transformToDefaultImport can be a function

Author: xurudan01

README.md

@@ -253,7 +253,40 @@ module.exports = function customName(name) {
 
 #### transformToDefaultImport
 
-Set this option to `false` if your module does not have a `default` export.
+Set this option to `false` if your module does not have a `default` export. 
+
+If `transformToDefaultImport` is a `Function`, your module will have a either `default` export or `named` export, depending on the function return value.
+
+```js
+import { PageHeader } from "custom"
+ReactDOM.render(
+  <PageHeader>xxxx</PageHeader>
+);
+
+      ↓ ↓ ↓ ↓ ↓ ↓
+
+var _page = require('custom/layout/page');
+ReactDOM.render(<_page.PageHeader>xxxx</_page.PageHeader>);
+```
+
+```js
+[
+  "import",
+    {
+      "libraryName": "custom",
+      "customName": (name: string) => {
+        if (name === 'PageHeader'){
+          return 'custom/layout/page';
+        }
+        return `custom/${name}`;
+      },
+      "transformToDefaultImport": (name: string) => {
+        return name !== 'PageHeader';
+      },
+      "camel2DashComponentName": false
+    }
+]
+```
 
 ### Note
 

src/Plugin.js

@@ -21,6 +21,20 @@ function normalizeCustomName(originCustomName) {
   return originCustomName;
 }
 
+function resolveTransformToDefaultImport(transformToDefaultImport) {
+  const type = typeof transformToDefaultImport;
+
+  return function (transformedMethodName) {
+    if (type === 'undefined') {
+      return true;
+    }
+    if (type === 'boolean') {
+      return transformToDefaultImport;
+    }
+    return transformToDefaultImport(transformedMethodName);
+  };
+}
+
 export default class Plugin {
   constructor(
     libraryName,
@@ -49,9 +63,7 @@ export default class Plugin {
     this.customStyleName = normalizeCustomName(customStyleName);
     this.fileName = fileName || '';
     this.customName = normalizeCustomName(customName);
-    this.transformToDefaultImport = typeof transformToDefaultImport === 'undefined'
-      ? true
-      : transformToDefaultImport;
+    this.transformToDefaultImport = resolveTransformToDefaultImport(transformToDefaultImport);
     this.types = types;
     this.pluginStateKey = `importPluginState${index}`;
   }
@@ -75,7 +87,7 @@ export default class Plugin {
       const path = winPath(
         this.customName ? this.customName(transformedMethodName, file) : join(this.libraryName, libraryDirectory, transformedMethodName, this.fileName) // eslint-disable-line
       );
-      pluginState.selectedMethods[methodName] = this.transformToDefaultImport  // eslint-disable-line
+      pluginState.selectedMethods[methodName] = this.transformToDefaultImport(transformedMethodName)  // eslint-disable-line
         ? addDefault(file.path, path, { nameHint: methodName })
         : addNamed(file.path, methodName, path);
       if (this.customStyleName) {