Recreate the Gulp.js @babel/register issue

recreate

#!/bin/bash

working_dir='gulp-babel-register-namespace-issue-scratchpad';

mkdir -p "$working_dir";
cd "$working_dir";

cat << EOF >> package.json
{
  "name": "gulp-babel-register-namespace-issue-scratchpad",
  "version": "0.0.1",
  "description": "An example repository showing the current issue with using @babel/register with gulp",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "license": "UNLICENSED",
  "devDependencies": {
    "@babel/preset-es2015": "^7.0.0-beta.53",
    "@babel/register": "^7.0.0",
    "gulp": "^4.0.0"
  }
}
EOF

cat << EOF >> .babelrc
{
  "presets": [ "es2015" ]
}
EOF

cat << EOF >> gulpfile.babel.js
export default function build() {
  return Promise.resolve();
}
EOF

npm install;