org/get"
      }
    }
  }]
}

3. Observe that schema diagnostics are missing and the worker reports the exception above.

Expected Behavior

Production builds provide JSON Schema diagnostics consistently with development builds, including warnings for the invalid wrong property and missing required properties.

Editor Version

Local Text Editor build used for PoC #488.

Platform

Web / Browser

Additional Context

Discovered while validating #380 and reproduced in the GitHub Pages deployment. Local development server was not affected.

Setting build.minify: false in packages/text-editor/vite.config.ts, leaving minification to the consuming application, restored schema diagnostics in production.

This is the current PoC workaround. The underlying minifier transformation still needs investigation.