browserify doesn't include typeahead when it does its stuff

[dcoli]

When I build my app for production, using enableProdMode() and this:
npm run build && browserify -s main app/main.js > app/bundle.js
On load I get:

Error: (SystemJS) Unexpected value 'Typeahead' declared by the module 'AppModule'

This doesn't happen when I build it without browserify. Not very familiar with browserify, but it seems to be pruning a dependency on Typeahead, which I actually need.

In systemjs.config.js, the map section (npm points to node_modules):
'ng2-typeahead': 'npm:ng2-typeahead',
In the packages section:
'ng2-typeahead': { main: './index', defaultExtension: 'js' }
In dependencies in package.json:
"ng2-typeahead": "^1.2.0",
At the top of app.module.ts:
import { Typeahead } from 'ng2-typeahead';
In the @NgModule:
declarations: [ AppComponent, ContentDisplayComponent, EllipsisPipe, Typeahead ],
And in the subcomponent that actually uses it (which is probably overkill):
import { Typeahead } from 'ng2-typeahead';