feat: load external config file

[yjl9903]

Clear and concise description of the problem

Vite supports using dotenv .env to pass some config into the application.

However, sometimes our config may be complex with various fields.

Now, unplugin-info supports pass some config with { meta: { ... } } to ~build/meta. But it does not support switch between different env (you must write some if-else or ? : code to support it) and modify vite.config.ts will cause server restart.

Suggested solution

Add another options { settings: '<config file>.{json|yml|...}' }, { settings: { dev: '...', production: '...', ... } }

Add another virtual module ~build/settings to get the content of config file.

For example:

# config.yml
field1: 111
field2: 222

// vite.config.ts

import Info from 'unplugin-info/vite';

export default defineConfig({
  plugins: [
    Info({ settings: 'config.yml' })
  ]
});

Finally, in your app:

import { field1, field2 } from '~build/settings'

Additional context

No response