diff --git a/.eslintrc.json b/.eslintrc.json
index a32eb0a2e..15341b5db 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,6 +1,8 @@
 {
   "parserOptions": {
-    "ecmaVersion": 6
+    "ecmaVersion": 6,
+    "sourceType": "module",
+    "allowImportExportEverywhere": true
   },
   "plugins": ["jest"],
   "env": {
@@ -12,10 +14,7 @@
     "Buffer": true,
     "escape": true
   },
-  "extends": [
-    "eslint:recommended",
-    "plugin:jest/recommended"
-  ],
+  "extends": ["eslint:recommended", "plugin:jest/recommended"],
   "rules": {
     "no-console": 0,
     "no-unused-vars": 1,
diff --git a/lib/utils/combineJSON.js b/lib/utils/combineJSON.js
index d1d2e4c15..714fa9792 100644
--- a/lib/utils/combineJSON.js
+++ b/lib/utils/combineJSON.js
@@ -11,18 +11,18 @@
  * and limitations under the License.
  */
 
-require('json5/lib/register');
+require("json5/lib/register");
 require.extensions[".jsonc"] = require("./jsonc").register;
 
-var { globSync }= require('glob'),
-  deepExtend = require('./deepExtend'),
-  path = require('path'),
-  fs = require('fs');
+var { globSync } = require("glob"),
+  deepExtend = require("./deepExtend"),
+  path = require("path"),
+  fs = require("fs");
 
 function traverseObj(obj, fn) {
   for (let key in obj) {
     fn.apply(null, [obj, key, obj[key]]);
-    if (obj[key] && typeof obj[key] === 'object') {
+    if (obj[key] && typeof obj[key] === "object") {
       traverseObj(obj[key], fn);
     }
   }
@@ -39,13 +39,14 @@ function traverseObj(obj, fn) {
  * @param {Object[]} [parsers=[]] - Custom file parsers
  * @returns {Object}
  */
-function combineJSON(arr, deep, collision, source, parsers=[]) {
-  var i, files = [],
+function combineJSON(arr, deep, collision, source, parsers = []) {
+  var i,
+    files = [],
     to_ret = {};
 
   for (i = 0; i < arr.length; i++) {
     // Reverse to avoid introducing a breaking change
-    var new_files = globSync(arr[i], {}).reverse();
+    var new_files = globSync(arr[i], { posix: true }).reverse();
     files = files.concat(new_files);
   }
 
@@ -62,11 +63,11 @@ function combineJSON(arr, deep, collision, source, parsers=[]) {
 
       // Iterate over custom parsers, if the file path matches the parser's
       // pattern regex, use it's parse function to generate the object
-      parsers.forEach(({pattern, parse}) => {
+      parsers.forEach(({ pattern, parse }) => {
         if (resolvedPath.match(pattern)) {
           file_content = parse({
-            contents: fs.readFileSync(resolvedPath, {encoding:'UTF-8'}),
-            filePath: resolvedPath
+            contents: fs.readFileSync(resolvedPath, { encoding: "UTF-8" }),
+            filePath: resolvedPath,
           });
         }
       });
@@ -76,13 +77,13 @@ function combineJSON(arr, deep, collision, source, parsers=[]) {
         file_content = deepExtend([file_content, require(resolvedPath)]);
       }
     } catch (e) {
-      e.message = 'Failed to load or parse JSON or JS Object: ' + e.message;
+      e.message = "Failed to load or parse JSON or JS Object: " + e.message;
       throw e;
     }
 
     // Add some side data on each property to make filtering easier
     traverseObj(file_content, (obj) => {
-      if (obj.hasOwnProperty('value') && !obj.filePath) {
+      if (obj.hasOwnProperty("value") && !obj.filePath) {
         obj.filePath = filePath;
 
         obj.isSource = source || source === undefined ? true : false;