Theme customizing not working

[stan-golembivsky]

After following steps from theme customizing article getting error

ValidationError: Invalid options object. Less Loader has been initialized using an options object that does not match the API schema. options has an unknown property 'modifyVars'. These properties are valid: object { lessOptions?, prependData?, appendData?, sourceMap?, implementation? }

found the solution by passing lessOptions to addLessLoader method

addLessLoader({
    lessOptions: {
      javascriptEnabled: true,
      modifyVars: {
        'overrideTheme': `true; @import "${ path.resolve(__dirname, './src/theme.less') }";`,
      }
    }
  })

As far as i understood it depends on the less-loader version. Please change this step in the docs with less-loader version mentioning.