Banora Svelte

Optional native Svelte 5 adapter for the Banora 0.1 SDK. Install with npm install @0disoft/banora @0disoft/banora-svelte. Build locally with bun run build:adapters from the repository root. A Svelte-aware compiler/bundler consumes the packaged .svelte components.

ControlledBoard accepts a required plain state and optional onIntent, with common display/input props and borrowed onView bindings. It never creates a record controller; the host supplies accepted snapshots and owns rules/records. See the host-controlled guide.

<script lang="ts">
import {RecordController} from '@0disoft/banora';
import {Board, Viewer, createRecordStore} from '@0disoft/banora-svelte';
const controller = new RecordController({sgf: '(;SZ[9];B[aa])'});
const record = createRecordStore(controller);
</script>
<p>Move {$record.position.moveNumber}</p>
<Board {controller} readOnly={true} />
<Viewer {controller} onStateChange={snapshot => console.log(snapshot.dirty)} />

Board accepts SDK board options; Viewer accepts viewer options except initial sgf. Both accept class, CSS text style, ariaLabel and onStateChange(state). createRecordStore(controller) is a Svelte readable store of immutable snapshots; subscriptions are released when the last consumer unsubscribes. For replaceable controllers use $state.raw and $derived(createRecordStore(controller)).

Configuration changes retain record state; controller replacement remounts the view. Unmount releases listeners/subscriptions and preserves a host controller. Without a supplied controller each component owns its own record and disposes it on unmount. Dispose host controllers after their views are gone. The framework owns the container; the SDK owns its descendants. SSR emits only containers/state text, with board DOM created in client effects. Supply matching record content for state hydration; rendered board HTML hydration is deferred.

Native components and declarations are packaged with @sveltejs/package 3.x and checked by svelte-check 4.x using isolated TypeScript 6.x. This does not downgrade the SDK/root TypeScript 7.x toolchain. See the repository's SDK API, compatibility document and Svelte consumer example for tested versions and limitations.

onView(viewOrNull) supplies a borrowed BoardView/ViewerView handle for exportSvg(options) or asynchronous exportPng(options). Cleanup clears it with null, including callback replacement. Keep handles raw, configure through props and leave disposal to the component. Image export does not save the SGF record or clear dirty state.

drawing={{color:'#206650',width:0.08}} enables the common freehand tool on Board; use nested board options on Viewer. Null disables it. Immutable store snapshots include strokes; the controller owns add/remove/clear, Undo and SGF export/reopen. Read-only views display saved ink, and diagrams include it. SGF uses Banora's private BPN extension, which other viewers may not display.

touch={{mode:'confirm',magnifier:true}} enables magnified touch aiming with confirmation on Board; use nested board.touch on Viewer. Release mode places on lift; null restores direct activation. Pending targets stay in the view, support keyboard refinement and cancel on configuration/context changes or unmount. They never enter SGF/diagrams. Ink takes priority; read-only views do not enter touch aiming.

Compose two Board components with nodeId, compareTo and referenceGeneration (the snapshot's recordGeneration) for side-by-side comparisons. Pins display their own node/path without navigating/editing the shared controller. Missing/stale pins become unavailable and cannot export until restored/rebound. Viewer follows its cursor and accepts board.compareTo. The Svelte example demonstrates pinning, configuration updates, controller ownership and remounts.