xyflow/packages/svelte

Svelte Flow is a highly customizable component for building interactive graphs and node-based editors, built by the creators of React Flow. Svelte Flow is still alpha and currently under heavy development. The API is relatively stable but some things might change.

🚀 Getting Started | 📖 Documentation | 📺 Examples | ☎️ Discord

Key Features

• Easy to use: Seamless zooming and panning, single- and multi selection of graph elements and keyboard shortcuts are supported out of the box
• Customizable: Different node and edge types and support for custom nodes with multiple handles and custom edges
• Fast rendering: Only nodes that have changed are re-rendered
• Hooks and Utils: Hooks for handling nodes, edges and the viewport and graph helper functions
• Plugin Components: Background, MiniMap and Controls
• Reliable: Written in Typescript and tested with Playwright

Installation

The easiest way to get the latest version of Svelte Flow is to install it via npm, yarn or pnpm:

npm install @xyflow/svelte

Getting started

You only need a few lines to get a fully interactive (e.g. select and drag nodes or pan and zoom) flow. If you want to learn more, please refer to the learn section, the examples or the API reference.

<script lang="ts">
  import { writable } from 'svelte/store';
  import {
    SvelteFlow,
    Controls,
    Background,
    BackgroundVariant,
    MiniMap,
  } from '@xyflow/svelte';

  // you need to import the styles for Svelte Flow to work
  // if you just want to load the basic styleds, you can import '@xyflow/svelte/dist/base.css'
  import '@xyflow/svelte/dist/style.css'
  
  // We are using writables for the nodes and edges to sync them easily. When a user drags a node for example, Svelte Flow updates its position. This also makes it easier to update nodes in user land.
  const nodes = writable([
    {
      id: '1',
      type: 'input',
      data: { label: 'Input Node' },
      position: { x: 0, y: 0 }
    },
    {
      id: '2',
      type: 'custom',
      data: { label: 'Node' },
      position: { x: 0, y: 150 }
    }
  ]);

  // same for edges
  const edges = writable([
    {
      id: '1-2',
      type: 'default',
      source: '1',
      target: '2',
      label: 'Edge Text'
    }
  ]);
</script>

<SvelteFlow
  {nodes}
  {edges}
  fitView
  on:nodeclick={(event) => console.log('on node click', event)}
>
  <Controls />
  <Background variant={BackgroundVariant.Dots} />
  <MiniMap />
</SvelteFlow>

How to Contribute

Show us what you make: Drop it in into our Discord Server, tweet at us, or email us at info@xyflow.com

Community Participation: Ask and answer questions in our Discord Server or jump in on Github discussions.

Squash Bugs: We can’t catch them all. Check existing issues and discussions first, then create a new issue to tell us what’s up.

Financial Support: If you are an organization who wants to make sure Svelte Flow continues to be maintained, reach out to us at info@xyflow.com

And of course, we love Github stars ⭐

Development

If you want to check out the current version you need to run the following command from the root directory:

1. pnpm install - install dependencies
2. pnpm build - needs to be done once
3. pnpm dev - starts dev server

You can now access the examples under http://127.0.0.1:5173

Maintainers

Svelte Flow is maintained by the team behind xyflow. If you need help or want to talk to us about a collaboration, reach out through our contact form or by joining our Discord Server.

• Moritz Klack • Twitter • Github
• Christopher Möller • Twitter • Github

Any support you provide goes directly towards the development and maintenance of React Flow and Svelte Flow, allowing us to continue to operate as an independent company, working on what we think is best for our open-source libraries.

License

Svelte Flow is MIT licensed.