Quick example showing how to use pdf.js with reagent in CLJS. This isn't specific to reagent so any React wrapper will work as long as function components are supported. This could be rewritten to not use hooks too.
I adapted the basic Hello World Example directly from the pdf.js homepage.
I opted to use the CDN prebuilt distribution and not the npm package since that often seems to be several versions behind. It is also easier to deal with the "worker" pdf.js uses which is a pre-built .js file which would otherwise need to be copied manually from node_modules/pdfjs-dist.
git clone https://github.com/thheller/reagent-pdfjs.git
cd reagent-pdfjs
npm install
npx shadow-cljs watch demo
Wait for "Build completed." and open http://localhost:8400 in your Browser. You should see a "Hello World" pdf displayed.
This example shows how to use React useRef in combination with useEffect to interop with foreign DOM libraries that don't use the React/reagent rendering model. It applies to many other libraries (eg. d3) in the same way. Create a DOM node, add a ref and use that via within the useEffect callback. Sometimes it may be necessary to "clean up" after yourself in that hook. Couldn't find anything about that in the pdf.js docs, so I only added a log where you'd do it.