1 files changed, 36 insertions, 0 deletions
diff --git a/lib/license/finder/ext/npm.rb b/lib/license/finder/ext/npm.rb
new file mode 100644
index 0000000..75c0855
--- /dev/null
+++ b/lib/license/finder/ext/npm.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+module LicenseFinder
+  class NPM
+    def current_packages
+      NpmPackage.packages_from_json(npm_json, detected_package_path)
+    end
+
+    def prepare_command
+      lockfile? ? 'npm ci' : 'npm install --no-save'
+    end
+
+    def possible_package_paths
+      [project_path.join('package.json')]
+    end
+
+    def prepare
+      Dir.chdir(project_path) do
+        shell.execute("#{prepare_command} --production")
+      end
+    end
+
+    private
+
+    def lockfile?
+      File.exist?(project_path.join('package-lock.json'))
+    end
+
+    def npm_json
+      stdout, _stderr, status = Dir.chdir(project_path) do
+        shell.execute("npm list --json --long --production")
+      end
+      status.success? ? JSON.parse(stdout) : {}
+    end
+  end
+end