feat(index.js): resolve all promises to save a file with all the results

index.js

@@ -2,22 +2,24 @@
 var gutil = require('gulp-util');
 var through = require('through2');
 var fileUrl = require('file-url');
+var fs = require('fs-extra');
 var AxeBuilder = require('axe-webdriverjs');
 var WebDriver = require('selenium-webdriver');
 var Promise = require('promise');
 var reporter = require('./lib/reporter');
 var PLUGIN_NAME = 'gulp-axe-core';
 
 var promise;
+var promises = [];
 var url = '';
 var result;
 
 module.exports = function (customOptions) {
 
 	var createResults = function(cb) {
 		Promise.all(promises).then(function(results) {
-			if(options.createReportFile) {
-				fs.writeFileSync(dest, JSON.stringify(results, null, '  '));
+			if(options.saveOutputIn !== '') {
+				fs.writeFileSync(options.saveOutputIn, JSON.stringify(results, null, '  '), { encoding: 'utf8' });
 			}
 			result = reporter(results, options.threshold);
 			driver.quit().then(function() {
@@ -29,7 +31,7 @@ module.exports = function (customOptions) {
 	var defaultOptions = {
 		browser: 'firefox',
 		server: null,
-		createReportFile: false,
+		saveOutputIn: '',
 		threshold: 0
 	};
 
@@ -64,20 +66,14 @@ module.exports = function (customOptions) {
 					});
 			});
 
-			promise.then(function(results){
-				if(options.createReportFile) {
-					fs.writeFileSync(dest, JSON.stringify(results, null, '  '));
-				}
-				result = reporter(results, options.threshold);
-				driver.quit().then(function() {
-					cb(result);
-				});
-			}).catch(cb);
+			promises.push(promise);
 
 		} catch (err) {
 			this.emit('error', new gutil.PluginError(PLUGIN_NAME, err));
 		}
 
+		cb();
+
 	};
-	return through.obj(bufferContents);
+	return through.obj(bufferContents, createResults);
 };