Made it easier to debug mistakes

src/createObjectExpression.js

@@ -29,7 +29,7 @@ const createObjectExpression = (t: BabelTypes, object: InputObjectType): ObjectE
     } else if (typeof value === 'boolean') {
       newValue = t.booleanLiteral(value);
     } else {
-      throw new TypeError('Unexpected type.');
+      throw new TypeError('Unexpected type: ' + typeof value);
     }
 
     properties.push(

src/getClassName.js

@@ -28,32 +28,32 @@ const getClassNameForNamespacedStyleName = (
 
   if (!moduleName) {
     if (handleMissingStyleName === 'throw') {
-      throw new Error('Invalid style name.');
+      throw new Error('Invalid style name: ' + styleName);
     } else if (handleMissingStyleName === 'warn') {
       // eslint-disable-next-line no-console
-      console.warn('Invalid style name.');
+      console.warn('Invalid style name: ' + styleName);
     } else {
       return null;
     }
   }
 
   if (!styleModuleImportMap[importName]) {
     if (handleMissingStyleName === 'throw') {
-      throw new Error('CSS module import does not exist.');
+      throw new Error('CSS module import does not exist: ' + importName);
     } else if (handleMissingStyleName === 'warn') {
       // eslint-disable-next-line no-console
-      console.warn('CSS module import does not exist.');
+      console.warn('CSS module import does not exist: ' + importName);
     } else {
       return null;
     }
   }
 
   if (!styleModuleImportMap[importName][moduleName]) {
     if (handleMissingStyleName === 'throw') {
-      throw new Error('CSS module does not exist.');
+      throw new Error('CSS module does not exist: ' + moduleName);
     } else if (handleMissingStyleName === 'warn') {
       // eslint-disable-next-line no-console
-      console.warn('CSS module does not exist.');
+      console.warn('CSS module does not exist: ' + moduleName);
     } else {
       return null;
     }
@@ -83,11 +83,13 @@ export default (styleNameValue: string, styleModuleImportMap: StyleModuleImportM
       }
 
       if (styleModuleImportMapKeys.length === 0) {
-        throw new Error('Cannot use styleName attribute without importing at least one stylesheet.');
+        throw new Error('Cannot use styleName attribute for style name \'' + styleName +
+          '\' without importing at least one stylesheet.');
       }
 
       if (styleModuleImportMapKeys.length > 1) {
-        throw new Error('Cannot use anonymous style name with more than one stylesheet import.');
+        throw new Error('Cannot use anonymous style name \'' + styleName +
+          '\' with more than one stylesheet import.');
       }
 
       const styleModuleMap: StyleModuleMapType = styleModuleImportMap[styleModuleImportMapKeys[0]];

src/replaceJsxExpressionContainer.js

@@ -81,7 +81,7 @@ export default (
         )
       ));
     } else {
-      throw new Error('Unexpected attribute value.');
+      throw new Error('Unexpected attribute value: ' + destinationAttribute.value);
     }
   } else {
     path.node.openingElement.attributes.push(jSXAttribute(

src/resolveStringLiteral.js

@@ -42,7 +42,7 @@ export default (
         stringLiteral(resolvedStyleName)
       );
     } else {
-      throw new Error('Unexpected attribute value.');
+      throw new Error('Unexpected attribute value:' + destinationAttribute.value);
     }
 
     path.node.openingElement.attributes.splice(path.node.openingElement.attributes.indexOf(sourceAttribute), 1);