If you're looking for a simple solution, consider using npm to install the typescript compiler and then transforming the example into JavaScript.
I'm not sure how declaration files can be useful in this situation. In my experience, they mainly provide type interfaces for standard JavaScript code. However, I prefer to keep my project flexible across different IDEs.
As most developers are aware, Typescript compiles down to Javascript for execution. Essentially, Typescript minimizes development errors by enforcing a typing system and offers newer JavaScript features that can be compiled back to older versions.
Due to its design, all valid JavaScript code is also valid Typescript code. Once you have the sample as JavaScript, you can seamlessly integrate it with the plug-in.
To convert the Typescript example to JavaScript, simply install Typescript globally via Node Package Manager and run the compilation command in the terminal: tsc input.ts output.js.
You may need to add tsc to your system's PATH variable or directly reference the typescript compiler executable before executing the above command.
By exploring the www folder within the plugin's code, you can view the resulting JavaScript code after compilation. Keep in mind, understanding Typescript requires recognizing its typing syntax (typically denoted with a :) but overall, it's still legitimate JavaScript, often incorporating elements from ES6, ES7, and other modern JavaScript versions.