Added Node packages script

Necessary to provide a single source of truth for installing Node
dependencies. This used to be managed by the Yarn Setup project but
that project is being deprecated in favor of this project.

bin/install_node_packages

@@ -0,0 +1,17 @@
+#! /usr/bin/env bash
+
+# Installs Node packages.
+
+set -o nounset
+set -o errexit
+set -o pipefail
+IFS=$'\n\t'
+
+SCRIPT_PATH="$MAC_OS_CONFIG_PATH/bin/install_node_packages"
+
+if [[ -x "$SCRIPT_PATH" ]]; then
+  check_yarn_install
+  "$SCRIPT_PATH"
+else
+  printf "WARNING: Node packages install script does not exist or is not executable.\n"
+fi

bin/run

@@ -39,6 +39,7 @@ while true; do
     printf "     m:  Install Mac App Store software.\n"
     printf "     a:  Install application software.\n"
     printf "     x:  Install application software extensions.\n"
+    printf "    np:  Install Node packages.\n"
     printf "    rg:  Install Ruby gems.\n"
     printf "    rc:  Install Rust crates.\n"
     printf "     d:  Apply default settings.\n"

lib/options.sh

@@ -22,6 +22,8 @@ process_option() {
       bin/install_applications;;
     'x')
       bin/install_extensions;;
+    'np')
+      bin/install_node_packages;;
     'rg')
       bin/install_ruby_gems;;
     'rc')
@@ -39,6 +41,7 @@ process_option() {
       bin/install_app_store
       bin/install_applications
       bin/install_extensions
+      bin/install_node_packages
       bin/install_ruby_gems
       bin/install_rust_crates
       bin/apply_default_settings
@@ -53,6 +56,7 @@ process_option() {
       verify_app_store_applications
       verify_applications
       verify_extensions
+      verify_node_packages
       verify_ruby_gems
       verify_rust_crates;;
     'C')

lib/utilities.sh

@@ -101,6 +101,16 @@ get_install_root() {
 }
 export -f get_install_root
 
+# Checks Yarn has been installed and exits if otherwise.
+# Parameters: None.
+check_yarn_install() {
+  if ! command -v yarn > /dev/null; then
+    printf "%s\n" "ERROR: Yarn can't be found. Please ensure Homebrew and Yarn have been installed."
+    exit 1
+  fi
+}
+export -f check_yarn_install
+
 # Checks Mac App Store (mas) CLI has been installed and exits if otherwise.
 # Parameters: None.
 check_mas_install() {

lib/verifiers.sh

@@ -127,6 +127,23 @@ verify_path() {
 }
 export -f verify_path
 
+# Checks for missing Node packages.
+verify_node_packages() {
+  local packages=$(yarn global list --json | grep '"type":"info"')
+
+  printf "\nChecking Node packages...\n"
+
+  while read line; do
+    if [[ "$line" == "yarn global add"* ]]; then
+      local package=$(printf "$line" | awk '{print $4}')
+      verify_listed_application "$package" "${packages[*]}"
+    fi
+  done < "$MAC_OS_CONFIG_PATH/bin/install_node_packages"
+
+  printf "Node packages check complete.\n"
+}
+export -f verify_node_packages
+
 # Checks for missing Ruby gems.
 verify_ruby_gems() {
   local gems="$(gem list --no-versions)"