"Move to a new file" refactoring removes all blank lines from JS code

[raiskila]

Summary

For some reason, VS Code removes all blank lines from Javascript code when using the "Refactor..." –> "Move to a new file" feature.

Versions

• VSCode Version: 1.31.0-insider (1.31.0-insider)
• OS Version: macOS 10.14.2 (18C54)

Steps to Reproduce:

1. Create an empty directory
2. Open that directory in VS Code
3. Create a new file called index.js within that directory with, say, the following contents:

const abc = () => {
  const a = 10;
  
  return a;
};

abc();

4. Highlight the entirety of the abc function.
5. Select "Refactor..." from the command palette.
6. Select "Move to a new file"

Expected result:

Blank lines inside and between functions are preserved when moving the code to a new file.

Actual result:

Blank lines are stripped from the code when moving to a new file.

Does this issue occur when all extensions are disabled?

Yes, tried it with --disable-extensions and a brand new user data dir.

[mjbvz]

Thanks for the report.

We are already tracking this issue upstream: microsoft/TypeScript#27294