Pull in class definitions from the index.js file within the node_modules directory

In my project, I have the package called "diagram-js" in the node_modules. The file

node_modules/diagram-js/lib/model/index.js
contains multiple class definitions as shown below:

/**
 * @namespace djs.model
 */

/**
 * @memberOf djs.model
 */

/**
 * The basic graphical representation
 *
 * @class
 *
 * @abstract
 */
export function Base() { ... }

I attempted to make these classes importable in my project with intellisense using the steps outlined below:

  1. Created a file called
    @types\diagram-js\lib\model\index.d.ts
  2. Used various syntaxes such as:
export module 'diagram-js/lib/model' { ... }
export namespace djs.model { ... }
export declare namespace djs.model { ... }

In all scenarios, the outermost block contained the class definitions like this:

  declare class Base {
    id: string;
    type: string;
    businessObject: any;
    label: Object;
    parent: Shape;
    labels: Array<Label>;
    outgoing: Array<Connection>;
    incoming: Array<Connection>;
  }

I also experimented with using declare module and within it declaring export class. This method worked for other files, but not for index.js, as intellisense could not identify those classes.

Currently, I am utilizing the namespace solution, however, the imports appear as

../../../../@types/diagram-js/lib/model
, which is not ideal. What would be the correct approach to expose these classes in my codebase and enable intellisense?

Answer №1

Simply adding the directory containing the index.d.ts file to the typeRoots property in the tsconfig was all that was needed. The approach for files with names other than index.js is distinct, which led to my initial confusion.

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