use var for consistency

rollup-examples.config.js

-const path = require( 'path' );
-const fs = require( 'fs' );
+var path = require( 'path' );
+var fs = require( 'fs' );
 
 // Creates an rollup config object for the given file to
 // be output to umd format
 function createOutput( file ) {
 
-	const inputPath = path.resolve( file );
-	const outputPath = inputPath.replace( /[\\\/]examples[\\\/]jsm[\\\/]/, '/examples/js/' );
+	var inputPath = path.resolve( file );
+	var outputPath = inputPath.replace( /[\\\/]examples[\\\/]jsm[\\\/]/, '/examples/js/' );
 
 	// Every import is marked as external so the output is 1-to-1. We
 	// assume that that global object should be the THREE object so we
@@ -42,11 +42,11 @@ function createOutput( file ) {
 // the callback for every file.
 function walk( dir, cb ) {
 
-	const files = fs.readdirSync( dir );
+	var files = fs.readdirSync( dir );
 	files.forEach( f => {
 
-		const p = path.join( dir, f );
-		const stats = fs.statSync( p );
+		var p = path.join( dir, f );
+		var stats = fs.statSync( p );
 		if ( stats.isDirectory() ) {
 
 			walk( p, cb );
@@ -62,7 +62,7 @@ function walk( dir, cb ) {
 }
 
 // Gather up all the files
-const files = [];
+var files = [];
 walk( 'examples/jsm/', p => files.push( p ) );
 
 // Create a rollup config for each module.js file