Troubleshooting issues with TypeScript D3 v4 module import functionality

As I embark on the journey of creating a miniature JS library using D3 to visualize line charts, I find myself navigating unfamiliar waters. However, I believe that deep diving into this project is the most effective way for me to learn.

Below is the content of my package.json

{
  "name": "d3play02",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "d3-array": "^1.0.1",
    "d3-axis": "^1.0.3",
    "d3-request": "^1.0.2",
    "d3-scale": "^1.0.3",
    "d3-selection": "^1.0.2",
    "d3-shape": "^1.0.3",
    "d3-time-format": "^2.0.2",
    "rollup": "^0.36.3",
    "rollup-plugin-node-resolve": "^2.0.0",
    "uglify-js": "^2.7.4"
  },
  "dependencies": {
    "@types/d3": "^4.2.37"
  }
}

In my file named LineChart.ts, I have included:

/// <reference path="node_modules/@types/d3/node_modules/@types/d3-request/index.d.ts" />
import csv from 'd3-request';

class LineChart {
    data(url: string): DsvRequest {
        // code to go here
    }
}

However, I encountered an error indicating that it cannot locate the d3-request module, despite having it installed and following what I believed to be the correct import procedure!

https://i.sstatic.net/o333a.png

javascriptd3.jstypescripttypescript-typings

Answer №1

For a successful installation of npm packages related to d3, follow these steps:

If you plan to utilize only specific modules, make sure to install both the module itself and its corresponding definition file.

For instance, execute: npm install d3-array --save and 

npm install @types/d3-array --save
. The d3-array module will serve as a proper dependency (not a devDependency as shown in your snippet). The @types definitions can be added using --save or --save-dev based on your requirements (for a library used by other code, inclining towards a proper dependency is recommended).

Once you intend to employ D3 modules with a module loader, introduce them using standard TypeScript syntax like this:

import * as  d3Array from 'd3-array';
import {select, Selection} from 'd3-selection';

Alternatively, adapt for your specific needs.

In order to simplify access, you may create a basic "bundling" module that consolidates your custom bundle:

// d3-bundle.ts
export * from 'd3-array';
export * from 'd3-axis';
...
export * from 'd3-time-format';

This module can be customized as per your requirements, allowing you to selectively re-export members of individual modules using export {...} from 'd3-MODULE';

To use D3 in any desired module, import 'd3-bundle' using an appropriate relative path, granting access to the bundle barrel contents:

// use-d3.ts
import { csv, DsvRequest } from './d3-bundle'; // adjust the relative path according to your project

class LineChart {
  data(url: string): DsvRequest {
      // implementation details here
  }
}

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