Storm-React-Diagram自定义链接Demo：TS转JS报错求助

Hey there, let's work through the problem you're hitting when converting your Storm-React-Diagram TypeScript code to JavaScript.

The Problem Breakdown #

You're trying to implement custom link functionality with Storm-React-Diagram. Your original TypeScript code works as expected, but when you translate it to JavaScript, you run into errors. Here's what you started with:

Original TypeScript Snippet:

import * as SRD from 'storm-react-diagrams';
// setup diagram engine
this.engine = new SRD.DiagramEngine();
this.engine.installDefaultFactories();
// const pathfinding = this.engine.getLinkFactories().getFactory<SRD.PathFindingLinkFactory>(SRD.PathFindingLinkFactory.NAME);

Your Converted JavaScript Attempt:

const pathfinding = this.engine.getLinkFactories().getFactory(PathFindingLinkFactory.NAME);

The Corrected JavaScript Code #

The main issues are missing namespace references and TypeScript-specific syntax that doesn't translate to JS. Here's the fix:

import * as SRD from 'storm-react-diagrams';

// Initialize the diagram engine
this.engine = new SRD.DiagramEngine();
this.engine.installDefaultFactories();

// Correctly retrieve the PathFindingLinkFactory
const pathfinding = this.engine.getLinkFactories().getFactory(SRD.PathFindingLinkFactory.NAME);

Why This Works #

1. Drop TypeScript Generics: The <SRD.PathFindingLinkFactory> part in your TS code is a type assertion, which JavaScript has no use for—just remove it entirely.
2. Add the SRD Namespace Prefix: In your JS attempt, you called PathFindingLinkFactory.NAME directly, but this object is nested under the SRD import namespace. Without the SRD. prefix, JavaScript can't locate the factory, resulting in a reference error.

Quick Note for CommonJS Environments #

If you're working in a CommonJS setup (like Node.js without ES module support), swap the import for a require statement:

const SRD = require('storm-react-diagrams');

Also double-check that you've properly installed the storm-react-diagrams package via npm or yarn—missing dependencies can also throw unexpected errors here.

内容的提问来源于stack exchange，提问作者learning