lazynvm.sh

# lazyload nvm
# all props goes to http://broken-by.me/lazy-load-nvm/
# grabbed from reddit @ https://www.reddit.com/r/node/comments/4tg5jg/lazy_load_nvm_for_faster_shell_start/

lazynvm() {
  unset -f nvm node npm npx
  export NVM_DIR=~/.nvm
  [ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh" # This loads nvm
  if [ -f "$NVM_DIR/bash_completion" ]; then
    [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion" # This loads nvm bash_completion
  fi
}

nvm() {
  lazynvm 
  nvm $@
}
 
node() {
  lazynvm
  node $@
}
 
npm() {
  lazynvm
  npm $@
}

npx() {
  lazynvm
  npx $@
}

In zsh, I have a different setup in my ~/.zshrc that not only lazyloads nvm and node, but also any globally-installed package

# Add every binary that requires nvm, npm or node to run to an array of node globals
NODE_GLOBALS=(`find ~/.nvm/versions/node -maxdepth 3 -type l -wholename '*/bin/*' | xargs -n1 basename | sort | uniq`)
NODE_GLOBALS+=("node")
NODE_GLOBALS+=("nvm")

# Lazy-loading nvm + npm on node globals call
load_nvm () {
  export NVM_DIR=~/.nvm
  [ -s "$(brew --prefix nvm)/nvm.sh" ] && . "$(brew --prefix nvm)/nvm.sh"
}

# Making node global trigger the lazy loading
for cmd in "${NODE_GLOBALS[@]}"; do
  eval "${cmd}(){ unset -f ${NODE_GLOBALS}; load_nvm; ${cmd} \$@ }"
done

updated for CLI npx and bash completion

Thanks @christophemarois, I've been hunting for a solution like this one!

@christophemarois this is gold, thanks

Updated @christophemarois's script with npx, removed brew paths for nvm, added bash completion and updated the unset -f function call:

# Add every binary that requires nvm, npm or node to run to an array of node globals
NODE_GLOBALS=(`find ~/.nvm/versions/node -maxdepth 3 -type l -wholename '*/bin/*' | xargs -n1 basename | sort | uniq`)
NODE_GLOBALS+=("node")
NODE_GLOBALS+=("nvm")
NODE_GLOBALS+=("npx")

# Lazy-loading nvm + npm on node globals call
load_nvm () {
  export NVM_DIR=~/.nvm
  [ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh" # This loads nvm
  if [ -f "$NVM_DIR/bash_completion" ]; then
    [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion" # This loads nvm bash_completion
  fi
}

# Making node global trigger the lazy loading
for cmd in "${NODE_GLOBALS[@]}"; do
  eval "${cmd}(){ unset -f ${cmd} >/dev/null 2>&1; load_nvm; ${cmd} \$@; }"
done

Thanks for sharing!

I got this error with @christophemarois and @VincentN script:

bash: eval: line xx: syntax error: unexpected end of file

I changed

eval "${cmd}(){ unset -f ${NODE_GLOBALS} >/dev/null 2>&1; load_nvm; ${cmd} \$@ }"

to

eval "${cmd}(){ unset -f ${cmd} >/dev/null 2>&1; load_nvm; ${cmd} \$@; }"

Note the change of NODE_GLOBALS and the ; at the end.

@adriaanvanrossum, oops. Updated the script!

Unsetting NODE_GLOBALS still makes sense. My take (tested only in bash):

export NVM_DIR="$HOME/.nvm"
mapfile -t __NODE_GLOBALS < <(find "$NVM_DIR/versions/node/"*/bin/ -maxdepth 1 -mindepth 1 -type l -print0 | xargs --null -n1 basename | sort --unique)
__NODE_GLOBALS+=(node nvm)

# instead of using --no-use flag, load nvm lazily:
_load_nvm() {
    [ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
    [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion
}

for cmd in "${__NODE_GLOBALS[@]}"; do
    eval "function ${cmd}(){ unset -f ${__NODE_GLOBALS[*]}; _load_nvm; unset -f _load_nvm; ${cmd} \"\$@\"; }"
done
unset cmd __NODE_GLOBALS

@VincentN is this the approach I should take if I want it to be applied to nodemon, for example?
Because with the original lazynvm.sh when I try to run nodemon inside a project I get a "command not found" error

@laur89 I ran into this error while using your code snippet
command not found: mapfile

also I am not able to use yarn globals using any of the above snippets @VincentN @christophemarois please any suggestion

command not found: mapfile

This suggests you're not using bash, as mapfile is bash builtin. As I stated above, the snippet was only ever tested in bash.

@laur89 thanks for your snippet and reply. So I just used a combined script took some parts from yours and some from @christophemarois now this works with yarn globals and node version is same for projects using yarn as well.

export NVM_DIR="$HOME/.nvm"
#[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"  # This loads nvm
#[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion

NODE_GLOBALS=(`find ~/.nvm/versions/node -maxdepth 3 -type l -wholename '*/bin/*' | xargs -n1 basename | sort | uniq`)
NODE_GLOBALS+=(node nvm yarn)

_load_nvm() {
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion
}

for cmd in "${NODE_GLOBALS[@]}"; do
eval "function ${cmd}(){ unset -f ${NODE_GLOBALS[*]}; _load_nvm; unset -f _load_nvm; ${cmd} \$@; }"
done
unset cmd NODE_GLOBALS

export PATH="$PATH:$HOME/.yarn/bin"```