[barrel] Use modern namespace re-export

[jasonkuhrt]

// codegen:start {preset: barrel, include: ./sources/index.ts, import: star }
import * as sources from './sources/index'

export { sources }
// codegen:end

Could be:

// codegen:start {preset: barrel, include: ./sources/index.ts, import: star }
export * as sources from './sources/index'
// codegen:end

[mmkal]

Makes sense - note that you can write a custom script which does this right now. I'm moving this to a new repo soon, I'll port this issue over when that happens.

[mmkal]

@jasonkuhrt the repo is now moved - would you like to create a PR for this?

[jasonkuhrt]

Hey, don't think I need this enough for the PR. But good to know you're open to it if ever!