The Dynamic Duo: Typescript and d3

My app utilizes the d3 library with TypeScript code, and I have encountered an issue. To avoid compiler error TS2686, which occurs when d3 refers to a UMD global in a module file, I need to add the following line: import * as d3 from 'd3'; However, this results in emitting: require('d3'); in the JavaScript code. The problem is that the d3 library is located under the root of the web app in a directory named 'd3', not where it is being required in the JavaScript. Additionally, the d3 library is already loaded globally in our index.html, so there is no need for it to be included in the JavaScript. I am struggling to find a way to reference d3 in TypeScript without using the import statement.

typescriptd3.js

Answer №1

You have a couple of options to consider:

Option 1: Suppressing the warning

If you are using TypeScript 3.5 or later, you can utilize the --allowUmdGlobalAccess flag to access global definitions from module files. This means that you can use d3 as a global namespace without needing an import or require statement. Keep in mind that while this may work for your project, it might not be suitable for all contexts depending on your code structure and libraries being used.

Option 2: Declaring a global namespace

Prior to TypeScript 3.5, it was not possible to reference UMD type definitions as a global namespace within a module file without the --allowUmdGlobalAccess flag. Instead, a workaround involved manually declaring a global namespace within your project like so:

// global.d.ts
import * as _d3 from "d3";

declare global {
  const d3: typeof _d3;
}

By adding this declaration, you can refer to d3 in your modules without explicitly importing from "d3". Additionally, you will still benefit from proper type checking based on @types/d3.

This approach offers a more explicit solution tailored to your specific code setup, ensuring that only the necessary UMD modules are accessible globally.

Answer №2

For the specific scenario that op is facing, Aaron Beall's response provides a flawless solution. However, in a more general sense, if you are looking to incorporate TypeScript with D3 nowadays, utilizing DefinitelyTyped would be the recommended approach. Simply follow these steps:

npm install d3
npm install --save-dev @types/d3

Then proceed to:

import * as d3 from 'd3';

Similar to utilizing any other @types package.

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