[GitHub] TBBle commented on issue #6575: TypeError: Cannot set property 'font' of null at Object.measureText (node_modules/zrender/lib/contain/text.js:371:18)

[GitBox <gi...@apache.org>]

TBBle commented on issue #6575: TypeError: Cannot set property 'font' of null    at Object.measureText (node_modules/zrender/lib/contain/text.js:371:18)
URL: https://github.com/apache/incubator-echarts/issues/6575#issuecomment-386181504
 
 
   Turns out's hitting this:
   ```js
   notImplemented(
         "HTMLCanvasElement.prototype.getContext (without installing the canvas npm package)",
         this._ownerDocument._defaultView
       );
   ```
   
   See https://github.com/facebook/jest/issues/5168
   
   For some reason, the `notImplemented` failure doesn't bubble up or output anywhere, so this wasn't reported in the output logs.
   
   The solution is to install something like [canvas](http://npmjs.com/package/canvas), [canvas-prebuilt](https://www.npmjs.com/package/canvas-prebuilt) or [jest-canvas-mock](https://www.npmjs.com/package/jest-canvas-mock). That last option needs to be (simply) integrated into your project.

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