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Module `canvas` is only required if you need to run `vis.js` on `node.js` and require actual output. It is not required for regular usage in a browser.
Currently, the unit tests use a mock object for canvas which has limited but adequate functionality. If `canvas` is installed, that will be used silently in place of the mock object.
The issue with `canvas` is that it has an external dependency to `cairo`. This needs to be installed outside of the regular install as done by `npm`. Please consult [`node-canvas` github page](https://github.com/Automattic/node-canvas/wiki#desktop) for the correct installation procecure your platform
## Load
To use a component, include the javascript and css files of vis in your web page:
@ -332,9 +341,6 @@ module: {
There is also an [demo-project](https://github.com/mojoaxel/vis-webpack-demo) showing the integration of vis.js using webpack.
## Test
To test the library, install the project dependencies once: