TanStack Table

Reference Repositories

• TanStack Table - Headless table state and row models
• Svelte - Svelte 5 component and reactivity model

Upstream Grounding

When TanStack Table adapter APIs, row models, controlled state, sorting, filtering, pagination, or Svelte rendering helpers affect correctness, ask DeepWiki a narrow question against TanStack/table. Verify against the installed @tanstack/svelte-table and @tanstack/table-core versions.

This skill is for UI table state. Use yjs for Epicenter store table storage, and svelte for reading rows into a component.

Local API Baseline

Epicenter currently uses @tanstack/svelte-table with:

import {
	createTable as createSvelteTable,
	FlexRender,
	renderComponent,
} from '@tanstack/svelte-table';
import type { ColumnDef } from '@tanstack/table-core';

Table Construction Rules

• Always set getRowId for persisted or local-first rows. Do not rely on array index identity.
• Keep data referentially stable. Avoid creating a fresh array in the table options getter unless the table is intentionally rebuilt.
• Define columns with satisfies ColumnDef<Row>[].
• Give accessor columns stable ids, especially when sorting, hiding, or persisted preferences are involved.
• Use renderComponent for reusable header and cell components.
• Include only row models the UI uses: core always, sorted/filter/pagination only when the surface needs them.

Controlled State

• Control only state Epicenter owns externally, such as sorting, global filter, column visibility, row selection, or pagination.
• If an onXChange handler is present, the matching state.get x() must also be present.
• Keep state ownership in one component or handle. Do not split sorting, filters, and pagination across unrelated stores without a reason.

Rendering

• TanStack Table owns row, column, and cell state. @epicenter/ui/table owns semantic table markup and styling.
• Render headers and cells with FlexRender.
• Key rows by row.id and cells by cell.id.
• Empty states stay in ui-design: when row count is zero, render Empty.Root in the table body or surrounding panel.
• Add explicit keyboard behavior for clickable rows. A click handler alone is not a row interaction model.
• Use TanStack Virtual separately for large lists. Do not treat virtualization as a built-in table feature.