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Each day group renders as a `<section>` whose React key was the exact `createdAt` of its first message. Scrolling up prepends older messages, and when a batch landed on a calendar day already on screen, the first message of that day changed — flipping the section key. React can't diff a changed key, so it unmounted and remounted the entire day section, all its rows torn down and rebuilt above the reader's eye. That whole-section remount is the residual flicker on scroll-up: the anchor restore was correcting a full teardown instead of a clean prepend. Key the section by the local start-of-day of its messages, which is stable across same-day prepends, so an older message grows an existing section's children (stably-keyed rows reorder, not remount) instead of replacing the section. Fold the duplicate key derivation in the render loop into the lib boundary's `key`, which was already documented as "stable" but wasn't. Pure helper `startOfLocalDaySeconds` plus lib tests for day-key stability across a prepend and separation across calendar days. tsc, biome, 40 lib unit, scroll-history e2e 6/6 green. Co-authored-by: Tyler Longwell <tlongwell@squareup.com> Signed-off-by: Tyler Longwell <tlongwell@squareup.com>
Buzz
Desktop chat shell with:
- Tauri + React + TypeScript + Vite
- Tailwind CSS
- shadcn/ui-ready shared components
- Biome (lint/format/check)
- Feature-driven frontend structure
Scripts
pnpm dev- run the web frontendpnpm tauri dev- run the desktop apppnpm build- typecheck and build frontendpnpm typecheck- TypeScript checkspnpm lint- Biome lintpnpm format- Biome format (write)pnpm check- Biome check
Structure
src/shared- reusable app-wide code (ui,lib,styles)src/features- feature modules (vertical slices)src/app- top-level app composition