ci: add error on ci for global packages

Author: claudiahdz

lib/ci.js

@@ -19,10 +19,13 @@ function cmd(cb) {
 }
 
 async function ci () {
-  const where = npm.flatOptions.global
-    ? globalTop
-    : npm.prefix
+  if (npm.flatOptions.global) {
+    const err = new Error('`npm ci` does not work for global packages')
+    err.code = 'ECIGLOBAL'
+    throw err
+  }
 
+  const where = npm.prefix
   const arb = new Arborist({ ...npm.flatOptions, path: where })
 
   try {