config: only create config dir before write

This change fixes the bug that creates
unnecessary ./etc folder when calling npm
with the --prefix flag.

PR-URL: https://github.com/npm/npm/pull/20212
Credit: @buddydvd
Reviewed-By: @iarna
Fixes: #17322

1 files changed, 13 insertions, 8 deletions

diff --git a/lib/config.js b/lib/config.js
index a6862808f..0d4161d3b 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -10,6 +10,8 @@ var types = npmconf.defs.types
 var ini = require('ini')
 var editor = require('editor')
 var os = require('os')
+var path = require('path')
+var mkdirp = require('mkdirp')
 var umask = require('./utils/umask')
 var usage = require('./utils/usage')
 var output = require('./utils/output')
@@ -114,14 +116,17 @@ function edit (cb) {
       }, []))
         .concat([''])
         .join(os.EOL)
-      writeFileAtomic(
-        f,
-        data,
-        function (er) {
-          if (er) return cb(er)
-          editor(f, { editor: e }, noProgressTillDone(cb))
-        }
-      )
+      mkdirp(path.dirname(f), function (er) {
+        if (er) return cb(er)
+        writeFileAtomic(
+          f,
+          data,
+          function (er) {
+            if (er) return cb(er)
+            editor(f, { editor: e }, noProgressTillDone(cb))
+          }
+        )
+      })
     })
   })
 }