Importing anything from pdfjs-dist results in very slow LSP exchanges

[angrybacon]

Let me know if there exists a better place for this kind of issues

• node 22
• pdfjs-dist 4.6.82
• typescript 5.5.4
• typescript-language-server 4.3.3

I'm building a Next application using the above dependencies. The moment I comment my pdf.js usage typescript-language-server becomes usable again. The pdf.js usage is contained in this one file https://github.com/angrybacon/vntlnk/blob/master/modules/PoisonDartFrog/read.ts

How do I get to investigate further and see where exactly TypeScript is struggling? By unusable I mean that some LSP requests are very slow ie. 2-5 seconds and most end up timing out

[tamuratak]

I recommend adding "skipLibCheck": true to tsconfig.json.

• https://www.typescriptlang.org/tsconfig/#skipLibCheck

You can see "skipLibCheck": true is recommended in the reference.

I also recommend making "include" in tsconfig.json more specific. It would be better to avoid using **/*.ts.

• https://www.typescriptlang.org/tsconfig/#include

[angrybacon]

Missed that reply sorry. Thank you for the suggestions

It's not immediately clear but the tsconfig extends a common configuration file, where skipLibCheck is indeed true.

Can you give examples of what could go wrong with **/*.ts? As long as I'm excluding node_modules I can't think of a TypeScript files that I don't want to watch for 🤔 The Next.js application is using the app router and I'm not using a src folder so using such a loose pattern feels like a feature to me more than a danger

As for the slowness, I realized yesterday that my Vercel deployment was not supporting Node 22 yet and had to revert to Node 20 where I can't reproduce the slowness at all.