Install ESLint and cleanup tests.

Author: bardiharborow

.eslintrc

@@ -0,0 +1,8 @@
+{
+  "env": {
+    "es6": true,
+    "jest": true,
+    "node": true
+  },
+  "extends": "eslint:recommended"
+}

lib/__tests__/index.js

@@ -1,23 +1,44 @@
-const babel = require('@babel/core')
-const plugin = require('../index.js')
+const babel = require('@babel/core');
+const plugin = require('../index.js');
 
 const options = {
   presets: [
-    ["@babel/env", {
-      "modules": false
+    ['@babel/env', {
+      modules: false
     }]
   ],
   plugins: [
     plugin
   ]
-}
+};
 
 it('Module imports are stripped', () => {
-  var example = `
-    import fs from 'fs'
-    import path from 'path'
-  `
-
-  const {code} = babel.transform(example, options)
-  expect(code.length).toBe(0)
-})
+  const example = `
+    import path from 'path';
+  `;
+
+  const { code } = babel.transformSync(example, options);
+  expect(code.length).toBe(0);
+});
+
+it('Module exports are stripped', () => {
+  const example = `
+    export default 42;
+  `;
+
+  const { code } = babel.transformSync(example, options);
+  expect(code.length).toBe(0);
+});
+
+it('Other code is retained', () => {
+  const example = `
+    import path from 'path';
+
+    console.log(path.sep);
+
+    export default 42;
+  `;
+
+  const { code } = babel.transformSync(example, options);
+  expect(code).toBe('console.log(path.sep);');
+});