oh-my-zsh/lib/nvm.zsh

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# get the node.js version
function nvm_prompt_info() {
[[ -f "$NVM_DIR/nvm.sh" ]] || return
local nvm_prompt
nvm_prompt=$(node -v 2>/dev/null)
[[ "${nvm_prompt}x" == "x" ]] && return
nvm_prompt=${nvm_prompt:1}
echo "${ZSH_THEME_NVM_PROMPT_PREFIX}${nvm_prompt}${ZSH_THEME_NVM_PROMPT_SUFFIX}"
}