Gulp babel not transpiling to es5

I installed gulp babel (and dependencies) and when running gulp, same es6 code is being output in dist. I tried adding .babelrc to specify preset as well as specifying preset in gulp.

Is there anything I am missing?

gulpfile
```
var gulp = require('gulp');
var babel = require('gulp-babel');

gulp.task( 'customJS', function() {
gulp.src( [ jsCustomSRC ] )
.pipe( concat( jsCustomFile + '.js' ) )
.pipe(babel({
presets: ['@babel/env']
}))
.pipe( gulp.dest( jsDestination ) )
});
```

.babelrc
```
{
"presets": ["@babel/env"]
}
```

package.json
```
"devDependencies": {
"@babel/core": "^7.1.5",
"@babel/preset-env": "^7.1.5",
"gulp": "^4.0.0",
"gulp-babel": "^8.0.0",
"gulp-concat": "^2.5.2"
}
```

Start with the gulpfile, .babelrc, and package.json shown in the report, then review the issue discussion for the reported setup and diagnosis. Reproduce the Gulp task and inspect the generated files in dist. Done means the configured source is transpiled to ES5 without breaking the existing concatenation workflow.

Written by the indexing model from the issue text.