Install IJavascript kernel

[rgbkrk]

The node.js notebook(s) needs the IJavascript kernel installed in our binder image. We need it added to our conda config. 😄

[rgbkrk]

It seems like we'd need to add node to the conda environment, then run npm install -g ijavascript (as well as another command). We can do this with a postBuild file.

[willingc]

Hey @rgbkrk, Can we use node 10? Or should we do 8?

In other news, I almost have music21 running on binder. An abjad/m21 combo would be sweet.

[rgbkrk]

Ooooh sweet! Either node 8 or node 10 is fine. We can lean on node 10 for maximal fun I think.

[rgbkrk]

In other news, I almost have music21 running on binder. An abjad/m21 combo would be sweet.

👀 @jefftrevino

[Miniland1333]

Hey all! I'm trying to run the immutable-revival.ipynb demo that you have but it says that the IJavascript kernel is not installed. Is creating a postBuild file still the best way to enable the IJavascript kernel?