feat(conf): Adds support for webpack configurations exported as functions

.eslintignore

@@ -1,3 +1,3 @@
 test/fixtures/
 test/*.config.js
-test/*.config.babel.js
+test/*.config.babel.js

src/index.js

@@ -68,6 +68,11 @@ export default function({ types: t }) {
                 // Require the config
                 let conf = require(confPath);
 
+                // if the configuration expots a function, invoke it
+                if (typeof conf === 'function') {
+                    conf = conf();
+                }
+
                 // if the object is empty, we might be in a dependency of the config - bail without warning
                 if (!Object.keys(conf).length) {
                     return;

test/index.spec.js

@@ -105,7 +105,7 @@ test('should ignore empty object', t => {
 });
 
 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 actual = transformFixture('multicompile/source.js', {config: './webpack.multicompile.config.js'});
     const expected = readFixture('multicompile/expected.js');
     t.is(actual, expected);
 });
@@ -115,3 +115,9 @@ test('doesnt output extensions when noOutputExtension is set to true', t => {
     const expected = readFixture('no-extension/expected.js');
     t.is(actual, expected);
 });
+
+test('works with webpack configs that export function', t => {
+    const actual = transformFixture('basic/absolute.js', {config: './webpack.function.config.js'});
+    const expected = readFixture('basic/expected.js');
+    t.is(actual, expected);
+});

test/webpack.function.config.js

@@ -0,0 +1,13 @@
+
+var path = require('path');
+
+module.exports = function() {
+    return {
+        resolve: {
+            alias: {
+                'my-absolute-test-lib': path.join(__dirname, 'assets/le-test-lib'),
+                'same-folder-lib': path.resolve(__dirname, 'fixtures/basic')
+            }
+        }
+    };
+};

test/webpack.multicompile.js → test/webpack.multicompile.config.js

@@ -1,7 +1,6 @@
 
-var path = require('path'); // eslint-disable-line no-var, import/no-commonjs
+var path = require('path');
 
-// eslint-disable-next-line import/no-commonjs
 module.exports = [{
     resolve: {
         alias: {