git clone https://github.com/wilzbach/msa
cd msa
npm install
...
node
>msa = require('msa');
TypeError: Cannot read property 'extend' of undefined
at Object.<anonymous> (/path/to/node_modules/msa/lib/views/canvas/CanvasSelection.js:15:2)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.require (module.js:497:17)
at require (internal/module.js:20:19)
at Object.<anonymous> (/path/to/node_modules/msa/lib/views/canvas/CanvasSeqBlock.js:15:24)
at Module._compile (module.js:570:32)
Running on RHEL6, Node v6.10.1