feat(chart): Create sankey chart

[BrendanDavies]

SankeyChart Component

Adds a new SankeyChart component for visualizing flow data between nodes using ECharts.

Features

• Node & link visualization - Displays flow relationships with customizable node colors and link opacity
• Value labels - Optional display of values above node labels with customizable formatting
• Rich tooltips - Default tooltips with support for custom tooltipFormatter for full control
• Link color modes - gradient (blends source/target colors) or gray (flat gray links)
• Click handlers - onNodeClick and onLinkClick for interactive drill-down behavior
• Dark mode support - Automatic color adjustments via isDarkMode prop

Documentation

• Basic usage examples
• Multi-level flow demo
• Rich tooltip customization
• Interactive click handling
• Drill-down filtering pattern (click to filter by source node)

Dependencies

• Requires echarts as a peer dependency (not bundled)

[stritt]

@BrendanDavies can you resolve conflicts here so we can test?

[pkg-pr-new]

npm i https://pkg.pr.new/@cloudflare/kumo@128

commit: e611b08

[github-actions]

Docs Preview

View docs preview

Commit: e611b08

[github-actions]

Visual Regression Report — 11 changed, 25 unchanged

11 screenshot(s) with visual changes:

Button / Sizes

477 px (0.47%) changed

Before	After	Diff

Button / Loading State

0 px (0%) changed

Before	After	Diff

Dialog / Dialog With Select

130 px (0.13%) changed

Before	After	Diff

Dialog / Dialog With Combobox

244 px (0.24%) changed

Before	After	Diff

Dialog / Dialog With Dropdown

244 px (0.24%) changed

Before	After	Diff

Select / Select Basic

300 px (0.3%) changed

Before	After	Diff

Select / Select Loading

0 px (0%) changed

Before	After	Diff

Select / Select Complex

1,144 px (0.97%) changed

Before	After	Diff

Select / Select Grouped

430 px (0.42%) changed

Before	After	Diff

Select / Select Long List

976 px (0.82%) changed

Before	After	Diff

Select (Open)

70 px (0%) changed

Before	After	Diff

25 screenshot(s) unchanged

• Button / Basic
• Button / Variant: Primary
• Button / Variant: Secondary
• Button / Variant: Ghost
• Button / Variant: Destructive
• Button / Variant: Outline
• Button / Variant: Secondary Destructive
• Button / With Icon
• Button / Icon Only
• Button / Disabled State
• Button / Title
• Dialog / Dialog With Actions
• Dialog / Dialog Basic
• Dialog / Dialog Alert
• Dialog / Dialog Confirmation
• Dialog (Open)
• Select / Select Without Label
• Select / Select With Field
• Select / Select Placeholder
• Select / Select With Tooltip
• Select / Select Custom Rendering
• Select / Select Multiple
• Select / Select Disabled Options
• Select / Select Disabled Items
• Select / Select Grouped With Disabled

---

Generated by Kumo Visual Regression

[stritt]

/bonk review code

[ask-bonk]

@stritt Bonk workflow was cancelled.

View workflow run · To retry, trigger Bonk again.

[BrendanDavies]

/bonk review code