Use Ctrl+j | ⌘+j to join lines, just like in Atom and similar to Sublime Text: the next line is joined to the current line, and all whitespace is replaced with a single space.

Launch VS Code Quick Open (Ctrl/Cmd+P), paste the following command, and press enter.

ext install join-lines

The Rules are:

• If nothing is selected, the current line is joined with the next, and the cursor position is moved to the end of the original line (minus whitespace)
• If text is selected, and it's all on one line, the current line is joined with the next, and the selection is retained
• If text is selected, and it spans multiple lines, the selected lines are joined, and the selection is retained (minus whitespace)

Multiple selections are also supported.

Create an issue, or ping @waynemaurer on Twitter.