🛠 add config for wallaby

wallaby.js

@@ -0,0 +1,28 @@
+module.exports = function (wallaby) {
+  return {
+    files: [
+      'tests/mocks/*.js',
+      'src/**/*.js'
+    ],
+    tests: [
+      'tests/**/*spec.js'
+    ],
+    env: {
+      type: 'node',
+      runner: 'node'
+    },
+    testFramework: 'jest',
+    bootstrap: function (wallaby) {
+      wallaby.testFramework.configure({
+        "scriptPreprocessor": "<rootDir>/node_modules/babel-jest",
+        "moduleDirectories": [
+          "node_modules",
+          "src"
+        ]
+      });
+    },
+    compilers: {
+      '**/*.js': wallaby.compilers.babel()
+    }
+  };
+};