How can I convert tabs to spaces and vice versa in an existing file

I cannot figure out how to do this for the life of me apart from doing a find-replace on 4 spaces and converting to tabs (Version 0.10.2). I can't think of an editor/IDE that doesn't have a specific feature to do this. Does VSCode?

Since fix of: https://github.com/Microsoft/vscode/issues/1228 the editor supports it out of the box. Simply go for:

1. F1,
2. indentationToSpaces or indentationToTabs (depending on your need)
3. Enter.

Another way to do it is click the current indentation (Tab/Spaces:n) on the footer which will open your indentation options where you can select what you want to do.

If you are trying to convert non-leading tabs to spaces (or vice versa) you can use a regex search and replace.

1. Press CTRL + H
2. Click the .* button to search using regular expressions.
3. To search for tabs enter [\t] in Find box.
4. Enter spaces in Replace box and perform your replace.

Search box in regex mode: