zsh/Functions/Zle/bash-backward-kill-word

# This implements a bash-style backward-kill-word.
# To use,
#   zle -N bash-backward-kill-word
#   bindkey '...' bash-backward-kill-word
# or if you wish to replace existing backward-kill-word bindings,
#   zle -N backward-kill-word bash-backward-kill-word

local WORDCHARS=''
zle .backward-kill-word