LayerChart Svelte 5 Skill

LayerChart Svelte 5

Docs: next.layerchart.com (NOT layerchart.com - that's Svelte 4)

Install

npm i layerchart@next d3-scale

CRITICAL: Use @next tag. Stable (1.x) is Svelte 4 only.

Quick Start

<Chart {data} x="date" y="value" tooltip={{ mode: 'bisect-x' }}>
	<Svg><Area class="fill-primary/20" /><Highlight points /></Svg>
	<Tooltip.Root>{#snippet children({ data })}{data.value}{/snippet}</Tooltip.Root>
</Chart>

Core Patterns

Tooltip: {#snippet children({ data })} - NOT let:data
Chart context: {#snippet children({ context })}
Gradient: {#snippet children({ gradient })}
Enable tooltip: tooltip={{ mode: 'band' | 'bisect-x' }}
Type data: {#snippet children({ data }: { data: MyType })}

Tooltip Modes

| Mode | Use Case | | ------------ | ---------------------- | | band | Bar charts (scaleBand) | | bisect-x | Time-series area/line | | quadtree-x | Area (nearest x) | | quadtree | Scatter plots |

References

full-patterns.md - Area, Bar, Pie, Calendar
tooltip-modes.md - All modes
graph-patterns.md - ForceGraph, zoom/pan

Agent Skills: LayerChart Svelte 5