Today I Learned

Daily reflections on work and learning—what I did and what I learned.

2 entries · #selection

2026년 7월

2026-07-06

Bundle Shared Vendor, Cross-Block Selection, Floating-UI Coordinates

webpack splitChunks traps, cross-block range operations in a hybrid editor, selectionchange·scroll anchor patterns, Context subscription separation

Using chunks:all with a fixed name on a catch-all vendor pulls dynamic imports up into a shared chunk.
For cross-block text operations, stateless derivation from getSelection + a single boundary split is safer than range state.

2026-07-04

The Document Is the Host SoT; the Editor Is a Focused Guest

Explaining, for a first-time reader, the host/guest boundary in a block-document editor, React external-store snapshots, the 2-stack undo, and HTML5 drag and selection/copy

Document meaning is owned by host patches, and the rich-text engine is kept only as a guest for the focused block.
Using only a ms timestamp in a useSyncExternalStore snapshot drops re-renders on same-ms mutations — a monotonic revision is needed.