How to set configuration for different modes?

[q962]

https://cn.vitejs.dev/guide/env-and-mode

It didn't explain this

To make it work properly, I changed as following

export default defineConfig(({ command, mode, isSsrBuild, isPreview }) => {
  void command, mode, isSsrBuild, isPreview

  const modes: {
    [key: string]: UserConfig
  } = {
    mode1: {
      ....
    }
  }

  return Object.assign(
    {
        ...
    },
    modes[mode]
  )
}

[sapphi-red]

It's written here: https://cn.vitejs.dev/config/#conditional-config

[q962]

Ok, I would have thought there was a solution for variable substitution