The types-utils package provides foundational types and helpers used across client and server modules.

This area includes:

1. Geometry and range primitives (point, rectangle, corner-area, start-length).
2. Selection and keyboard-related enums/types.
3. Canvas and CSS utility abstractions.
4. Generic helpers (registry, error wrappers, and runtime utility functions).

These primitives are intentionally small and reusable so higher-level modules can compose behavior without duplicating low-level logic.

Major Symbol Families

1. Geometry and ranges: RevPoint, RevRectangle, RevCornerArea, RevCornerRectangle, RevStartLength.
2. Selection typing: RevSelectionAreaTypeId, RevSelectionAreaType, RevSelectionAreaType namespace conversion helpers.
3. View/state helpers: RevEnsureFullyInView, RevModifierKey, registry and utility helpers.
4. Error and runtime utility types: RevgridError derivatives and shared structural aliases.

Each utility module under common/types-utils has a generated API Reference page listing interfaces, enums, namespaces, constants, and all member signatures.