update

package/node_modules/bin-links/lib/get-node-modules.js

@@ -0,0 +1,19 @@
+// we know it's global and/or not top, so the path has to be
+// {prefix}/node_modules/{name}.  Can't rely on pkg.name, because
+// it might be installed as an alias.
+
+const { dirname, basename } = require('path')
+// this gets called a lot and can't change, so memoize it
+const memo = new Map()
+module.exports = path => {
+  if (memo.has(path)) {
+    return memo.get(path)
+  }
+
+  const scopeOrNm = dirname(path)
+  const nm = basename(scopeOrNm) === 'node_modules' ? scopeOrNm
+    : dirname(scopeOrNm)
+
+  memo.set(path, nm)
+  return nm
+}