Svelte v8-to-v9 migration checklist

Before starting, run intent load @tanstack/table-core#migrate-v8-to-v9. Audit its entire shared checklist and read the detailed core mappings for APIs present in the application. This checklist adds the Svelte-specific changes.

Framework prerequisite: Svelte 5 (svelte ^5.0.0); migrate Svelte 3/4 components before Table.

Adapter audit

• Upgrade to Svelte 5 and replace old writable-store table setup with runes/getters.
• Replace createSvelteTable with createTable; preserve changing data and controlled slices through getters.
• Configure explicit features/row-model slots and complete the shared core checklist.
• Remove creation selectors, selected table.state, subscribeTable, and SubscribeSource from earlier v9 code.
• Update SvelteTable to two generic parameters and AppSvelteTable to five; remove selected-state generics from useTableContext.
• Read atoms/store in templates or tracked runes. Use per-slice updater callbacks, createTableState, or external Svelte Store atoms instead of global onStateChange.
• Render with FlexRender, renderComponent, or renderSnippet. Use the shipped rune-aware createTableHook only for repeated conventions.

Load the affected details

When the audit finds old Svelte construction, state, rendering, or app-hook code, read adapter migration details before editing it. For a replacement render scaffold, read getting started. For controlled or stale state after migration, read table state.

Shared pinning, sizing, sorting, selection, prototype-method, type, and registry changes stay in the core migration references. Renaming createSvelteTable alone does not complete the migration.

Verify the migration

• Type-check against the installed v9 adapter and exercise every enabled client/manual feature flow.
• Verify external state writes, reactive data replacement, and the framework rendering paths changed above.
• Complete the core checklist, including layout and selection behavior when those features are used.
• Replace temporary stockFeatures when the target is explicit feature tree-shaking.

API discovery

Inspect node_modules/@tanstack/svelte-table/dist/index.d.ts and the exported adapter declarations. Use node_modules/@tanstack/table-core/dist/index.d.ts for shared APIs.