webpack-config is the shared webpack config for noms.
To use without changing the default configuration - fine for most purposes - just run webpack like:
node_modules/.bin/webpack --config node_modules/@attic/webpack-config/index.js ...
webpack-config can also be configured (see configure in index.js), then required as part of a different webpack config, like:
// my.webpack.config.js
module.exports = require('@attic/webpack-config').configure({
requiredEnvVars: ['MY_ENV_VARIABLE']
});