Which @angular/* package(s) are relevant/related to the feature request?

core

Description

The new control flow migration is a marvellous bit of engineering, however the formatter has a troublesome side-effect of removing all newlines from the templates. It would be preferable were the migration formatter to take a more minimalistic approach to formatting, only adding newlines / whitespace where the control flow code is added to the html templates.

Proposed solution

Add a property to the control migration schema to preserve existing newlines when formatting. And naturally, the formatter should thus obey this.

Something like:

"preserveNewLines": {
      "type": "boolean",
      "description": "Preserve newlines when formatting",
      "x-prompt": "Should existing newlines be preserved when formatting?",
      "default": "false"
    }

Alternatives considered

There are other formatters such as prettier, which is too opinionated, or beautify-js does not yet support the new control flow syntax.