Webpack alias resolution - not working

Hi there

What are the constraints around webpack module alias resolution? Mine are not being recognised by Webstorm's problem checking (it runs fine) and I don't know why.

My webpack config file (specified in Preferences-> Languages & Frameworks -> Javascript -> Webpack) appears to be getting parsed properly because i'm not getting the usual error message when it cannot.

the file specifies aliases in the usual way:

module.exports = ...

module.exports = ...
resolve: {
    alias: {
        AnAlias: path.resolve(__dirname, './somepath'),

However I am defining the module.exports as a function with args (maybe it can't parse this?) as in here:

module.exports = (env, argv) => {

Anyway, with this configuration webstorm can't resolve imports:

import SomeFile from 'AnAlias/somefile.js';

Any ideas? I'm pretty sure this used to work but I don't know when it stopped working.

Thanks vm in advance