SyntaxError: Unexpected token '||='

Question

I need to build nextjs project with PDFViewer using @react-pdf-viewer, but when collecting page there are some error SyntaxError: Unexpected token '||='.

The problem is occured from pdf.js in node_modules, I try to change ||= to || in pdf.js, and build no error.

But I need to deploy in hosting and need to download pdf.js from yarn install, some code that I change before will be restored.

How can I solve it?

Answer 1

This is great example how to correctly setup react-pdf with NextJS.

However, as mentioned in comments, you still get SyntaxError: Unexpected token '||=' with a node version below 15, so you need to upgrade to >=15.0.

Then it works as expected.