page.mainImage() throws error 'Cannot read property 'imageinfo' of undefined' about wiki HOT 9 CLOSED

Fixed in v4.0.0

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Thanks for the reproducible error case. I will try to get to this fix soon.

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I wonder if FC København.svg being different than FC_K%C3%B8benhavn.svg is the issue. If you want, you can try changing the conditional of byNamedImage to use URL encoding for equality.

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I think the problem is when the lib tries to find the main image. For debugging purposes, I added some console.log to your byNamedImage function and found this mismatch (see the last two lines of the output) between name and searchName.

Modified Code:

const byNamedImage = searchName => image => {
	const [, name] = image.title.split(':');
	console.log(image);
	console.log("Name: " + name);
	console.log("searchName: " + searchName);

	return name === searchName;
};

Output:

{ pageid: 28199557,
  ns: 6,
  title: 'File:FC København.svg',
  imagerepository: 'local',
  imageinfo: 
   [ { url: 'https://upload.wikimedia.org/wikipedia/en/9/93/FC_K%C3%B8benhavn.svg',
       descriptionurl: 'https://en.wikipedia.org/wiki/File:FC_K%C3%B8benhavn.svg',
       descriptionshorturl: 'https://en.wikipedia.org/w/index.php?curid=28199557' } ] }
Name: FC København.svg
searchName: frameless|Logo
...

PS:

I didn't try the URL encoding yet

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Good debugging. Yep sure enough... The main image is being parsed wrong.

[[File:FC København.svg|frameless|Logo]] is parsed as frameless|Logo instead of File:FC København.svg

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Still having the same problem if with version 4.3.1.
(node:2016) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): TypeError: Cannot read prop erty 'imageinfo' of undefined

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Can you please provide more information, a code example please?

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@dijs yes I've created a new issue #62.

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Thanks, fixed.

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