Exploring the application of UI extension with Typescript in Cytoscape.js

Is it possible to use Cytoscape UI extensions in Typescript? I am able to use the Layout extension, but when I try to implement other extensions like https://github.com/cytoscape/cytoscape.js-cxtmenu, I encounter issues as the function cy.cxtmenu( defaults ) is not part of the cytoscape interface. Is there a workaround for this?

Here is the code snippet from my index.ts file:

import cytoscape = require('cytoscape');
import contextMenus = require('cytoscape-cxtmenu');
cytoscape.use(contextMenus);

const cy = cytoscape({
    container: document.getElementById('cy'),
    ...
});
let defaults = {
     menuRadius: 100, 
     selector: 'node',
    //...
};

let menu = cy.cxtmenu( defaults );

I have added the following declaration to index.d.ts:

declare module 'cytoscape-cxtmenu' {
    const ext: cytoscape.Ext;
    export = ext;
}

However, during transpilation, I receive the following error in the console:

ERROR in [at-loader] ./src/index.ts:152:17
    TS2339: Property 'cxtmenu' does not exist on type 'Core'.

Answer №1

Did you know that Typescript is essentially a supersized version of Javascript? Any code that functions in Javascript will also function perfectly with Typescript.

The problem you're facing seems to stem from a lack of proper Typescript definitions for the particular Javascript library you're utilizing.

It appears that there are currently no typings available for this package on DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped). One solution could be to create these definitions yourself and submit a pull request. After they've been accepted and published, you can install them as an npm package like @types/cytoscape-cxtmenu (or include them as a file in your project until then).

Another option would be to import the library using 'any', such as:

const cxtmenu = require('cytoscape-cxtmenu');

This approach means that Typescript won't perform any type checking when interacting with that library.

Depending on how your typescript project is set up, you may need to take a different route, like:

// @ts-ignore
import * as cxtmenu from "cytoscape-cxtmenu";

Answer №2

Absolutely, TypeScript is a super-set of JavaScript, so you can definitely use it for everything that JavaScript can do.

Personally, I am utilizing an alternative context menu extension with Angular 8. To incorporate it, simply import it like this:

import * as contextMenus from 'cytoscape-context-menus';

Remember, if the library has dependencies on other JS or CSS files, make sure to include them in the angular.json file for proper functionality.

Answer №3

If you encounter an error with your Cytoscape instance, you can employ the as keyword to set the type to any, as demonstrated in this helpful answer. By using this approach, you should be able to bypass the error message. For example:

(cy as any).cxtmenu( defaults );

It's important to acknowledge that this method is considered a workaround. Setting the type to any undermines the advantages of Typescript and is generally not recommended, but at present, it seems to be the only viable solution.

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