The @itwin/core-frontend package contains the frontend (specific to running in a web browser) classes for querying, visualizing, and interacting with iModels.

Documentation

See the iTwin.js documentation for more information.

Source code layout

The source code is laid out according to the following top-level directory structure:

src/common/ contains code that is safe to use in a Worker and on the main thread. Code within this directory must not import files outside of src/common/, and must also avoid taking dependencies on APIs that are only usable on the main thread (e.g., the DOM APIs) or only usable on Workers (e.g., importScripts).
src/workers/ contains code that can only be used in Workers, along with specific Worker scripts delivered with the @itwin/core-frontend package. Code within this directory may import files from src/common/.
All other files in src/ - excluding the two subdirectories listed above - contain code that can only be used on the main thread. They can import from src/common/, but not from src/workers/.

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Package last updated on 17 Sep 2025

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