When you first start a freshly-scaffolded app, the following warning flashes:

Warning: The 'no-use-before-declare' rule requires type infomation.

This is because --project is not being specified to tslint. It has the implication that any rules that require type information are disabled. In the ejected app's webpack config, adding

options: {
  typeCheck: true,
  tsConfigFile: paths.appTsConfig,
}

to the ts-loader config fixes it.