fix: use fake path if filename is directory

Author: pooya parsa

create-require.js

@@ -1,7 +1,13 @@
 const nativeModule = require('module')
 const path = require('path')
+const fs = require('fs')
 
 function createRequire (filename) {
+  // If filename is dir, createRequire goes with parent directory, so we need fakepath
+  if (isDir(filename)) {
+    filename = path.join(filename, 'index.js')
+  }
+
   // Added in Node v12.2.0
   if (nativeModule.createRequire) {
     return nativeModule.createRequire(filename)
@@ -25,4 +31,14 @@ function _createRequire (filename) {
   return mod.exports
 }
 
+function isDir (path) {
+  try {
+    const stat = fs.lstatSync(path)
+    return stat.isDirectory()
+  } catch (e) {
+    // lstatSync throws an error if path doesn't exist
+    return false
+  }
+}
+
 module.exports = createRequire

test/test.js

@@ -2,7 +2,7 @@ const path = require('path')
 const t = require('tap')
 const createRequire = require('../create-require')
 
-const _require = createRequire(path.join(__dirname, 'some/index.js'))
+const _require = createRequire(path.join(__dirname, 'some'))
 const e = _require('./file')
 t.equal(e, 'someFile')
 t.end()