fix: handle unconfigured handleMissingStyleNameOption (#121)

Author: gajus

src/getClassName.js

@@ -63,17 +63,19 @@ type OptionsType = {|
   handleMissingStyleName: HandleMissingStyleNameOptionType
 |};
 
-export default (styleNameValue: string, styleModuleImportMap: StyleModuleImportMapType, options: OptionsType): string => {
+export default (styleNameValue: string, styleModuleImportMap: StyleModuleImportMapType, options?: OptionsType): string => {
   const styleModuleImportMapKeys = Object.keys(styleModuleImportMap);
 
+  const handleMissingStyleName = options && options.handleMissingStyleName;
+
   return styleNameValue
     .split(' ')
     .filter((styleName) => {
       return styleName;
     })
     .map((styleName) => {
       if (isNamespacedStyleName(styleName)) {
-        return getClassNameForNamespacedStyleName(styleName, styleModuleImportMap, options.handleMissingStyleName);
+        return getClassNameForNamespacedStyleName(styleName, styleModuleImportMap, handleMissingStyleName);
       }
 
       if (styleModuleImportMapKeys.length === 0) {
@@ -87,10 +89,10 @@ export default (styleNameValue: string, styleModuleImportMap: StyleModuleImportM
       const styleModuleMap: StyleModuleMapType = styleModuleImportMap[styleModuleImportMapKeys[0]];
 
       if (!styleModuleMap[styleName]) {
-        if (options.handleMissingStyleName === 'throw') {
+        if (handleMissingStyleName === 'throw') {
           throw new Error('Could not resolve the styleName \'' + styleName + '\'.');
         }
-        if (options.handleMissingStyleName === 'warn') {
+        if (handleMissingStyleName === 'warn') {
           // eslint-disable-next-line no-console
           console.warn('Could not resolve the styleName \'' + styleName + '\'.');
         }

src/index.js

@@ -187,12 +187,16 @@ export default ({
           return;
         }
 
+        const handleMissingStyleName = stats.opts && stats.opts.handleMissingStyleName || optionsDefaults.handleMissingStyleName;
+
         if (t.isStringLiteral(styleNameAttribute.value)) {
           resolveStringLiteral(
             path,
             filenameMap[filename].styleModuleImportMap,
             styleNameAttribute,
-            {handleMissingStyleName: stats.opts.handleMissingStyleName || optionsDefaults.handleMissingStyleName}
+            {
+              handleMissingStyleName
+            }
           );
 
           return;
@@ -208,7 +212,9 @@ export default ({
             styleNameAttribute,
             filenameMap[filename].importedHelperIndentifier,
             filenameMap[filename].styleModuleImportMapIdentifier,
-            {handleMissingStyleName: stats.opts.handleMissingStyleName || optionsDefaults.handleMissingStyleName}
+            {
+              handleMissingStyleName
+            }
           );
         }
       },