You're right. The columnChart code is spread out in more than one file. You would have to get it's other peices and add them into one file for devtools to run it. Here is a gist of a custom visual that does work in the devtools: https://gist.githubusercontent.com/AndyCross/999842907fa92d0aff69/raw/14eeade8ab12cb245c69e66f930d5bf98348805d/infograph.ts
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