Provided namedExports example (xterm) doesn't actually fix the problem

[martonlanga]

Migrating from webpack to snowpack and having troubles with using xterm. I'm receiving the following error:

Uncaught SyntaxError: The requested module '../../web_modules/xterm.js' does not provide an export named 'Terminal'

Adding the following, as written in the docs does not fix the issue:

// Example: add support for `import { Terminal } from 'xterm';`
"installOptions": {
  "namedExports": ["xterm"]
}

I could solve it by importing the module and type separately:

- import { Terminal } from 'xterm'
- const terminal = new Terminal()
+ import xterm from 'xterm'
+ import type { Terminal } from 'xterm'
+ const terminal: Terminal = new xterm.Terminal()

I'm fine with doing the above, but we should update the docs at least, since it's confusing.