Function markThreadVisited

apps/web/src/uiStateStore.ts:229–250

(state: UiState, threadId: string, visitedAt: string)

const debouncedPersistState = new Debouncer(persistState, { wait: 500 });

export function markThreadVisited(state: UiState, threadId: string, visitedAt: string): UiState {
  const visitedAtMs = Date.parse(visitedAt);
  if (!Number.isFinite(visitedAtMs)) {
    return state;
  }
  const previousVisitedAt = state.threadLastVisitedAtById[threadId];
  const previousVisitedAtMs = previousVisitedAt ? Date.parse(previousVisitedAt) : NaN;
  if (
    Number.isFinite(previousVisitedAtMs) &&
    Number.isFinite(visitedAtMs) &&
    previousVisitedAtMs >= visitedAtMs
  ) {
    return state;
  }
  return {
    ...state,
    threadLastVisitedAtById: {
      ...state.threadLastVisitedAtById,
      [threadId]: visitedAt,
    },
  };
}

export function markThreadUnread(
  state: UiState,