chore: add tests, gh actions and prettier config

test/project/foo/index.js

@@ -0,0 +1,9 @@
+/**
+ * Returns bar (exciting!)
+ * @returns {string}
+ */
+function foo() {
+  return 'bar'
+}
+
+module.exports = foo

test/project/foo/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "foo",
+  "version": "0.0.1",
+  "description": "Dummy package that should not be transformed",
+  "main": "index.js"
+}