Install latest Node.js LTS version and remove older versions. UNTESTED

update-node.sh

#!/usr/bin/env bash

# Install latest Node.js LTS version and remove older versions.
# UNTESTED

set -e

# Make sure NVM is available
export NVM_DIR="${NVM_DIR:-$HOME/.nvm}"

if [ ! -s "$NVM_DIR/nvm.sh" ]; then
    echo "Error: nvm is not installed."
    exit 1
fi

source "$NVM_DIR/nvm.sh"

echo "Installing latest Node.js LTS..."
nvm install --lts

# Get the installed LTS version
LTS_VERSION="$(nvm version --lts)"

echo "Setting Node.js $LTS_VERSION as default..."
nvm alias default "$LTS_VERSION"
nvm use "$LTS_VERSION"

echo
echo "Removing older Node.js versions..."

# Get all installed versions and remove everything except the LTS
nvm ls --no-colors | grep -E 'v[0-9]+\.[0-9]+\.[0-9]+' | \
    sed -E 's/.*(v[0-9]+\.[0-9]+\.[0-9]+).*/\1/' | \
    sort -Vu | \
    while read -r version; do
        if [ "$version" != "$LTS_VERSION" ]; then
            echo "Removing Node.js $version..."
            nvm uninstall "$version"
        fi
    done

echo
echo "Done!"
echo "Node.js: $(node -v)"
echo "npm:     $(npm -v)"
echo "Default: $(nvm version default)"