fix: npm config warn on workspaces

When a workspace/workspaces config option is defined, we should log a
warning message to be explicit about not supporting workspaces in the
context of the `npm config` command.

PR-URL: https://github.com/npm/cli/pull/2950
Credit: @ruyadorno
Close: #2950
Reviewed-by: @wraithgar

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/config.js b/lib/config.js
index 6bfde9845..f53d7e5ae 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -89,6 +89,7 @@ class Config extends BaseCommand {
   }
 
   execWorkspaces (args, filters, cb) {
+    this.npm.log.warn('config', 'This command does not support workspaces.')
     this.exec(args, cb)
   }