TypeError: reduce of empty array with no initial value

[ridgeworks]

TypeError: reduce of empty array with no initial value

generated using Chrome/OSX with mj3-demos-master/mj3-mml2html-global.html

with input:

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
<mtable></mtable>
</math>

This is the simplest case but others also fail in similar way, e.g.,:

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
	<mo>(</mo><mtable><mtr><mtd><mn>1</mn></mtd></mtr></mtable>
</math>

Full traceback:

TypeError: Reduce of empty array with no initial value
    at Array.reduce (<anonymous>)
    at s.computeBBox (mj3-mml2html-global.dist.js:1:192096)
    at s.e.getBBox (mj3-mml2html-global.dist.js:1:15975)
    at s.stretchChildren (mj3-mml2html-global.dist.js:1:171881)
    at new s (mj3-mml2html-global.dist.js:1:170829)
    at node.(anonymous function) (mj3-mml2html-global.dist.js:1:47178)
    at s.t.create (mj3-mml2html-global.dist.js:1:46975)
    at s.wrap (mj3-mml2html-global.dist.js:1:155364)
    at s.e.wrap (mj3-mml2html-global.dist.js:1:15509)
    at mj3-mml2html-global.dist.js:1:15163

[pkra]

Thanks for the report!

[ridgeworks]

No problem. While MathJax suits my current purpose, ideally I'd like to see a MathML to HTML translator (String -> String) that could be executed in a Web Worker, i.e., no DOM. Is this a usage scenario that mj3 (or some piece of it) would work for?

[ridgeworks]

Further testing on OSX shows this seems to only be a problem on Chrome (V62). Both Safari and Firefox (current versions) are fine.

[pkra]

FWIW, I saw it on both Chrome and Firefox on Linux.

[ridgeworks]

Yes; my bad. It happens everywhere. I'll leave the diagnosis to the experts.

[dpvc]

The issue74 branch resolves this issue.