fix: Make it work with included files #35 from wmertens/patch-1

* Make it work with included files

My webpack config imports a few things and that seems to trigger the self-loading weirdness; with this patch everything works.

* Add test watch mode for ava tests

package.json

@@ -6,6 +6,7 @@
     "build": "babel src -d build",
     "dev": "watch 'npm run build' src/",
     "test": "npm run test:lint && npm run test:plugin",
+    "test:watch": "ava -w",
     "test:win": "ava",
     "test:lint": "eslint src/ test/",
     "test:plugin": "eslint src/ test/ && nyc --cache --reporter=text ava",

src/index.js

@@ -68,6 +68,11 @@ export default function({ types: t }) {
                 // Require the config
                 let conf = require(confPath);
 
+                // if the object is empty, we might be in a dependency of the config - bail without warning
+                if (!Object.keys(conf).length) {
+                    return;
+                }
+
                 // In the case the webpack config is an es6 config, we need to get the default
                 if (conf && conf.__esModule && conf.default) {
                     conf = conf.default;

test/empty-object.config.js

@@ -0,0 +1,4 @@
+// empty object, this happens while importing things in the webpack config
+// eslint-disable-next-line import/no-commonjs
+module.exports = {
+};

test/index.spec.js

@@ -100,6 +100,10 @@ test('should throw an error when there is no resolve config', t => {
     );
 });
 
+test('should ignore empty object', t => {
+    t.notThrows(() => transformFixture('basic/absolute.js', {config: 'empty-object.config.js'}));
+});
+
 test('works with webpack configs that export an array, instead of a single object (multicompile mode)', t => {
     const actual = transformFixture('multicompile/source.js', {config: './webpack.multicompile.js'});
     const expected = readFixture('multicompile/expected.js');

test/no-resolve.config.js

@@ -1 +1,6 @@
-module.exports = {};
+// incomplete webpack config
+module.exports = {
+	output: {
+
+	}
+};