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Your app must serve these runtime files: 
grunt.js
_framework/*
If you use the npm package, these assets are in: 
node_modules/@grunt/ckeditor5-grunt/_framework

​
Requirements

  • Copy runtime files into your build output
  • Serve files over HTTP
  • Avoid processing or rewriting runtime assets in bundling steps
  • Serve correct MIME types for JS, WASM, and static files
If these files are missing or misconfigured, Grunt rendering and editing will fail at runtime.

Next: toolbar and production checklist

Validate your toolbar config and production readiness.