Load yarn packages without reading their package files

.rubocop.yml

@@ -8,3 +8,6 @@ Rails:
 
 Gemspec/RequireMFA:
   Enabled: false
+
+Style/ClassAndModuleChildren:
+  Enabled: false

lib/cobra_commander.rb

@@ -13,7 +13,7 @@ module CobraCommander
 
   def self.umbrella(root_path, yarn: false, bundler: false, name: UMBRELLA_APP_NAME)
     umbrella = Umbrella.new(name, root_path)
-    umbrella.add_source(:yarn, Dependencies::YarnWorkspace.new(root_path)) unless bundler
+    umbrella.add_source(:yarn, Dependencies::Yarn.new(root_path)) unless bundler
     umbrella.add_source(:bundler, Dependencies::Bundler.new(root_path)) unless yarn
     umbrella
   end

lib/cobra_commander/dependencies.rb

@@ -1,4 +1,4 @@
 # frozen_string_literal: true
 
-require_relative "dependencies/yarn_workspace"
+require_relative "dependencies/yarn"
 require_relative "dependencies/bundler"

lib/cobra_commander/dependencies/yarn.rb

@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+require "json"
+require "open3"
+
+module CobraCommander
+  module Dependencies
+    # Yarn workspace components source for an umbrella
+    class Yarn
+      autoload :Package, "cobra_commander/dependencies/yarn/package"
+
+      def initialize(root_path)
+        @root_path = root_path
+      end
+
+      def path
+        @root_path
+      end
+
+      def dependencies
+        packages.map(&:name)
+      end
+
+      def components
+        @components ||= packages.map do |package|
+          {
+            path: package.path,
+            name: package.name,
+            dependencies: package.dependencies,
+          }
+        end
+      end
+
+    private
+
+      def packages
+        @packages ||= begin
+          output, = Open3.capture2("yarn workspaces --json info", chdir: @root_path)
+          JSON.parse(JSON.parse(output)["data"]).map do |name, spec|
+            Package.new(
+              File.join(@root_path, spec["location"]),
+              name, spec["workspaceDependencies"]
+            )
+          end
+        end
+      end
+    end
+  end
+end

lib/cobra_commander/dependencies/yarn/package.rb

@@ -1,37 +1,22 @@
 # frozen_string_literal: true
 
-require "json"
 require "pathname"
 
 module CobraCommander
   module Dependencies
-    module Yarn
-      # Represents an Yarn package.json file
-      class Package
-        attr_reader :path
+    class Yarn::Package
+      attr_reader :path, :name, :dependencies
 
-        def initialize(path)
-          @path = ::Pathname.new(File.join(path, "package.json")).realpath
-        end
-
-        def project_tag
-          name.match(%r{^@[\w-]+/}).to_s
-        end
-
-        def name
-          json["name"]
-        end
-
-        def dependencies
-          json.fetch("dependencies", {})
-              .merge(json.fetch("devDependencies", {}))
-        end
+      def initialize(path, name, dependencies)
+        @path = ::Pathname.new(File.join(path, "package.json")).realpath
+        @name = untag(name)
+        @dependencies = dependencies.map { |dep| untag(dep) }
+      end
 
-      private
+    private
 
-        def json
-          @json ||= JSON.parse(File.read(@path))
-        end
+      def untag(name)
+        name.gsub(%r{^@[\w-]+/}, "")
       end
     end
   end