d3-no-dom

Fully use d3.js in environments without DOM, such as Cloudflare Workers or Vercel Functions

Features

• Simple API with maximum extensibility.
• Support for asynchronous operations and API calls in render function
• Utilities like sanitizing the HTML or outputting the base64 from generated svg
• Tests covering most of the functionality ensuring robustness

Installation

npm i d3-no-dom d3 
# or
yarn add d3-no-dom d3 
# or
pnpm add d3-no-dom d3 

The d3-no-dom library does not provide any underlying DOM implementation, giving users the flexibility to choose their preferred DOM library. Some options are:

• linkedom: A lightweight and fast DOM implementation ideal for serverless environments such as Cloudflare Workers or Vercel Functions (recommended).

npm i linkedom 
# or
yarn add linkedom 
# or
pnpm add linkedom 

• jsdom: A more comprehensive and heavier DOM implementation, suitable for traditional backend environments like monolithic applications hosted on dedicated servers.

npm i jsdom 
# or
yarn add jsdom 
# or
pnpm add jsdom 

[!WARNING]
jsdom may not work on the Cloudflare Workers without specifying nodejs_compat flag due to use of the Node native modules

How to use

1. At first, you must supply your own d3 instance and dom provider to the d3-no-dom's prepreSvgServerSideRenderer

• using linkedom (recommended)

  import * as d3 from "d3"
  import { parseHTML } from "linkedom"
  
  // ...
  
  class Linkedom {
    window: { document: Document };
    constructor(html: string) {
      const { document, window } = parseHTML(html);
      this.window = { document };
      Object.assign(this.window, window);
    }
  }
  
  const { render } = prepareSvgServerSideRenderer({
    domProvider: Linkedom,
    d3Instance: d3
  });

• using jsdom

  import * as d3 from "d3"
  import { JSDOM } from "jsdom"
  
  // ...
  
  const { render } = prepareSvgServerSideRenderer({
    domProvider: JSDOM,
    d3Instance: d3
  });

2. Next, use the render function. It provides everything you need in order to fully use d3.js on the server side (the underlying mechanism is integration with Virtual DOM)

//               you can make e.g. API calls here   
//           it can also be synchronous if not needed!
//              ╭────────────┤
//              │            │    
//              ↓            ↓ 
const result = await render(async ({ d3Selection, svgNode, currentDom }) => {
//      ↑                                  ↑        ↑          ↑            
//      │                d3 selected       │        │          │
//      │                object to work on ╯        │          ╰ whole DOM  
//      │                                      underlying
//      ╰ rendered svg's                 svg DOM node to work on
//   source, as HTML or base64   
})

3. (Optionally) adjust your configuration or the render function's options directly in order to e.g. disable sanitizing the HTML or control the return value (whether it should be HTML or base64 - where second is specifically useful with usage with satori)

License & contributing

The MIT License. All contributions are welcome!