require() autocompletion in repl incorrectly removes file extensions from folders

[not-an-aardvark]

• Version: 8.3.0
• Platform: macOS
• Subsystem: repl

If a folder name ends in .js, the autocomplete suggestion in the repl will incorrectly remove the extension from the folder name.

To reproduce:

1. mkdir foo_bar.js
2. touch foo_bar.js/index.js
3. node
4. In the repl, enter require('./foo_ and press Tab

The autocomplete suggestion is require('./foo_bar') rather than require('./foo_bar.js'). Since foo_bar is a folder, removing the .js extension results in an error when calling require.

(I originally noticed this because I have a local clone of Inquirer.js, which was cloned into a folder with a .js extension.)