Only decaffeinate

.travis.yml

@@ -6,4 +6,6 @@ notifications:
     on_failure: change
 
 node_js:
-  - 8
+  - 14
+  - 12
+  - 10

appveyor.yml

@@ -1,7 +1,10 @@
-image: Visual Studio 2015
+image: Visual Studio 2017
 
 environment:
-  nodejs_version: "6"
+  nodejs_version:
+    - 10
+    - 12
+    - 14
 
 platform:
   - x86

babel.config.js

@@ -0,0 +1,20 @@
+let presets = [];
+
+let plugins = [
+  ["@babel/plugin-proposal-optional-chaining", { loose: false }],
+  ["@babel/plugin-proposal-nullish-coalescing-operator", { loose: false }],
+];
+
+if (process.env.BABEL_ENV === "development") {
+  plugins.push(...[
+    "@babel/plugin-transform-modules-commonjs",
+    "@babel/plugin-proposal-export-namespace-from",
+  ]);
+}
+
+module.exports = {
+  presets: presets,
+  plugins: plugins,
+  exclude: "node_modules/**",
+  sourceMap: true,
+};