@chestnutlabs/gcode-preview-svelte

Thin Svelte integration for the Chestnut Labs G-code viewer — a reactivity bridge over @chestnutlabs/gcode-preview-core with capability parity to the Vue and React adapters (same engine, same state model, same TypeScript contracts; DD-007 D1 amendment).

npm install @chestnutlabs/gcode-preview-svelte three
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(three is a peerDependency of the renderer, supported range ^0.178.0 — npm ≥ 7 installs it automatically; pnpm/yarn users add it explicitly. See the support policy.)

Ready-to-use component

<script>
  import GcodePreview from '@chestnutlabs/gcode-preview-svelte/GcodePreview.svelte';
  let file = null;
</script>

<div style="height: 70vh">
  <GcodePreview source={file} on:ready={(e) => console.log(`${e.detail.segments} segments`)} />
</div>
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That is a complete viewer. The component ships as a raw .svelte file (standard Svelte library packaging — your bundler's svelte plugin compiles it via the svelte export condition). Full defaulted prop surface: source, parseOptions, buildVolume (consumer-wins bed precedence), quality, colorMode, layerRange, scrub, showTravel, progress (DD-006 observation), createWorker. Events: ready, parseerror, parsecancelled, parseprogress, buildcomplete, qualityfallback, machinegeometrymismatch/discovered, progresspresentationchanged, disclosure, error. The full handle is exported as preview (bind:this then .preview).

Store/action API (build your own controls)

<script>
  import { createGcodePreview } from '@chestnutlabs/gcode-preview-svelte';
  import { onDestroy } from 'svelte';

  const preview = createGcodePreview();
  onDestroy(() => preview.dispose());
  // $state store: const state = preview.state;  →  {$state.summary?.segments}
  // await preview.parse(bytes); preview.controls.setScrubPosition(n);
  // preview.observeProgress(obs); preview.raw.renderer()
</script>

<canvas use:preview.canvas style="width: 100%; height: 100%" />
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preview.state follows the Svelte store contract (immediate emission + every snapshot after), so $-prefix auto-subscription works. Headless (non-component) users call dispose() themselves.

Workers

Batteries default (all dialect adapters + .gcode.3mf) needs zero setup under Vite; pass createWorker for the slim build, custom adapters, other bundlers, or strict CSP — options are identical across all three framework adapters by design (see the Vue README for the shared worker documentation).

Example

tools/example-svelte in the repository is a complete Vite + Svelte app (corpus load, layer/scrub, simulated live progress) compiling the raw component through the export condition.