webpack: Webpack fails silently when named import doesn't exist

I’m submitting a feature request Webpack version: 2.1.0-beta.21

Please tell us about your environment: Linux

Current behavior: When I try to import a named import, it fails silently if the name import does not exist. I wish webpack would fail loudly when it cannot find the import at build time

For example:

// file1.js
const var1 = 'var1'
export { var1 }

and

// file2.js
import { var2 } from './file1'
// at this point, var2 is undefined at runtime because it was never exported from file1.js

Desired behavior: Instead, I want it to fail at build time. Is there a webpack option or some other technique I can use to catch this error sooner?

• What is the motivation / use case for changing the behavior? This will catch typos at build time, and prevent a lot of headaches caused by undefined imports.
• Browser: [all ]
• Language: [ES6/7]