Trying to render a PNG from the PDF file using the example.

Steps to reproduce:

1. mkdir pdf-test
2. npm init
3. npm install pdfjs-dist assert canvas
4. Copy pdf2png.js from the examples page to the working folder
5. Copy a random PDF to this folder, set path to it in pdf2png.js on line 54
6. node pdf2png.js

I'm getting the following output:

# PDF document loaded.
(node:13760) UnhandledPromiseRejectionWarning: AssertionError [ERR_ASSERTION]: Invalid canvas size
    at NodeCanvasFactory_create [as create] (D:\tests\pdf-test\pdf2png.js:23:5)
    at D:\tests\pdf-test\pdf2png.js:70:21

My system:

• Windows 10 x64
• Node v11.6.0
• npm v6.5.0-next.0

Surprisingly, if I clone the entire PDF.js repository and follow the instructions to build it from source, the script works fine and I get a correctly rendered PNG file.

What am I missing when installing a prebuilt version from NPM?