deps: add babel env config

babel.config.js

@@ -0,0 +1,48 @@
+const parserOpts = {
+    // Allow returns in the module
+    allowReturnOutsideFunction: true
+};
+
+const node = {
+    presets: [
+        [
+            '@babel/preset-env',
+            {
+                targets: {
+                    node: true
+                }
+            }
+        ]
+    ],
+    plugins: [
+        '@babel/plugin-transform-flow-strip-types',
+        [
+            '@babel/plugin-proposal-decorators',
+            {
+                legacy: true
+            }
+        ]
+    ]
+};
+
+const all = {
+    presets: ['@babel/preset-env'],
+    plugins: node.plugins
+};
+
+const es5 = {
+    presets: all.presets
+};
+
+module.exports = (api) => {
+    api.cache(true);
+
+    return {
+        parserOpts,
+        env: {
+            node,
+            all,
+            es5
+        }
+    };
+};