vega-typings

What is vega-typings?

The vega-typings npm package provides TypeScript type definitions for Vega, a visualization grammar that allows for the creation, sharing, and exploration of a wide variety of data visualizations. These typings help developers ensure type safety and better development experience when working with Vega specifications in TypeScript.

What are vega-typings's main functionalities?

Vega Specification Typings

This feature provides type definitions for creating Vega specifications. The code sample demonstrates a simple bar chart specification using Vega.

{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "width": 400,
  "height": 200,
  "data": [
    {
      "name": "table",
      "values": [
        {"category": "A", "amount": 28},
        {"category": "B", "amount": 55},
        {"category": "C", "amount": 43}
      ]
    }
  ],
  "marks": [
    {
      "type": "rect",
      "from": {"data": "table"},
      "encode": {
        "enter": {
          "x": {"scale": "xscale", "field": "category"},
          "y": {"scale": "yscale", "field": "amount"},
          "width": {"scale": "xscale", "band": 1},
          "height": {"scale": "yscale", "band": 1}
        }
      }
    }
  ]
}

Signal Typings

This feature provides type definitions for signals in Vega. Signals are dynamic variables that can drive interactive behaviors. The code sample shows how to define a signal that updates on mouseover and mouseout events.

{
  "signals": [
    {
      "name": "hover",
      "value": {},
      "on": [
        {"events": "rect:mouseover", "update": "datum"},
        {"events": "rect:mouseout", "update": "{}"}
      ]
    }
  ]
}

Data Transform Typings

This feature provides type definitions for data transformations in Vega. The code sample demonstrates a simple filter transformation that filters out data points where the amount is less than or equal to 30.

{
  "data": [
    {
      "name": "table",
      "values": [
        {"category": "A", "amount": 28},
        {"category": "B", "amount": 55},
        {"category": "C", "amount": 43}
      ],
      "transform": [
        {
          "type": "filter",
          "expr": "datum.amount > 30"
        }
      ]
    }
  ]
}

Other packages similar to vega-typings

vega-lite

Vega-Lite is a high-level grammar of interactive graphics. It provides a concise JSON syntax for rapidly generating visualizations to support analysis. Compared to vega-typings, Vega-Lite is more focused on providing a simpler, more user-friendly way to create visualizations, while vega-typings provides type definitions for the more comprehensive Vega visualization grammar.

d3

D3.js is a JavaScript library for producing dynamic, interactive data visualizations in web browsers. It uses HTML, SVG, and CSS. Compared to vega-typings, D3 offers a lower-level approach to creating visualizations, giving developers more control over the rendering process but requiring more effort to achieve the same results.

plotly.js

Plotly.js is a high-level, declarative charting library built on D3 and stack.gl. It supports a wide range of chart types and is designed for ease of use. Compared to vega-typings, Plotly.js provides a more straightforward API for creating complex visualizations but may not offer the same level of customization and flexibility as Vega.

README

Vega-Typings

Typings for Vega.