Why is /usr/bin/env node still needed?

I understand to make it clear this is only ment not for the browser, but I do not see it being used in other files, so why is this still needed? With tools like `webpack` the file is not recognized as a javascript file so it breaks the transpiling when using ES6 code.
pinojs · Mar 6, 2017 · 2d1d0fc · 2d1d0fc
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diff --git a/pretty.js b/pretty.js
@@ -1,5 +1,3 @@
-#! /usr/bin/env node
-
 'use strict'
 
 var split = require('split2')