@unocss/webpack configure file not functional

[whitemay]

it seems that config file do not work functional.
presets and shortcuts works fine, but themes not merged: no matter defined in config root or used in preset params.
my config file like below:

import presetMini from '@unocss/preset-mini'

module.exports = {
  presets: [
    presetMini(),
  ],
  shortcuts: [
    {
      'border-base': 'border border-gray-500_10',
      'center': 'flex justify-center items-center',
    },
  ],
  theme: {
    fontSize: {
      '3xl': ['0.75rem', '1rem']
    }
  }
}

[antfu]

We temporarily close this due to the lack of enough information.
Please provide a minimal reproduction to reopen the issue.
Thanks.

Why reproduction is required

[whitemay]

参见 https://github.com/whitemay/unocss-error-2.git