style: fix code style

src/utilities/writeIndex.js

@@ -1,23 +1,23 @@
-import _ from 'lodash';
-import createIndexCode from './createIndexCode';
 import fs from 'fs';
 import path from 'path';
+import _ from 'lodash';
+import createIndexCode from './createIndexCode';
 import validateTargetDirectory from './validateTargetDirectory';
 import readDirectory from './readDirectory';
 import sortByDepth from './sortByDepth';
 
 export default (directoryPaths) => {
-    const sortedDirectoryPaths = sortByDepth(directoryPaths);
+  const sortedDirectoryPaths = sortByDepth(directoryPaths);
 
-    _.forEach(sortedDirectoryPaths, (directoryPath) => {
-        validateTargetDirectory(directoryPath);
-    });
+  _.forEach(sortedDirectoryPaths, (directoryPath) => {
+    validateTargetDirectory(directoryPath);
+  });
 
-    _.forEach(sortedDirectoryPaths, (directoryPath) => {
-        const siblings = readDirectory(directoryPath);
-        const indexCode = createIndexCode(siblings);
-        const indexFilePath = path.resolve(directoryPath, 'index.js');
+  _.forEach(sortedDirectoryPaths, (directoryPath) => {
+    const siblings = readDirectory(directoryPath);
+    const indexCode = createIndexCode(siblings);
+    const indexFilePath = path.resolve(directoryPath, 'index.js');
 
-        fs.writeFileSync(indexFilePath, indexCode);
-    });
+    fs.writeFileSync(indexFilePath, indexCode);
+  });
 };