Definition of Angular 2 File

I have developed a custom Gantt chart library using D3 in vanilla JavaScript. Now, I am trying to integrate it into my Angular 2 application. After installing D3 via npm and adding the necessary type files and the Gantt chart module to node_modules, I encountered the following error:

__WEBPACK_IMPORTED_MODULE_4_d3__.gantt is not a function

I suspect that this error is due to incorrect export and definition file usage, but I am unsure how to resolve it.

Here are snippets of relevant code:

node_modules/d3/index.js:

export {version} from "./build/package";
export * from "d3-array";
.
.
.
export * from "d3-gantt";

node_modules/d3-gantt/index.js:

export default gantt;

function gantt()
{
    // implementation details
    return gantt
}

node_modules/@types/d3/index.d.ts:

export as namespace d3;
export * from 'd3-array';
.
.
.
export * from 'd3-gantt';

node_modules/@types/d3-gantt/index.d.ts:

export function gantt(): any;

src/app/AppComponent.ts

buildGantt(){
...
import * as d3 from 'd3'
d3.gantt().taskTypes(taskNames).taskStatus(taskStatus).selector('#d3Chart') //here i get the error
...
}

Answer №1

  • To get started, create a new javascript folder within the app directory
  • Next, move your d3-gantt folder into this new javascript folder
  • Along with your regular code, add an index.d.ts file with the following line: export function gantt(): any;
  • In your app.components.ts file, include this line of code:
    import { gantt } from "./javascript/d3-gantt";
  • Don't forget to set "allowJs":true, in your tsconfig.json file

This method worked perfectly for me!

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