BUG: JS compilation system has broken hack

```
nodejs.py
82 if 'es5' in out:
83 # TODO XXX obviously broken hack: Must fix by adding the
84 # "configure" step mechanism, that gets the absolute path to
85 # whichever programs/libs/whatever are necessary, and also what is
86 # supported
87 es2015_path = os.path.expanduser('~/.local/lib/node_modules'
88 '/babel-preset-es2015')
89 extra_args.extend(['--presets=%s' % es2015_path])
```

Start by reading the JavaScript compilation logic in nodejs.py around lines 82-89, including how the Babel preset path is currently assembled. Determine the configure-step mechanism described in the issue and define completion as removing the hard-coded ~/.local/lib/node_modules/babel-preset-es2015 dependency while locating required programs, libraries, and supported options through configuration.

Written by the indexing model from the issue text.