Enable async/await in jest tests

This changes the babel config to allow async/await in jest tests.

babel.config.js

@@ -2,7 +2,7 @@
 
 const BABEL_ENV = process.env.BABEL_ENV || process.env.NODE_ENV || null;
 
-const presets = [
+let presets = [
   [
     '@babel/preset-env',
     {
@@ -49,6 +49,17 @@ if (isJest) {
   https://gitlab.com/gitlab-org/gitlab-foss/issues/58390
   */
   plugins.push('babel-plugin-dynamic-import-node');
+
+  presets = [
+    [
+      '@babel/preset-env',
+      {
+        targets: {
+          node: 'current',
+        },
+      },
+    ],
+  ];
 }
 
 module.exports = { presets, plugins, sourceType: 'unambiguous' };

package.json

@@ -199,6 +199,7 @@
     "postcss": "^7.0.14",
     "prettier": "1.18.2",
     "readdir-enhanced": "^2.2.4",
+    "regenerator-runtime": "^0.13.5",
     "stylelint": "^10.1.0",
     "stylelint-config-recommended": "^2.2.0",
     "stylelint-scss": "^3.9.2",

yarn.lock

@@ -9647,6 +9647,11 @@ regenerate@^1.4.0:
   resolved "https://registry.yarnpkg.com/regenerate/-/regenerate-1.4.0.tgz#4a856ec4b56e4077c557589cae85e7a4c8869a11"
   integrity sha512-1G6jJVDWrt0rK99kBjvEtziZNCICAuvIPkSiUFIQxVP06RCVpq3dmDo2oi6ABpYaDYaTRr67BEhL8r1wgEZZKg==
 
+regenerator-runtime@^0.13.5:
+  version "0.13.5"
+  resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.13.5.tgz#d878a1d094b4306d10b9096484b33ebd55e26697"
+  integrity sha512-ZS5w8CpKFinUzOwW3c83oPeVXoNsrLsaCoLtJvAClH135j/R77RuymhiSErhm2lKcwSCIpmvIWSbDkIfAqKQlA==
+
 regenerator-transform@^0.14.0:
   version "0.14.1"
   resolved "https://registry.yarnpkg.com/regenerator-transform/-/regenerator-transform-0.14.1.tgz#3b2fce4e1ab7732c08f665dfdb314749c7ddd2fb"