fix!: do not unwrap single-item arrays in --json output

BREAKING CHANGE: npm view --json now always returns an array.

Author: yetanotheraryan

lib/commands/view.js

@@ -240,18 +240,12 @@ class View extends BaseCommand {
     })
 
     if (json) {
-      // TODO(BREAKING_CHANGE): all unwrapping should be removed.
-      // Users should know based on their arguments if they can expect an array or an object.
-      // And this unwrapping can break that assumption.
-      // e.g. `npm view abbrev@^2` should always return an array, but currently since there is only one version matching `^2` this will return a single object instead.
+      // Users can expect an array .
       const first = Object.keys(res[0] || {})
       const jsonRes = first.length === 1 ? res.map(m => m[first[0]]) : res
       if (jsonRes.length === 0) {
         return
       }
-      if (jsonRes.length === 1) {
-        return jsonRes[0]
-      }
       return jsonRes
     }