How to delete backwards till whitespace in Insert mode?

Question

Hope you're doing well.

Input:

let firstDate = src[0][0]|.toString();
                         ^
                         cursor in Insert mode

Desired output:

let firstDate = |.toString();
                ^
              cursor in Insert mode

So deleting src[0][0]. Currently I always spam <C-w> (in this case 6 times).

I found a similar question with the solution being, in Normal mode, cT<space>. The problem is that after entering Normal mode, the cursor is here:

let firstDate = src[0][0].toString();
                        ^
                        cursor in Normal mode

The result after jkcT<space> (jk is my remap to escape Insert mode)

let firstDate = |].toString();
                ^
                cursor in Insert mode

It leaves the ] behind, which is not what I want.

Also, is there any way I can do so without leaving Insert mode? I rarely use <C-U> so any remapping is fine with me too. Remapping with <C-b> in Insert mode seems appropriate. I'm open to use any vim/neovim plugin as well.

I thought I found the solution in this SO solution but the solution still requires 6 <C-b> to delete till previous whitespace.

Thank you!

Answer 1

Ctrl+o (see :help i_CTRL-O) allows you to perform a single Normal mode command from Insert mode and automatically return to Insert mode after it is executed.

As Robert Smith suggested, I would propose <C-o>dT<Space>:

Ctrl+o d T Space

You can also use the B motion to move to the beginning of the current WORD, which is delimited by whitespace.

So:

Ctrl+o d B