Specifying a path to a file in modules_directories makes it match with any module name

[ento]

1. Clone this gist. Its jetpack.json is set up like so (note that vendor.js is a file:

  "modules_directories": [
    "./",
    "./vendor.js"
  ],

2. Follow the README and run jetpack as specified.

Expected: fail with: I had troubles finding "non-existent-module".

Actual: var module = require('non-existent-module') gets compiled as:

var module = jetpackRequire(vendor_js_js, "vendor_js_js")

I guess it's from

jetpack/src/Resolver.hs

Line 103 in 0424c9f

<|> moduleExistsInBase "" require

(but probably the fix is to exit early if modules_directories contain a path pointing at a file)